| 1. |
- Ahmad, Iftikhar, et al.
(författare)
-
Fake News Detection Using Machine Learning Ensemble Methods
- 2020
-
Ingår i: Complexity. - : WILEY-HINDAWI. - 1076-2787 .- 1099-0526. ; 2020
-
Tidskriftsartikel (refereegranskat)abstract
- The advent of the World Wide Web and the rapid adoption of social media platforms (such as Facebook and Twitter) paved the way for information dissemination that has never been witnessed in the human history before. With the current usage of social media platforms, consumers are creating and sharing more information than ever before, some of which are misleading with no relevance to reality. Automated classification of a text article as misinformation or disinformation is a challenging task. Even an expert in a particular domain has to explore multiple aspects before giving a verdict on the truthfulness of an article. In this work, we propose to use machine learning ensemble approach for automated classification of news articles. Our study explores different textual properties that can be used to distinguish fake contents from real. By using those properties, we train a combination of different machine learning algorithms using various ensemble methods and evaluate their performance on 4 real world datasets. Experimental evaluation confirms the superior performance of our proposed ensemble learner approach in comparison to individual learners.
|
|
| 2. |
- Akbar, Nabeela, et al.
(författare)
-
Tunning tin-based perovskite as an electrolyte for semiconductor protonic fuel cells
- 2022
-
Ingår i: International journal of hydrogen energy. - : Elsevier BV. - 0360-3199 .- 1879-3487. ; 47:8, s. 5531-5540
-
Tidskriftsartikel (refereegranskat)abstract
- The use of ceramic semiconductors to serve as an efficient proton conductor is an evolving approach in the novel emerging field of semiconductor protonic fuel cells (SPFCs). One of the most critical challenges in SPFCs is to design a sufficient proton-conductivity of 0.1 S cm(-1) below <600 degrees C. Here we report to tune the perovskite BaSnO3 (BSO), a semi-conductor single-phase material, to be applied as a proton-conducting electrolyte for SPFC. It was found that the oxygen vacancies play a vital role to promote proton transport while the electronic short-circuiting issue of BSO semiconductor has been justified by the Schottky junction mechanism at the anode/electrolyte interface. We have demonstrated a SPFC device to deliver a maximum power density of 843 mW cm(-2) with an ionic conductivity of 0.23 S cm(-1) for BSO at 550 degrees C. The oxygen vacancy formation by increasing the annealing temperature helps to understand the proton transport mechanism in BSO and such novel low-temperature SPFC (LT-SPFC).
|
|
| 3. |
- Ahmad, Iftikhar, et al.
(författare)
-
Optimizing Pretrained Convolutional Neural Networks for Tomato Leaf Disease Detection
- 2020
-
Ingår i: Complexity. - : Hindawi Publishing Corporation. - 1076-2787 .- 1099-0526. ; 2020
-
Tidskriftsartikel (refereegranskat)abstract
- Vegetable and fruit plants facilitate around 7.5 billion people around the globe, playing a crucial role in sustaining life on the planet. The rapid increase in the use of chemicals such as fungicides and bactericides to curtail plant diseases is causing negative effects on the agro-ecosystem. The high scale prevalence of diseases in crops affects the production quantity and quality. Solving the problem of early identification/diagnosis of diseases by exploiting a quick and consistent reliable method will benefit the farmers. In this context, our research work focuses on classification and identification of tomato leaf diseases using convolutional neural network (CNN) techniques. We consider four CNN architectures, namely, VGG-16, VGG-19, ResNet, and Inception V3, and use feature extraction and parameter-tuning to identify and classify tomato leaf diseases. We test the underlying models on two datasets, a laboratory-based dataset and self-collected data from the field. We observe that all architectures perform better on the laboratory-based dataset than on field-based data, with performance on various metrics showing variance in the range 10%–15%. Inception V3 is identified as the best performing algorithm on both datasets.
|
|
| 4. |
- Hashim, Ahmed, et al.
(författare)
-
Pattern of novel psychoactive substance use among patients presented to the poison control centre of Ain Shams University Hospitals, Egypt : A cross-sectional study
- 2022
-
Ingår i: Heliyon. - : Elsevier BV. - 2405-8440. ; 8:8
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Novel psychoactive substances (NPSs) are relatively new substances in the illicit drug market, notpreviously listed in the United Nations Office on Drugs and Crime (UNDOC). Strox and Voodoo are consideredsome of the most popular blends of NPS in the Egyptian drug market.Objectives: The current study was conducted to assess NPS's use pattern: Voodoo and Strox among acutelyintoxicated patients presented to the poison control center of Ain Shams University Hospitals (PCC- ASUH).Methods: A single center based cross-sectional study was carried out in the PCC-ASUH among acutely intoxicatedpatients presenting to the emergency department (ED) over four months (from January–April 2019. using apreviously adopted and validated Fahmy and El-Sherbini socioeconomic scale (SES). Data were presented asmean, median and range as appropriate. Both smoking and crowding indexes were calculated and presented aspreviously reported.Results: Fifty-one patients were presented to the ED of PCC-ASUH during the study period. A total of 96.1% (n ¼49) were males. The mean age was 25 7.5 years. The most common NPS used was Strox: 54.9% (n ¼ 28),followed by Voodoo: 27.4% (n ¼ 14). Neurological and gastrointestinal (GI) symptoms were the most frequentpresentations. The most common motive behind NPS use was the desire to give a trial of new psychoactivesubstances. The mean SES score was 35.1 13.17. Most patients have the preparatory as the highest education36.0% (n ¼ 18).Conclusions: NPS use is common among young males in preparatory education from different social classes,starting it most commonly as a means to experiencing a new high. Neurological and GI manifestations are themost common presenting symptoms of NPS intoxication.
|
|
| 5. |
- Hassan, Mohsan, et al.
(författare)
-
Effects of Cu–Ag hybrid nanoparticles on the momentum and thermal boundary layer flow over the wedge
- 2019
-
Ingår i: Proceedings of the Institution of mechanical engineers. Part E, journal of process mechanical engineering. - : Sage Publications. - 0954-4089 .- 2041-3009. ; 233:5, s. 1128-1136
-
Tidskriftsartikel (refereegranskat)abstract
- In this work, the effects of hybrid nanoparticles on the momentum and thermal boundary layers as well as flow characteristics and thermal performance of the hybrid nanofluid are investigated over the wedge. The fluid in the enclosure is water containing hybrid nanoparticles Cu–Ag. The physical model of homogenous hybrid nanofluid is derived using the elementary equations of thermo-hydrodynamic and co-relation's model of a mixture that supports the effective physical features. The results are calculated to measure the effects of nanoparticle concentration on thermal and momentum boundary layers and displayed in graphs for discussions. In addition, the effects of nanoparticles concentration and different compositions of hybrid nanoparticles on temperature and velocity profiles, physical properties, skin friction, and convective heat transfer coefficient are deliberated through graphs and tables. To check its heat transfer performance, a comparison of hybrid nanofluid is made between the base fluid and single material nanofluids. It is found that the efficiency of hybrid nanofluids as a heat transfer fluid is much more than conventional fluids or single nanoparticles-based nanofluids. These results in terms of boundary layers phenomena, heat transfer performance, and temperature and velocity profiles under hybrid nanomaterial could help chemical engineers to design the critical equipment in a process industry such as heat exchangers and pumps and others.
|
|
| 6. |
- Ullah, Kaleem, et al.
(författare)
-
Cerebral phaeohyphomycosis in liver transplant recipient : A case report
- 2022
-
Ingår i: Clinical Case Reports. - : Wiley. - 2050-0904. ; 10:12
-
Tidskriftsartikel (refereegranskat)abstract
- Cerebral phaeohyphomycosis is a fungal brain infection with a high fatality rate. It is caused by dematiaceous fungi and is increasingly recognized as a cause of serious illness in both immunocompetent and immunocompromised patients. We report cerebral phaeohyphomycosis in a liver transplant recipient. He was treated with multiple surgeries and antifungals and made a complete recovery. This report highlights that early and aggressive surgical intervention and extended antifungal coverage can have a positive outcome even in immunocompromised patients. The fungal infection in immunocompromised patients should be considered and treated aggressively.
|
|
| 7. |
- Yousaf, Muhammad, et al.
(författare)
-
Electrochemical properties of Ni0.4Zn0.6 Fe2O4 and the heterostructure composites (Ni-Zn ferrite-SDC) for low temperature solid oxide fuel cell (LT-SOFC)
- 2020
-
Ingår i: Electrochimica Acta. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0013-4686 .- 1873-3859. ; 331
-
Tidskriftsartikel (refereegranskat)abstract
- In solid oxide fuel cell, the redox reactions (HOR and ORR) demand good catalyst functions at the anode and cathode. Triple phase boundary (TPB) is an important mechanism to determine HOR and ORR as key factors to improve the reaction rate, charge transfer and ion diffusion processes. In the present work, Ni0.4Zn0.6Fe2O4 (Ni-Zn ferrite) and its heterostructures with Sm0.2Ce0.8O2 (SDC) are prepared and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze the phase structure and morphology of the material. X-ray photoelectron spectroscopy (XPS) confirms the phase of Ni-Zn ferrite nanoparticles (NPs) and chemical states on the heterostructure surface. The electrical and conductive behaviors of synthesized samples are investigated through electrochemical impedance spectroscopy (EIS) and fuel cell measurements. Unlike to conventional way, the as-prepared samples promote redox reactions from two aspects: a) as an electrolyte for ion transport; b) as a mixed conductor to extend the ionic transport on TPB region. The ionic transfer mechanism of Ni-Zn ferrite/SDC composite leads the improved fuel cell performance up to 760 mW/cm(2) at 550 degrees C. Further investigations verify the appreciable proton conduction in the prepared devices in a range of 0.012-0.048 Scm(-1).
|
|
| 8. |
- Ali Shah, Usman, et al.
(författare)
-
Accelerating Revised Simplex Method using GPU-based Basis Update
- 2020
-
Ingår i: IEEE Access. - : IEEE. - 2169-3536. ; 8, s. 52121-52138
-
Tidskriftsartikel (refereegranskat)abstract
- Optimization problems lie at the core of scientific and engineering endeavors. Solutions to these problems are often compute-intensive. To fulfill their compute-resource requirements, graphics processing unit (GPU) technology is considered a great opportunity. To this end, we focus on linear programming (LP) problem solving on GPUs using revised simplex method (RSM). This method has potentially GPU-friendly tasks, when applied to large dense problems. Basis update (BU) is one such task, which is performed in every iteration to update a matrix called basis-inverse matrix. The contribution of this paper is two-fold. Firstly, we experimentally analyzed the performance of existing GPU-based BU techniques. We discovered that the performance of a relatively old technique, in which each GPU thread computed one element of the basis-inverse matrix, could be significantly improved by introducing a vectorcopy operation to its implementation with a sophisticated programming framework. Second, we extended the adapted element-wise technique to develop a new BU technique by using three inexpensive vector operations. This allowed us to reduce the number of floating-point operations and conditional processing performed by GPU threads. A comparison of BU techniques implemented in double precision showed that our proposed technique achieved 17.4% and 13.3% average speed-up over its closest competitor for randomly generated and well-known sets of problems, respectively. Furthermore, the new technique successfully updated basisinverse matrix in relatively large problems, which the competitor was unable to update. These results strongly indicate that our proposed BU technique is not only efficient for dense RSM implementations but is also scalable.
|
|
| 9. |
- Amir, Yousaf Muhammad, et al.
(författare)
-
High Precision Laser Scanning of Metallic Surfaces
- 2017
-
Ingår i: International Journal of Optics. - : Hindawi Limited. - 1687-9384 .- 1687-9392.
-
Tidskriftsartikel (refereegranskat)abstract
- Speckle noise, dynamic range of light intensity, and spurious reflections are major challenges when laser scanners are used for 3D surface acquisition. In this work, a series of image processing operations, that is, Spatial Compound Imaging, High Dynamic Range Extension, Gray Level Transformation, and Most Similar Nearest Neighbor are proposed to overcome the challenges coming from the target surface. A prototype scanner for metallic surfaces is designed to explore combinations of these image processing operations. The main goal is to find the combination of operations thatwill lead to the highest possible robustness andmeasurement precision at the lowest possible computational load. Inspection of metallic tools where the surface of its edge must be measured at micrometer precision is our test case. Precision of heights measured without using the proposed image processing is firstly analyzed to be +/- 7.6 mu m at 68% confidence level. The best achieved height precision was +/- 4.2 mu m. This improvement comes at 24 times longer processing time and five times longer scanning time. Dynamic range extension of the image capture improves robustness since the numbers of saturated or underexposed pixels are substantially reduced. Using a high dynamic range (HDR) camera offers a compromise between processing time, robustness, and precision.
|
|
| 10. |
- Javed, Sana, et al.
(författare)
-
Analytic approach to explore dynamical osteoporotic bone turnover
- 2019
-
Ingår i: Advances in Difference Equations. - : Springer Science and Business Media LLC. - 1687-1839 .- 1687-1847.
-
Tidskriftsartikel (refereegranskat)abstract
- The dynamics of the osteoporotic bone turnover is studied in this paper with the aid of stability analysis of the associated mathematical model. Osteoporosis, which is a common bone disorder, is studied in this papper in detail with an emphasis on the relative threshold values. We examine the expository signaling among the bone cells named osteoclast and osteoblast. Main functioning of osteoblasts is bone formation, whereas osteoclasts are bone removal cells. Mathematical framework for osteoporotic bone turnover comprising of the communication between osteoclasts and osteoblasts has been presented to exhibit the conditions for stability in bone turnover. The percentage ratios of the population of osteoblasts/osteoclasts have been determined via numerical simulations. The remedial upshots of targeting osteoporotic cells participating in such process are examined. From our analysis we have conclude that the role of external agents in treating the diseased bone can be better interpreted with the aid of a theoretical model.
|
|
| 11. |
- Khan, Tahir Naeem, et al.
(författare)
-
Evidence for autosomal recessive inheritance in SPG3A caused by homozygosity for a novel ATL1 missense mutation
- 2014
-
Ingår i: European Journal of Human Genetics. - : Springer Science and Business Media LLC. - 1018-4813 .- 1476-5438. ; 22:10, s. 1180-1184
-
Tidskriftsartikel (refereegranskat)abstract
- Hereditary spastic paraplegias (HSPs) comprise a heterogeneous group of disorders characterized by progressive spasticity and weakness of the lower limbs. Autosomal dominant and 'pure' forms of HSP account for similar to 80% of cases in Western societies of whom 10% carry atlastin-1 (ATL1) gene mutations. We report on a large consanguineous family segregating six members with early onset HSP. The pedigree was compatible with both autosomal dominant and autosomal recessive inheritance. Whole-exome sequencing and segregation analysis revealed a homozygous novel missense variant c.353G>A, p.(Arg118Gln) in ATL1 in all six affected family members. Seven heterozygous carriers, five females and two males, showed no clinical signs of HSP with the exception of sub-clinically reduced vibration sensation in one adult female. Our combined findings show that homozygosity for the ATL1 missense variant remains the only plausible cause of HSP, whereas heterozygous carriers are asymptomatic. This apparent autosomal recessive inheritance adds to the clinical complexity of spastic paraplegia 3A and calls for caution using directed genetic screening in HSP.
|
|
| 12. |
- Memon, M. A., et al.
(författare)
-
Aetiology and associations of halitosis : A systematic review
- 2023
-
Ingår i: Oral Diseases. - : Wiley. - 1354-523X .- 1601-0825. ; 29:4, s. 1432-1438
-
Forskningsöversikt (refereegranskat)abstract
- Halitosis is a term that refers to an unpleasant or foul odour originating from the oral cavity that can be caused by either intra-oral or extra-oral factors. Despite the fact that halitosis has multifactorial aetiology, intra-oral factors play a significant role in the majority of cases. This systematic review assesses halitosis's intra-oral and extra-oral associations. An electronic search through MEDLINE (PubMed), Google Scholar and the Wiley Online Library was conducted to identify relevant manuscripts. A keywords-based search was performed, using the terms ‘halitosis’, ‘bad-breath’, and ‘oral malodour causes and aetiology’. Articles published from January 2014 to December 2020 were included. We selected studies evaluating the intra-oral and extra-oral factors that induce oral malodour, as well as the factors associated with systemic diseases. Eighty to ninety percent of halitosis is caused by intra-oral factors, with coated tongue, periodontal diseases and poor oral hygiene practices being the principal factors. Ten to twenty percent of halitosis is induced by extra-oral factors associated with systemic diseases. Multiple factors can cause halitosis, but most of the aetiology is intra-oral. Increased medical awareness is needed to determine the actual pathophysiological process of oral malodour in otherwise healthy individuals.
|
|
| 13. |
- Rasool, Shahzad, et al.
(författare)
-
Insight of proton transport phenomena in semiconductor ionic materials
- 2024
-
Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 598
-
Forskningsöversikt (refereegranskat)abstract
- Semiconductor ionic materials (SIM) have recently gained broad attention due to their unique structural and chemical properties that enable efficient proton transport, making them promising materials for advanced fuel cell applications. This mini-review provides an overview of the proton transport phenomena in SIM and discusses their significance and future perspectives. We discuss the different types of SIMs, their proton transport mechanisms, and the factors that affect their performance. Furthermore, we emphasize the correlation between traditional perovskite oxides and SIMs and how this can be leveraged to improve the development of more advanced proton conductors for fuel cells. Also, we have highlighted the Proton-coupled electron transfer (PCET) mechanism in SIM. This mini-review provides a comprehensive overview of the current state of this emerging field, including its scientific foundations, future prospects, and applicable materials, technologies, devices, and basics for proton ceramic fuel cells (PCFCs).
|
|
| 14. |
- Saadi, Saadia Maryam, et al.
(författare)
-
Genetic Investigation of Consanguineous Pakistani Families Segregating Rare Spinocerebellar Disorders
- 2023
-
Ingår i: Genes. - : MDPI AG. - 2073-4425. ; 14:7
-
Tidskriftsartikel (refereegranskat)abstract
- Spinocerebellar disorders are a vast group of rare neurogenetic conditions, generally characterized by overlapping clinical symptoms including progressive cerebellar ataxia, spastic paraparesis, cognitive deficiencies, skeletal/muscular and ocular abnormalities. The objective of the present study is to identify the underlying genetic causes of the rare spinocerebellar disorders in the Pakistani population. Herein, nine consanguineous families presenting different spinocerebellar phenotypes have been investigated using whole exome sequencing. Sanger sequencing was performed for segregation analysis in all the available individuals of each family. The molecular analysis of these families identified six novel pathogenic/likely pathogenic variants; ZFYVE26: c.1093del, SACS: c.1201C>T, BICD2: c.2156A>T, ALS2: c.2171-3T>G, ALS2: c.3145T>A, and B4GALNT1: c.334_335dup, and three already reported pathogenic variants; FA2H: c.159_176del, APTX: c.689T>G, and SETX: c.5308_5311del. The clinical features of all patients in each family are concurrent with the already reported cases. Hence, the current study expands the mutation spectrum of rare spinocerebellar disorders and implies the usefulness of next-generation sequencing in combination with clinical investigation for better diagnosis of these overlapping phenotypes.
|
|
| 15. |
- Shah, Muhammad Ali Kamran Yousaf, et al.
(författare)
-
The semiconductor SrFe0.2Ti0.8O3-delta-ZnO heterostructure electrolyte fuel cells
- 2019
-
Ingår i: International journal of hydrogen energy. - : Elsevier. - 0360-3199 .- 1879-3487. ; 44:57, s. 30319-30327
-
Tidskriftsartikel (refereegranskat)abstract
- Highly ion-conducting properties in heterostructure composites and semiconductors have drawn significant attention in recent years for developing new electrolytes in low temperature solid oxide fuel cells (LT-SOFCs). In this work, a new semiconductor heterostructure composite SrFe0.2Ti0.8O3-delta, (SFT)-ZnO consisting of p-type SFT and n-type ZnO is proposed and evaluated as an electrolyte in LT-SOFCs. Electrochemical studies reveal that the prepared SFT-ZnO is a mixed ion-electron conductor possessing a high ionic conductivity of 0.21 S cm(-1) at 520 degrees C and the assembled SFT-ZnO fuel cell can achieve a favorable peak power output of 650 mW cm(-2) along with high open-circuit voltage (OCV) of 1.06 V at 520 degrees C. By referring the semiconductor conduction types and energy band parameters of SFT and ZnO, a p-n bulk-heterojunction effect is proposed to describe the electronic blocking and ionic promotion processes of SFT-ZnO electrolyte in a fuel cell. Our work suggests a new insight into the design of effective LT-SOFC electrolytes by using semiconductor heterostructure material.
|
|
| 16. |
- Shibli, Muhammad Awais, et al.
(författare)
-
MagicNET : Security System for Protection of Mobile Agents
- 2011
-
Ingår i: 2010 24TH IEEE INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA). - 9780769540184 ; , s. 1233-1240
-
Konferensbidrag (refereegranskat)abstract
- Protection of Mobile agents is one of the most difficult problems in the area of mobile agents' security. There is not a single, comprehensive solution that provides complete protection of agents against malicious hosts. Existing solutions either only detect or to some extent prevent attacks on agents. With detective mechanisms integrity of an agent's code/state is being checked, but there are no effective solutions for confidentiality of agent's code and baggage. In this paper, we propose a system which provides protection of agent's code against illegal modifications, protection during agents' execution, and also protection of agent's baggage. Design of the system is based on a protective approach, which provides better security compared to traditional detective or preventive methods.
|
|
| 17. |
- Shibli, Muhammad Awais, et al.
(författare)
-
MagicNET : Secure communication methodology for mobile agents
- 2010
-
Ingår i: The 12th International Conference on Advanced Communication Technology. - 9788955191455 ; , s. 1567-1573
-
Konferensbidrag (refereegranskat)abstract
- Most of the current research and development results, dealing with authentication of mobile agents, describe solutions that address only agent-to-platform authentication. These solutions assign privileges to agents so that they can be executed and then, by using the same privileges, also to communicate with other agents running on the same platform. They do not address broader agent-to-agent communication security requirements. Moreover, communication protocols are not based on any standards, what increases the possibilities of communications between benign and malicious agents. In this paper we describe agent-to-agent secure communication methodology that guarantees authenticated, authorized and confidential communication between agents. We use FIPA ACL standard for effective and interoperable communication in our agent-based system.
|
|
| 18. |
- Yasmin, Farah, et al.
(författare)
-
COVID-19 Vaccine Hesitancy in the United States : A Systematic Review
- 2021
-
Ingår i: Frontiers In Public Health. - : Frontiers Media S.A.. - 2296-2565. ; 9
-
Forskningsöversikt (refereegranskat)abstract
- Vaccine hesitancy in the US throughout the pandemic has revealed inconsistent results. This systematic review has compared COVID-19 vaccine uptake across US and investigated predictors of vaccine hesitancy and acceptance across different groups. A search of PUBMED database was conducted till 17th July, 2021. Articles that met the inclusion criteria were screened and 65 studies were selected for a quantitative analysis. The overall vaccine acceptance rate ranged from 12 to 91.4%, the willingness of studies using the 10-point scale ranged from 3.58 to 5.12. Increased unwillingness toward COVID-19 vaccine and Black/African Americans were found to be correlated. Sex, race, age, education level, and income status were identified as determining factors of having a low or high COVID-19 vaccine uptake. A change in vaccine acceptance in the US population was observed in two studies, an increase of 10.8 and 7.4%, respectively, between 2020 and 2021. Our results confirm that hesitancy exists in the US population, highest in Black/African Americans, pregnant or breastfeeding women, and low in the male sex. It is imperative for regulatory bodies to acknowledge these statistics and consequently, exert efforts to mitigate the burden of unvaccinated individuals and revise vaccine delivery plans, according to different vulnerable subgroups, across the country.
|
|
| 19. |
- Yousaf, M., et al.
(författare)
-
Evaluation of rare earth (Yb, La) doped (Sm3Fe5O12) garnet ferrite membrane for LT-SOFC
- 2020
-
Ingår i: International journal of hydrogen energy. - : Elsevier Ltd. - 0360-3199 .- 1879-3487.
-
Tidskriftsartikel (refereegranskat)abstract
- Rare earth element doping is a popular methodology for improving the electrical and electrochemical properties of materials. Inspired by this ideology, garnet ferrite material Sm3Fe5O12 (SFO) doped by rare earth (Yb, La) metal ions to form Sm3-0.5Yb0.5Fe5O12 (SYFO) and Sm3-0.5La0·5Fe5O12 (SLFO). The samples are synthesized by sol gel auto combustion and have been applied as electrolyte membrane for the first time in low temperature solid oxide fuel cell (LT-SOFC). The results indicate that the as-prepared materials have triple charge transport (H+/O−2/e−) carrier which promotes the hydrogen oxidation reaction (HOR) and oxygen reduction reactions (ORR) in SOFC at triple phase boundary region (TPB). Electrochemical impedance spectroscopy (EIS) reveals that the polarization resistance of SLFO membrane significantly reduces from 0.92 Ω-cm2 to 0.45 Ω-cm2 and the power output improve from 310 mW/cm2 to 650 mW/cm2 at 550 °C temperature in comparison with that of SYFO and SFO electrolyte supported cells. UV-vis diffused spectroscopy explains the semiconducting nature of the prepared materials due to the existence of optical bandgap in the semiconductor region. The further investigation also verifies the protonic conduction of SLFO membrane by constructing oxygen ion blocking fuel cell with configuration of Ni-NCAL/BZCY/SLFO/BZCY/Ni-NCAL having 427.94 mW/Cm2 fuel cell performance with 1.03 OCV at 550 °C temperature.
|
|
