An Isolated Zinc-Cobalt Atomic Pair for Highly Active and Durable Oxygen Reduction.

By Ziyang Lu, Bo Wang, Yongfeng Hu, Wei Liu, Yufeng Zhao, R. Yang, Zhiping Li, Jun Luo, Bin Chi, Zheng Jiang and 5 more. Angewandte Chemie, 2019

621 citations recorded by the source corpus.

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 ).

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/508dbed209ea8b7a58f973817c6d860248528ccd