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- Title
An Isolated Zinc–Cobalt Atomic Pair for Highly Active and Durable Oxygen Reduction.
- Authors
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; Sun, Xueliang
- 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).
- Subjects
ELECTROCATALYSTS; CATALYSTS; LITHIUM-ion batteries; NANOPARTICLES; POWER density
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 9, p2648
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201810175