| 1. |
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- 2019
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Caretta, Martina Angela, et al.
(författare)
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Water
- 2022
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Ingår i: Climate Change 2022: Impacts, Adaptation and Vulnerability : Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change - Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change.
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Hu, Enyi, et al.
(författare)
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Junction and energy band on novel semiconductor-based fuel cells
- 2021
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Ingår i: iScience. - : Elsevier BV. - 2589-0042. ; 24:3
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Forskningsöversikt (refereegranskat)abstract
- Fuel cells are highly efficient and green power sources. The typical membrane electrode assembly is necessary for common electrochemical devices. Recent research and development in solid oxide fuel cells have opened up many new opportunities based on the semiconductor or its heterostructure materials. Semiconductor-based fuel cells (SBFCs) realize the fuel cell functionality in a much more straightforward way. This work aims to discuss new strategies and scientific principles of SBFCs by reviewing various novel junction types/interfaces, i.e., bulk and planar p-n junction, Schottky junction, and n-i type interface contact. New designing methodologies of SBFCs from energy band/alignment and built-in electric field (BIEF), which block the internal electronic transport while assisting interfacial superionic transport and subsequently enhance device performance, are comprehensively reviewed. This work highlights the recent advances of SBFCs and provides new methodology and understanding with significant importance for both fundamental and applied R&D on new-generation fuel cell materials and technologies.
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| 4. |
- Jayne, David R W, et al.
(författare)
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Glomerulonephritides.
- 2014
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Ingår i: Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association. - : Oxford University Press (OUP). - 1460-2385. ; 29 Suppl 3, s. 27-29
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Konferensbidrag (refereegranskat)
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| 5. |
- Li, Yihang, et al.
(författare)
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Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode
- 2021
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Ingår i: SCIENCE CHINA Materials. - : Springer Science and Business Media LLC. - 2095-8226 .- 2199-4501. ; 64:5, s. 1114-1126
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Tidskriftsartikel (refereegranskat)abstract
- The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr3Fe1.25Mo0.75O7−δ (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr3Fe1.25Mo0.75O7−δ (SFM) from a Sr2Fe7/6Mo0.5Co1/3O6−δ (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO2 conversion in RSOC. The CoFe-SFM fuel electrode shows improved catalytic activity by accelerating oxygen diffusion and surface kinetics towards the CO/CO2 conversion as demonstrated by the distribution of relaxation time (DRT) study and equivalent circuit model fitting analysis. Furthermore, an electrolyte-supported single cell is evaluated in the 2:1 CO-CO2 atmosphere at 800°C, which shows a peak power density of 259 mW cm−2 for CO oxidation and a current density of −0.453 A cm−2 at 1.3 V for CO2 reduction, which correspond to 3.079 and 3.155 mL min−1 cm−2 for the CO and CO2 conversion rates, respectively. More importantly, the reversible conversion is successfully demonstrated over 20 cyclic electrolysis and fuel cell switching test modes at 1.3 and 0.6 V. This work provides a useful guideline for designing a fuel electrode through a surface/interface exsolution process for RSOC towards efficient CO-CO2 reversible conversion.
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| 6. |
- Liu, Liang, et al.
(författare)
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The composite electrolyte with an insulation Sm2O3 and semiconductor NiO for advanced fuel cells
- 2018
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Ingår i: International journal of hydrogen energy. - : Elsevier. - 0360-3199 .- 1879-3487. ; 43:28, s. 12739-12747
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Tidskriftsartikel (refereegranskat)abstract
- Novel Sm2O3-NiO composite was prepared as the functional electrolyte for the first time. The total electrical conductivity of Sm2O3-NiO is 0.38 S cm(-1) in H-2/air condition at 550 degrees C. High performance, e.g. 718 mW cm(-2), was achieved using Sm2O3-NiO composite as an electrolyte of solid oxide fuel cells operated at 550 degrees C. The electrical properties and electrochemical performance are strongly depended on Sm2O3 and NiO constituent phase of the compositions. Notably, surprisingly high ionic conductivity and fuel cell performance are achieved using the composite system constituting with insulating Sm2O3 and intrinsic p-type conductive NiO with a low conductivity of 4 x 10(-3) S cm(-1). The interfacial ionic conduction between two phases is a dominating factor giving rise to significantly enhanced proton conduction. Fuel cell performance and further ionic conduction mechanisms are under investigation.
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| 7. |
- Sharma, Sandeep, et al.
(författare)
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A non-classical route of efficient plant uptake verified with fluorescent nanoparticles and root adhesion forces investigated using AFM
- 2020
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10:1
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Tidskriftsartikel (refereegranskat)abstract
- Classical plant uptake is limited to hydrophilic or water-dispersible material. Therefore, in order to test the uptake behaviour of hydrophobic particles, here, we tested the fate of hydrophobic particles (oleylamine coated Cu2-xSe NPs (CS@OA)) in comparison to hydrophilic particles (chitosan-coated Cu2-xSe NPs (CS@CH)) by treatment on the plant roots. Surprisingly, hydrophobic CS@OA NPs have been found to be ~ 1.3 times more efficient than hydrophilic CS@CH NPs in tomato plant root penetration. An atomic force microscopy (AFM) adhesion force experiment confirms that hydrophobic NPs experience non-spontaneous yet energetically favorable root trapping and penetration. Further, a relative difference in the hydrophobic vs. hydrophilic NPs movement from roots to shoots has been observed and found related to the change in protein corona as identified by two dimensional-polyacrylamide gel electrophoresis (2D-PAGE) analysis. Finally, the toxicity assays at the give concentration showed that Cu2-xSe NPs lead to non-significant toxicity as compared to control. This technology may find an advantage in fertilizer application.
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| 8. |
- Singh, Manish, et al.
(författare)
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Conductive and enzyme-like silk fibers for soft sensing application
- 2020
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Ingår i: Biosensors and Bioelectronics. - : Elsevier BV. - 0956-5663. ; 150, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- A combination of supercritical carbon dioxide (scCO2) impregnation of pyrrole and sonochemical transformation of permanganate (KMnO4) was used to impart conductive and catalytic properties to silk fibers. The results indicated that the conductivity (from polypyrrole –PPy) and catalytic activities (from manganese dioxide –MnO2) were independent and complementary within the processing parameters used. The enhanced conductivity was attributed to scCO2 preferentially distributing the pyrrole monomers along with the silk internal fibrillar structure and hence, yielding a more linear PPy. The oxidative properties of the PPy-MnO2-silk hybrid showed an enzyme-like behavior for the degradation of hydrogen peroxide (H2O2) with a Km of about 13 mM and specific activity of 1470 ± 75 μmol/min/g. Finally, we demonstrated that the PPy-MnO2-silk hybrid could be used as soft working electrodes for the simultaneous degradation and detection of H2O2.
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| 9. |
- Singh, Manish, et al.
(författare)
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Manganese oxide functionalized silk fibers for enzyme mimics application
- 2020
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Ingår i: Reactive and Functional Polymers. - : Elsevier BV. - 1381-5148.
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Tidskriftsartikel (refereegranskat)abstract
- The inorganic metal or metal-oxide nanoparticles (NPs) that mimic enzymes are of great interest due to improved physical and chemical properties compared with native enzymes. Here, we report that manganese dioxide (MnO2)-Silk exhibit catalase, oxidase, and peroxidase-like activities. The MnO2-Silk hybrid fibers effectively decomposed hydrogen peroxide (H2O2) and oxidized the typical horseradish peroxidase substrates, such as o-phenylenediamine (OPD), and 3,3′,5,5′- tetramethylbenzidine (TMB) in the presence or absence of H2O2. The oxidative properties of MnO2-Silk fiber hybrid showed an enzyme-like behavior for the catalase-like activity, oxidase-like activity, and peroxidase-like activity. The operational stability of the MnO2-Silk fiber hybrid over ten cycles showed a constant residual activity of about 25–30% after 2–3 cycles indicating that MnO2-Silk fiber hybrid could be used as a satisfactory oxidoreductase enzyme mimics. Potentiometric titration was used to determine the surface charges of the MnO2-Silk catalyst. Together, we identified the reactive species as Mn1−x4+Mnx3+O2−x(OH)x with a pK of approximately 5.2. Our results have implications on the understanding of the catalytic origin and interaction of metal oxides NP with various biomaterials.
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| 10. |
- Singh, Manish
(författare)
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Multifunctional silk: from fabrication to application
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Silk fibers offer untapped internal structures to template the formation of nano-objects and active coatings. So far, access to all or part of the internal and organized structures has been a significant challenge. The aim of the thesis is, therefore, to identify and exploit silk templating ability to create value-added multifunctional hybrid materials with enhanced conductive and catalytic properties. The application of nanotechnology in textiles is limited by the difficulties of loading the textile fibers with nanoparticles (NPs), and by the uncontrolled leakage of the loaded NPs. We first demonstrate using supercritical carbon dioxide (sc-CO2) impregnation that the four major commercially available Indian silk (mulberry, eri, tasar and muga) could be loaded without leakage with standard gold NPs sized between 5-150 nm. Next, we developed a one-step synthesis and impregnation of metal oxides in the silk fibers using mild sonication. Here we sonochemically reduce potassium permanganate (KMnO4)to manganese oxide (MnO2) in silk fibers. The obtained MnO2-Silk hybrid fibers effectively decomposed hydrogen peroxide (H2O2) and oxidized the typical horseradish peroxidase substrates, such as o-phenylenediamine (OPD), and 3,3´,5,5´- tetramethylbenzidine (TMB) in the presence or absence of H2O2. The oxidative properties of MnO2-Silk fiber hybrid showed an enzyme-like behavior for the catalase-like activity,oxidase-like activity, and peroxidase-like activity. The operational stability of the MnO2-Silk fiber hybrid over ten cycles showed a constant residual activity of about 25-30% after 2-3 cycles indicating that MnO2-Silk fiber hybrid could be used as a satisfactory oxidoreductase enzyme mimics. We used potentiometric titration to understand the surface charges on the MnO2-Silk hybrid materials. We identified the reactive species with a pK of approximately 5.2. We further developed an in-situ UV-Visible spectroscopy-based method to study the mechanism of formation of MnO2 on a silk film and its associated enzymatic activity. The results suggested a three components route for sonication and auto-reduction (as control) to form MnO2-Silk from KMnO4. Overall, we found that the smaller size, more mono-dispersed, and deeper buried MnO2 NPs in silk film prepared by sonication, conferred a higher catalytic activity and stability to the hybrid material. The dimensions and oxidation states of the MnO2-Silk hybrid material were determined by the use of X-says structural and spectroscopic methods: a small-angle X-ray scattering (SAXS), anomalous small-angle X-ray scattering (ASAXS), and near-edge X-ray absorption fine structure (NEXAFS). ASAXS allowed us to analyze the MnO2 alone. We found that the MnO2 NP had a size below 20 nm. NEXAFS (pre-peak and main peak) confirms the formation of Mn(IV) oxide. Finally, we demonstrated that the combination of scCO2 impregnation and sonochemistry could yield new or improved multifunctionality. Here we fabricated a soft working electrode for the simultaneous degradation and detection of hydrogen peroxide (H2O2). The multifunctional silk hybrid showed an enzyme-like behavior for the degradation of H2O2 with a Km of about 13 mM. Together these studies suggest that judicious access and use of silk internal structures can enhance silk already remarkable properties.
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