1. An Isolated Zinc–Cobalt Atomic Pair for Highly Active and Durable Oxygen Reduction.
- Author
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Lu, Ziyang, Wang, Bo, Hu, Yongfeng, Liu, Wei, Zhao, Yufeng, Yang, Ruoou, Li, Zhiping, Luo, Jun, Chi, Bin, Jiang, Zheng, Li, Minsi, Mu, Shichun, Liao, Shijun, Zhang, Jiujun, and Sun, Xueliang
- Subjects
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ELECTROCATALYSTS , *LITHIUM-ion batteries , *NANOPARTICLES , *ELECTROCHEMICAL analysis , *POWER density - Abstract
A competitive complexation strategy has been developed to construct a novel electrocatalyst with Zn‐Co atomic pairs coordinated on N doped carbon support (Zn/CoN‐C). Such architecture offers enhanced binding ability of O2, significantly elongates the O−O length (from 1.23 Å to 1.42 Å), and thus facilitates the cleavage of O−O bond, showing a theoretical overpotential of 0.335 V during ORR process. As a result, the Zn/CoN‐C catalyst exhibits outstanding ORR performance in both alkaline and acid conditions with a half‐wave potential of 0.861 and 0.796 V respectively. The in situ XANES analysis suggests Co as the active center during the ORR. The assembled zinc–air battery with Zn/CoN‐C as cathode catalyst presents a maximum power density of 230 mW cm−2 along with excellent operation durability. The excellent catalytic activity in acid is also verified by H2/O2 fuel cell tests (peak power density of 705 mW cm−2). Discrete zinc/cobalt bimetallic sites were supported on N‐doped carbon (Zn/CoN‐C) through a competitive complexation stretegy. The as‐prepared Zn/CoN‐C catalyst exhibits outstanding ORR performance in both alkaline and acid conditions, and the assembled Zn–air batteries and H2/O2 fuel cell show excellent power density and stability, which demonstrate suitability for practical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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