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Type: Journal article
Title: Engineering catalytic active sites on cobalt oxide surface for enhanced oxygen electrocatalysis
Author: Han, X.
He, G.
He, Y.
Zhang, J.
Zheng, X.
Li, L.
Zhong, C.
Hu, W.
Deng, Y.
Ma, T.
Citation: Advanced Energy Materials, 2018; 8(10):1702222-1-1702222-13
Publisher: Wiley-VCH Verlag
Issue Date: 2018
ISSN: 1614-6832
Statement of
Xiaopeng Han, Guowei He, Yu He, Jinfeng Zhang, Xuerong Zheng, Lanlan Li, Cheng Zhong, Wenbin Hu, Yida Deng, and Tian-Yi Ma
Abstract: Tuning the catalytic active sites plays a crucial role in developing low cost and highly durable oxygen electrode catalysts with precious metal‐competitive activity. In an attempt to engineer the active sites in Co₃O₄ spinel for oxygen electrocatalysis in alkaline electrolyte, herein, controllable synthesis of surface‐tailored Co₃O₄ nanocrystals including nanocube (NC), nanotruncated octahedron (NTO), and nanopolyhedron (NP) anchored on nitrogen‐doped reduced graphene oxide (N‐rGO), through a facile and template‐free hydrothermal strategy, is provided. The as‐synthesized Co₃O₄ NC, NTO, and NP nanostructures are predominantly enclosed by {001}, {001} + {111}, and {112} crystal planes, which expose different surface atomic configurations of Co²⁺ and Co³⁺ active sites. Electrochemical results indicate that the unusual {112} plane enclosed Co₃O₄ NP on rGO with abundant Co³⁺ sites exhibit superior bifunctional activity for oxygen reduction and evolution reactions, as well as enhanced metal–air battery performance in comparison with other counterparts. Experimental and theoretical simulation studies demonstrate that the surface atomic arrangement of Co²⁺/Co³⁺ active sites, especially the existence of octahedrally coordinated Co³⁺ sites, optimizes the adsorption, activation, and desorption features of oxygen species. This work paves the way to obtain highly active, durable, and cost‐effective electrocatalysts for practical clean energy devices through regulating the surface atomic configuration and catalytic active sites.
Keywords: Co₃O₄ spinel; controllable synthesis; metal–air batteries; nanocomposite; oxygen electrocatalysis
Description: Published online: December 18, 2017
Rights: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
RMID: 0030085609
DOI: 10.1002/aenm.201702222
Grant ID:
Appears in Collections:Chemical Engineering publications

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