Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery
Abstract The scarcity of wettability, insufficient active sites, and low surface area of graphite felt (GF) have long been suppressing the performance of vanadium redox flow batteries (VRFBs). Herein, an ultra‐homogeneous multiple‐dimensioned defect, including nano‐scale etching and atomic‐scale N,...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-02-01
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| Series: | Carbon Energy |
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| Online Access: | https://doi.org/10.1002/cey2.537 |
| _version_ | 1827338462960812032 |
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| author | Yingqiao Jiang Yinhui Wang Gang Cheng Yuehua Li Lei Dai Jing Zhu Wei Meng Jingyu Xi Ling Wang Zhangxing He |
| author_facet | Yingqiao Jiang Yinhui Wang Gang Cheng Yuehua Li Lei Dai Jing Zhu Wei Meng Jingyu Xi Ling Wang Zhangxing He |
| author_sort | Yingqiao Jiang |
| collection | DOAJ |
| description | Abstract The scarcity of wettability, insufficient active sites, and low surface area of graphite felt (GF) have long been suppressing the performance of vanadium redox flow batteries (VRFBs). Herein, an ultra‐homogeneous multiple‐dimensioned defect, including nano‐scale etching and atomic‐scale N, O co‐doping, was used to modify GF by the molten salt system. NH4Cl and KClO3 were added simultaneously to the system to obtain porous N/O co‐doped electrode (GF/ON), where KClO3 was used to ultra‐homogeneously etch, and O‐functionalize electrode, and NH4Cl was used as N dopant, respectively. GF/ON presents better electrochemical catalysis for VO2+/VO2+ and V3+/V2+ reactions than only O‐functionalized electrodes (GF/O) and GF. The enhanced electrochemical properties are attributed to an increase in active sites, surface area, and wettability, as well as the synergistic effect of N and O, which is also supported by the density functional theory calculations. Further, the cell using GF/ON shows higher discharge capacity, energy efficiency, and stability for cycling performance than the pristine cell at 140 mA cm−2 for 200 cycles. Moreover, the energy efficiency of the modified cell is increased by 9.7% from 55.2% for the pristine cell at 260 mA cm−2. Such an ultra‐homogeneous etching with N and O co‐doping through “boiling” molten salt medium provides an effective and practical application potential way to prepare superior electrodes for VRFB. |
| first_indexed | 2024-03-07T19:14:52Z |
| format | Article |
| id | doaj.art-1a72854e770d43a4b07fa7f3e77bb138 |
| institution | Directory Open Access Journal |
| issn | 2637-9368 |
| language | English |
| last_indexed | 2024-03-07T19:14:52Z |
| publishDate | 2024-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Carbon Energy |
| spelling | doaj.art-1a72854e770d43a4b07fa7f3e77bb1382024-02-29T15:44:35ZengWileyCarbon Energy2637-93682024-02-0162n/an/a10.1002/cey2.537Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow batteryYingqiao Jiang0Yinhui Wang1Gang Cheng2Yuehua Li3Lei Dai4Jing Zhu5Wei Meng6Jingyu Xi7Ling Wang8Zhangxing He9School of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaTsinghua Shenzhen International Graduate School, Institute of Materials Research Tsinghua University Shenzhen ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaSchool of Chemical Engineering North China University of Science and Technology Tangshan ChinaAbstract The scarcity of wettability, insufficient active sites, and low surface area of graphite felt (GF) have long been suppressing the performance of vanadium redox flow batteries (VRFBs). Herein, an ultra‐homogeneous multiple‐dimensioned defect, including nano‐scale etching and atomic‐scale N, O co‐doping, was used to modify GF by the molten salt system. NH4Cl and KClO3 were added simultaneously to the system to obtain porous N/O co‐doped electrode (GF/ON), where KClO3 was used to ultra‐homogeneously etch, and O‐functionalize electrode, and NH4Cl was used as N dopant, respectively. GF/ON presents better electrochemical catalysis for VO2+/VO2+ and V3+/V2+ reactions than only O‐functionalized electrodes (GF/O) and GF. The enhanced electrochemical properties are attributed to an increase in active sites, surface area, and wettability, as well as the synergistic effect of N and O, which is also supported by the density functional theory calculations. Further, the cell using GF/ON shows higher discharge capacity, energy efficiency, and stability for cycling performance than the pristine cell at 140 mA cm−2 for 200 cycles. Moreover, the energy efficiency of the modified cell is increased by 9.7% from 55.2% for the pristine cell at 260 mA cm−2. Such an ultra‐homogeneous etching with N and O co‐doping through “boiling” molten salt medium provides an effective and practical application potential way to prepare superior electrodes for VRFB.https://doi.org/10.1002/cey2.537graphite feltmolten saltNO co‐dopingultra‐homogeneous etchingvanadium redox flow battery |
| spellingShingle | Yingqiao Jiang Yinhui Wang Gang Cheng Yuehua Li Lei Dai Jing Zhu Wei Meng Jingyu Xi Ling Wang Zhangxing He Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery Carbon Energy graphite felt molten salt N O co‐doping ultra‐homogeneous etching vanadium redox flow battery |
| title | Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery |
| title_full | Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery |
| title_fullStr | Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery |
| title_full_unstemmed | Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery |
| title_short | Multiple‐dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery |
| title_sort | multiple dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery |
| topic | graphite felt molten salt N O co‐doping ultra‐homogeneous etching vanadium redox flow battery |
| url | https://doi.org/10.1002/cey2.537 |
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