| 1. |
- Dai, Yi, et al.
(författare)
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Zn-doped CaFeO3 perovskite-derived high performed catalyst on oxygen reduction reaction in microbial fuel cells
- 2021
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Ingår i: Journal of Power Sources. - : ELSEVIER. - 0378-7753 .- 1873-2755. ; 489
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Tidskriftsartikel (refereegranskat)abstract
- Stable perovskite oxide is considered as a potential cathode for microbial fuel cells (MFCs). Herein, Zn is used as an effective element to modify the micro-structure and oxygen vacancy of perovskite to be a novel cathode catalyst. Physical characterizations show that due to partial volatilization at high temperature of Zn, perovskite forms hierarchically porous structures. Moreover, Zn is precipitated in electrochemical reaction to generate Zn vacancy in situ; thus, the active center of Fe has a superior interaction with oxygen-containing species, promoting the production of oxygen vacancy and forms a mixed valence state of Fe2+/Fe3+. The Zn-doped perovskite material CaFe0.7Zn0.3O3 exhibits remarkable oxygen reduction reaction (ORR) performances with outstanding onset potential (0.194 V vs. Ag/AgCl) and half-wave potential (-0.219 V vs. Ag/AgCl) under alkaline condition, which is better than Pt/C catalyst. Besides, CaFe0.7Zn0.3O3 shows an excellent four-electron pathway of ORR mechanism with remarkable corrosion resistance and stability, which enables a more reliable cathode electrocatalyst. The maximum power density of CaFe0.7Zn0.3O3 (892.10 +/- 90.79 mW m(-3)) testing on microbial fuel cell is comparable to the maximum power density (1012.86 +/- 84.03 mW m(-3)) of Pt/C. The findings of this work provide the feasibility of exploring inexpensive and high-performance cathode catalyst.
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| 2. |
- Wang, Yan, et al.
(författare)
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Bimetallic hybrids modified with carbon nanotubes as cathode catalysts for microbial fuel cell: Effective oxygen reduction catalysis and inhibition of biofilm formation
- 2021
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Ingår i: Journal of Power Sources. - Amsterdam, Netherlands : Elsevier. - 0378-7753 .- 1873-2755. ; 485
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Tidskriftsartikel (refereegranskat)abstract
- As a promising energy conversion equipment, the performance of microbial fuel cell (MFC) is affected by slow kinetics of oxygen reduction reaction (ORR). It is of great significance to explore electrocatalysts with high activity for sustainable energy applications. Herein, we synthesize the in-situ grown carbon nanotubes decorated electrocatalyst derived from copper-based metal organic frameworks (MOFs) co-doped with cobalt and nitrogen (CuCo@NCNTs) through straightforward immersion and pyrolysis process. The carbon nanotubes produced by metallic cobalt and high-activity bimetallic active sites formed by nitrogen doping enable CuCo@NCNTs to have the best oxygen reduction reaction (ORR) performance in alkaline electrolyte, with limit current density of 5.88 mA cm-2 and onset potential of 0.91 V (vs. RHE). Moreover, CuCo@NCNTs nanocomposite exhibits obvious antibacterial activity, and inhibiting the biofilm on cathode surface in antibacterial test and biomass quantification. The maximum power density (2757 mW m-3) of MFC modified with CuCo@NCNTs is even higher than Pt/C catalyst (2313 mW m-3). In short, CuCo@NCNTs nanocomposite can be an alternative cathode catalyst for MFC.
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| 3. |
- Jia, Xinyu, et al.
(författare)
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Knee-point-conscious battery aging trajectory prediction of lithium-ion based on physics-guided machine learning
- 2024
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Ingår i: IEEE Transactions on Transportation Electrification. - 2332-7782. ; 10:1, s. 1056-1069
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Tidskriftsartikel (refereegranskat)abstract
- Early prediction of aging trajectories of lithium-ion (Li-ion) batteries is critical for cycle life testing, quality control, and battery health management. Although data-driven machine learning (ML) approaches are well suited for this task, unfortunately, relying solely on data is exceedingly time-consuming and resource-intensive, even in accelerated aging with complex aging mechanisms. This challenge is rooted in the highly complex and time-varying degradation mechanisms of Li-ion battery cells. We propose a novel method based on physics-guided machine learning (PGML) to overcome this issue. First, electrode-level physical information is incorporated into the model training process to predict the aging trajectory’s knee point (KP). The relationship between the identified KP and the accelerated aging behavior is then explored, and an aging trajectory prediction algorithm is developed. The prior knowledge of aging mechanisms enables a transfer of valuable physical insights to yield accurate KP predictions with small data and weak correlation feature relationship. Based on a Li[NiCoMn]O 2 cell dataset, we demonstrate that only 14 cells are needed to train a PGML model for achieving a lifetime prediction error of 2.02% using the data of the first 50 cycles. In contrast, at least 100 cells are needed to reach this level of accuracy without the physical insights.
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| 4. |
- Shen, Jue, et al.
(författare)
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A 180 nm-CMOS Asymmetric UWB-RFID Tag with Real-time Remote-monitored ECG-sensing
- 2015
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Ingår i: Proceedings of the International Conference on Biomedical Electronics and Devices. - : SCITEPRESS - Science and and Technology Publications. - 9789897580710 ; , s. 210-215
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Konferensbidrag (refereegranskat)abstract
- This paper proposes an asymmetric ultra-wideband - radio frequency identification (UWB-RFID) tag with electrocardiogram (ECG)-sensing capability for patients remote-monitoring in hospital environment. A UWB-RFID communication protocol is suggested for real-time transmission of undistorted ECG by interleaving ADC sampling and burst-mode UWB transmission. The proposed system shows a maximum accessing capability of 400 tags/second at 1.5 KHz ECG sampling rate with 10 Mbps UWB pulse rate. The tag consists of UHF-RFID receiver, UWB transmitter, ECG analog front-end, multi-input ADC and baseband circuitry integrated on two silicon dies. It was implemented by 6 mm2 -sized 180 nm CMOS technology. Electrodes for ECG-sensing are manufactured by inkjet-printing on polyimide substrate. Experiment results show that the tag transmits UWB pulses at 1 Mbps rate with 18 µW power. The printed electrodes conduct ECG waveform comparable to commercial electrodes.
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| 5. |
- Shen, Jue, et al.
(författare)
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Interactive UHF/UWB RFID Tag for Mass Customization
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Mass customization (MC) under the context ofthe Internet of Things (IoT) is expected to reform traditionalmass manufacturing. To contribute to MC from information communication and user interaction aspects, this work proposes an Ultra-High Frequency (UHF) RFID tag with Impulse-Radio Ultra-Wide Band (IR UWB) transmitter and inkjet-printed Electrochromic (EC) display. First, compared to conventional UHF RFID tags, the proposed tag shows advantages of higher data rate while still keeping low power consumption. A modified communication protocol for such tag is proposed to decrease the response time in multi-tag accessing scenarios to less than 500 ms/1000 tags by the pipeline of IR UWB transmission of tag response and UHF RFID reception of reader acknowledgement and by reducingthe length of empty slots. Secondly, the tag is integrated with a flexible Electro-chromic (EC) display manufactured by inkjet-printing on the polyimide substrate. The tag with the display works as an automatically refreshed paper label which offers an intuitive human-to-device interface to improve the efficiency of the offline workers. To conquer material variation while make use of long retention time of the printed EC display, the threshold voltage of EC display is utilized and a feedback comparator is designed to start refreshing EC display based on the threshold voltage. For functional verification, a Silicon-on-Chip (SoC) is implementedin UMC 180 nm CMOS process. According to experimental results: 1) the IR UWB transmitter shows performances of 1.02 V pulse amplitude, 900 ps pulse duration and 18 pJ/pulse energy consumption; 2) the EC display driver with a feedback comparator automatically starts to refresh display when the image fades out, and reduces the power consumption for retaining image to 1.98 mW per 1 cm2 display size. The UHF/UWB RFID display tag integrated on polyimide substrate is conceptually demonstrated at the end of the paper.
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| 6. |
- Shen, Jue, et al.
(författare)
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Interactive UHF/UWB RFID tag for mass customization
- 2017
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Ingår i: Information Systems Frontiers. - : Springer. - 1387-3326 .- 1572-9419. ; 19:5, s. 1177-1190
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Tidskriftsartikel (refereegranskat)abstract
- Mass customization (MC) under the context of the Internet of Things (IoT) is expected to reform the traditional mass manufacturing. To contribute to MC from information communication and user interaction aspects, this work proposes an Ultra-High Frequency (UHF) RFID tag with an Impulse-Radio Ultra-Wide Band (IR-UWB) transmitter and an inkjet-printed Electrochromic (EC) display. First, compared to the conventional UHF RFID tags, the proposed tag shows the advantage of higher transmission data rate with still low power consumption. The response time in multi-tag accessing scenarios can be reduced to less than 500 ms per 1000 tags by the pipeline of the tag responses in IR-UWB link and the reader acknowledgments in UHF RFID link as well as by reducing the length of empty slots. Second, the tag is integrated with a flexible EC display manufactured by inkjet-printing on the polyimide substrate. It works as an automatically refreshed paper label that offers an intuitive human-to-device interface to improve the efficiency of the offline workers. To conquer the material variations and make use of the long retention time of the printed EC display, its threshold voltage is utilized and a feedback comparator enabling the display driver by the threshold voltage is designed. A System-on-Chip (SoC) is implemented in UMC 0.18 mu m CMOS process. According to the experimental results: 1) the IR-UWB transmitter achieves 1.02 V pulse amplitude and 900 ps pulse duration with 18 pJ/pulse energy consumption; 2) the EC display driver automatically refreshes the display when the image fades out, and consumes 1.98 mu W per 1 cm(2) display size to retain an image. The UHF/UWB RFID display tag integrated on polyimide substrate is conceptually demonstrated at the end of the paper.
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| 7. |
- You, Henghui, et al.
(författare)
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Novel Strontium/Iron Bimetallic Carbon Composites as Synergistic Catalyst for Oxygen Reduction Reaction in Microbial Fuel Cells
- 2021
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Ingår i: Electrocatalysis. - : SPRINGER. - 1868-2529 .- 1868-5994. ; 12:6, s. 759-770
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Tidskriftsartikel (refereegranskat)abstract
- It is critical to develop non-noble metal (NNM) electrocatalysts with excellent stability and innovative activity for oxygen reduction reaction (ORR) in the microbial fuel cells (MFCs), which is a promising energy conversion technology. Herein, the preparation of iron carbide electrocatalysts (SrCO3/Fe3C) by the pyrolysis of a bimetal precursor (Sr and Fe) is proposed as a feasible strategy to realize a highly active electrocatalyst for ORR. Based on the catalytic potential of Sr-based materials, Fe species doping can provide more beneficial active sites for ORR. Concisely, the SrCO3/Fe3C(1:12) catalyst achieves the onset potential of 0.197 V (vs. Ag/AgCl) superior than Pt/C catalyst (0.193 V vs. Ag/AgCl) and the half-wave potential of -0.157 V (vs. Ag/AgCl) in 0.1-M KOH solution. Furthermore, the electrocatalyst exhibits nearly four-electron pathway, and generates less than 3% H2O2. Compared with Pt/C catalyst, it possesses preferable stability and superior methanol tolerance. Moreover, a composite electrode with SrCO3/Fe3C(1:12) as a catalyst on the carbon cloth demonstrated a superb air cathode in MFCs with a power density of 398.98 mW m(-2), which can outperform than 10 wt% Pt/C catalysts (342.13 mW m(-2)) on MFCs.
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