Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries
Bifunctional oxygen catalyst is an important component in the cathode for rechargeable zinc-air batteries. MnO2 catalysts have aroused intense interests owing to their promising activity for oxygen reduction reaction (ORR), which, however, is still not comparable to precious metal catalysts. To impr...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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WILEY-V C H VERLAG GMBH
2020
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| Online Access: | https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 http://hdl.handle.net/20.500.11937/91960 |
| _version_ | 1848765606091816960 |
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| author | Zhong, Yijun Dai, J. Xu, Xiaomin Su, Chao Shao, Zongping |
| author_facet | Zhong, Yijun Dai, J. Xu, Xiaomin Su, Chao Shao, Zongping |
| author_sort | Zhong, Yijun |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Bifunctional oxygen catalyst is an important component in the cathode for rechargeable zinc-air batteries. MnO2 catalysts have aroused intense interests owing to their promising activity for oxygen reduction reaction (ORR), which, however, is still not comparable to precious metal catalysts. To improve the ORR catalysis and meet the requirement for a bifunctional oxygen catalyst, MnO2 nanosheets are modified with Co, Ni or Fe via a facile solution-based method. Among the modified samples, Co−MnO2 presents improved catalysis for both ORR and oxygen evolution reaction (OER). The modification introduces additional active sites for OER and induced more oxygen defects to further facilitate the ORR. Zn-air batteries with the Co−MnO2 air cathode showed a higher peak power density of 167 mW cm−2, a lower potential gap of 0.75 V and a higher round-trip efficiency of 63 % (5 mA cm−2) compared to MnO2 without modification. Good cycling stability of the battery is also achieved. The proper amount of cobalt species in the MnO2 is vital for achieving a balance between high performance and durable cycling. |
| first_indexed | 2025-11-14T11:37:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-91960 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:37:55Z |
| publishDate | 2020 |
| publisher | WILEY-V C H VERLAG GMBH |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-919602023-06-08T06:28:55Z Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries Zhong, Yijun Dai, J. Xu, Xiaomin Su, Chao Shao, Zongping Science & Technology Physical Sciences Electrochemistry zinc-air battery oxygen reduction reaction oxygen evolution reaction oxygen defect manganese oxide REDUCTION REACTION ELECTROCATALYTIC ACTIVITY BIFUNCTIONAL CATALYSTS PEROVSKITE OXIDES MNO2 PERFORMANCE EVOLUTION VACANCIES NANOPARTICLES MORPHOLOGY Bifunctional oxygen catalyst is an important component in the cathode for rechargeable zinc-air batteries. MnO2 catalysts have aroused intense interests owing to their promising activity for oxygen reduction reaction (ORR), which, however, is still not comparable to precious metal catalysts. To improve the ORR catalysis and meet the requirement for a bifunctional oxygen catalyst, MnO2 nanosheets are modified with Co, Ni or Fe via a facile solution-based method. Among the modified samples, Co−MnO2 presents improved catalysis for both ORR and oxygen evolution reaction (OER). The modification introduces additional active sites for OER and induced more oxygen defects to further facilitate the ORR. Zn-air batteries with the Co−MnO2 air cathode showed a higher peak power density of 167 mW cm−2, a lower potential gap of 0.75 V and a higher round-trip efficiency of 63 % (5 mA cm−2) compared to MnO2 without modification. Good cycling stability of the battery is also achieved. The proper amount of cobalt species in the MnO2 is vital for achieving a balance between high performance and durable cycling. 2020 Journal Article http://hdl.handle.net/20.500.11937/91960 10.1002/celc.202001419 English https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 http://purl.org/au-research/grants/arc/DP200103332 http://purl.org/auresearch/grants/arc/DP200103315 http://purl.org/au-research/grants/arc/LE0775553 http://purl.org/au-research/grants/arc/LE0775551 WILEY-V C H VERLAG GMBH unknown |
| spellingShingle | Science & Technology Physical Sciences Electrochemistry zinc-air battery oxygen reduction reaction oxygen evolution reaction oxygen defect manganese oxide REDUCTION REACTION ELECTROCATALYTIC ACTIVITY BIFUNCTIONAL CATALYSTS PEROVSKITE OXIDES MNO2 PERFORMANCE EVOLUTION VACANCIES NANOPARTICLES MORPHOLOGY Zhong, Yijun Dai, J. Xu, Xiaomin Su, Chao Shao, Zongping Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries |
| title | Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries |
| title_full | Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries |
| title_fullStr | Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries |
| title_full_unstemmed | Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries |
| title_short | Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries |
| title_sort | facilitating oxygen redox on manganese oxide nanosheets by tuning active species and oxygen defects for zinc-air batteries |
| topic | Science & Technology Physical Sciences Electrochemistry zinc-air battery oxygen reduction reaction oxygen evolution reaction oxygen defect manganese oxide REDUCTION REACTION ELECTROCATALYTIC ACTIVITY BIFUNCTIONAL CATALYSTS PEROVSKITE OXIDES MNO2 PERFORMANCE EVOLUTION VACANCIES NANOPARTICLES MORPHOLOGY |
| url | https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419 http://hdl.handle.net/20.500.11937/91960 |