Engineering Fe-N Electronic Structure with Adjacent Co-NC and Co Nanoclusters on Carbon Nanotubes for Efficient Oxygen Electrocatalysis

Overview

Journal Nanomicro Lett

Publisher Springer

Date 2023 Oct 20

PMID 37861885

Authors

Mingjie Wu

Xiaohua Yang

Xun Cui

Ning Chen

Lei Du

Mohamed Cherif

Fu-Kuo Chiang

Yuren Wen

Amir Hassanpour

Francois Vidal

Sasha Omanovic

Yingkui Yang

Shuhui Sun

Gaixia Zhang

Affiliations

Soon will be listed here.

Abstract

Regulating the local configuration of atomically dispersed transition-metal atom catalysts is the key to oxygen electrocatalysis performance enhancement. Unlike the previously reported single-atom or dual-atom configurations, we designed a new type of binary-atom catalyst, through engineering Fe-N electronic structure with adjacent Co-NC and nitrogen-coordinated Co nanoclusters, as oxygen electrocatalysts. The resultant optimized electronic structure of the Fe-N active center favors the binding capability of intermediates and enhances oxygen reduction reaction (ORR) activity in both alkaline and acid conditions. In addition, anchoring M-N-C atomic sites on highly graphitized carbon supports guarantees of efficient charge- and mass-transports, and escorts the high bifunctional catalytic activity of the entire catalyst. Further, through the combination of electrochemical studies and in-situ X-ray absorption spectroscopy analyses, the ORR degradation mechanisms under highly oxidative conditions during oxygen evolution reaction processes were revealed. This work developed a new binary-atom catalyst and systematically investigates the effect of highly oxidative environments on ORR electrochemical behavior. It demonstrates the strategy for facilitating oxygen electrocatalytic activity and stability of the atomically dispersed M-N-C catalysts.

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