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Wang C, Wang T, Liu Q, Jia W, Han X, Wu D. Starch-based porous carbon microsphere composited NiCo 2O 4 nanoflower as bifunctional electrocatalyst for zinc-air battery. Int J Biol Macromol 2023; 241:124604. [PMID: 37116841 DOI: 10.1016/j.ijbiomac.2023.124604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 04/11/2023] [Accepted: 04/21/2023] [Indexed: 04/30/2023]
Abstract
It is significant to explore and design outstanding bifunctional oxygen electrocatalysts to promote the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in zinc-air batteries. Herein, a novel porous carbon microspheres (CMS2) modified by NiCo2O4 nanoflower (CMS2-NiCo2O4) has been prepared as an ORR and OER catalyst. The hierarchical porous structure of CMS provides high conductivity and abundant active sites for ORR, whereas the synergistic effect of NiCo2O4 nanosheets and a small amount of FeZn oxides act as the positive phase for OER. The efficient oxygen catalytic activity is gained by creating a coupling interface between NiCo2O4 and CMS. The optimized CMS2-NiCo2O4 shows a half-wave potential of 0.82 V toward ORR and an overpotential of 392 mV toward OER. Particularly, CMS2-NiCo2O4 also exhibits an excellent peak power density (175.5 mW cm-2) as a catalyst for zinc-air batteries, which is superior to the commercial Pt/C + RuO2 catalyst (120.5 mW cm-2), and it also demonstrates a remarkable stability even after the charge-discharge cycles of 167 h. The prepared CMS2-NiCo2O4 is promising for the application of the bimetallic oxide catalyst for zinc-air battery.
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Affiliation(s)
- Caige Wang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China
| | - Tao Wang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Physics and Chemistry Analysis Center, Xinjiang University, Urumqi 830046, China
| | - Qian Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China
| | - Wei Jia
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
| | - Xiaofeng Han
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China
| | - Dongling Wu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
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Liu K, Zhang W, Tang M, Wang Z, Yang Y, Li S, Long H. NiCo2O4 nanosheet stereostructure with N-doped carbon/Co array supports derived from Co-MOF for asymmetric supercapacitor. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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