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Huang Y, Zhang Y, Hao J, Wang Y, Yu J, Liu Y, Tian Z, Chan TS, Liu M, Li W, Li J. Tuning the coordination environment of Fe atoms enables 3D porous Fe/N-doped carbons as bifunctional electrocatalyst for rechargeable zinc-air battery. J Colloid Interface Sci 2022; 628:1067-1076. [PMID: 36163054 DOI: 10.1016/j.jcis.2022.09.066] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 09/09/2022] [Accepted: 09/11/2022] [Indexed: 10/14/2022]
Abstract
As one of the most promising candidates for power sources, the rechargeable Zn-air batteries have attracted much attention due to their high energy density. However, Zn-air batteries suffer from sluggish kinetics of oxygen reduction (ORR) and oxygen evolution reaction (OER) during the discharge and charge process. Herein, a FeN2-doped carbon with a unique three-dimensional (3D) porous structure (CeO2-FeNC-5) was synthesized as an electrocatalyst for Zn-air batteries by one-step pyrolysis and introducing CeO2 to tune the coordination environment of Fe atoms. Extended X-ray absorption fine structure (EXAFS) results indicate that the introduction of CeO2 can convert FeN3 moieties into FeN2 moieties. The CeO2-FeNC-5 exhibits a more positive half-wave potential of 0.902 V for ORR, and a low overpotential of 0.327 V at 10 mA cm-2 for OER. Furthermore, the Zn-air battery with CeO2-FeNC-5 achieve a maximum power density (169 mW cm-2), a high open voltage platform (1.47 V) and superior cycling stability (200 h). The unique 3D porous structure provides channels for mass transport and exposes sufficient active sites to facilitate the ORR and OER processes. Calculations prove that FeN2 moieties are beneficial to O2 adsorption on Fe/N-doped carbon surface. This work provides an effective strategy for designing and synthesizing FeNx-doped carbon matrix electrocatalysts for sustainable metal-air batteries.
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Affiliation(s)
- Yaling Huang
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Yafei Zhang
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; Changsha Uranium Geology Research Institute, China National Nuclear Corporation, China
| | - Jiayu Hao
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Yanqiu Wang
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Jiawen Yu
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Yang Liu
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Zhongliang Tian
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Min Liu
- School of Physics and Electronics, Central South University, Changsha 410083, China
| | - Wenzhang Li
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; Hunan Provincial Key Laboratory of Chemical Power Sources, Central South University, Changsha 410083, China.
| | - Jie Li
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
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Yang G, Li Y, Yang S, Liao J, Cai X, Gao Q, Fang Y, Peng F, Zhang S. Surface oxidized nano-cobalt wrapped by nitrogen-doped carbon nanotubes for efficient purification of organic wastewater. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.118098] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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