Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries
Surface electroactive sites for tungstate zirconia (WZ) were created by utilizing tungstate-immobilized UiO-66 as precursors via a double-solvent impregnation method under a mild calcination temperature. The WZ-22-650 catalyst, containing a moderate W content (22%), demonstrated a high density of surface electroactive sites. Proper heat treatment facilitated the binding of oligomeric tungsten clusters to stabilized tetragonal ZrO2, resulting in improved catalytic performance toward the VO2+/VO2+ redox couples compared to other tested samples. The substantial surface area, mesoporous structure, and establishment of new W-O-Zr bonds affirm the firm anchoring of WOx to ZrO2. This robust attachment enhances surface electroactive sites, elevating the electrochemical performance of vanadium redox flow batteries (VRFBs). Charge-discharge tests further demonstrate that the superior voltage efficiency (VE) and energy efficiency (EE) for VRFBs using the WZ-22-650 catalyst are 87.76 and 83.94% at 80 mA cm-2, which are 13.42% VE and 10.88% EE better than heat-treated graphite felt, respectively. Even at a higher current density of 160 mA cm-2, VRFBs utilizing the WZ-22-650 catalyst maintained considerable efficiency, recording VE and EE values of 76.76 and 74.86%, respectively. This facile synthesis method resulted in WZ catalysts displaying superior catalytic activity and excellent cyclability, offering a promising avenue for the development of metal-oxide-based catalysts.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:16 |
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| Enthalten in: |
ACS applied materials & interfaces - 16(2024), 6 vom: 14. Feb., Seite 7047-7056 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Demeku, Aknachew Mebreku [VerfasserIn] |
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| Links: |
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| Themen: |
Double-solvent method |
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| Anmerkungen: |
Date Revised 21.02.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1021/acsami.3c14633 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM368040194 |
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| 520 | |a Surface electroactive sites for tungstate zirconia (WZ) were created by utilizing tungstate-immobilized UiO-66 as precursors via a double-solvent impregnation method under a mild calcination temperature. The WZ-22-650 catalyst, containing a moderate W content (22%), demonstrated a high density of surface electroactive sites. Proper heat treatment facilitated the binding of oligomeric tungsten clusters to stabilized tetragonal ZrO2, resulting in improved catalytic performance toward the VO2+/VO2+ redox couples compared to other tested samples. The substantial surface area, mesoporous structure, and establishment of new W-O-Zr bonds affirm the firm anchoring of WOx to ZrO2. This robust attachment enhances surface electroactive sites, elevating the electrochemical performance of vanadium redox flow batteries (VRFBs). Charge-discharge tests further demonstrate that the superior voltage efficiency (VE) and energy efficiency (EE) for VRFBs using the WZ-22-650 catalyst are 87.76 and 83.94% at 80 mA cm-2, which are 13.42% VE and 10.88% EE better than heat-treated graphite felt, respectively. Even at a higher current density of 160 mA cm-2, VRFBs utilizing the WZ-22-650 catalyst maintained considerable efficiency, recording VE and EE values of 76.76 and 74.86%, respectively. This facile synthesis method resulted in WZ catalysts displaying superior catalytic activity and excellent cyclability, offering a promising avenue for the development of metal-oxide-based catalysts | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a double-solvent method | |
| 650 | 4 | |a electrocatalysts | |
| 650 | 4 | |a metal−organic frameworks | |
| 650 | 4 | |a tungstated zirconia | |
| 650 | 4 | |a vanadium redox flow batteries | |
| 700 | 1 | |a Kabtamu, Daniel Manaye |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Guan-Cheng |e verfasserin |4 aut | |
| 700 | 1 | |a Ou, Yun-Ting |e verfasserin |4 aut | |
| 700 | 1 | |a Huang, Zih-Jhong |e verfasserin |4 aut | |
| 700 | 1 | |a Chiang, Tai-Chin |e verfasserin |4 aut | |
| 700 | 1 | |a Huang, Hsin-Chih |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Chen-Hao |e verfasserin |4 aut | |
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