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Catalysis in Electrochemical Water Splitting

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Front. Chem. | doi: 10.3389/fchem.2018.00580

Co2P Nanoparticles Wrapped in Amorphous Porous Carbon as An Efficient and Stable Catalyst for Water Oxidation

 Zunjian Ke1, Haojie Wang2, Dong He1, Xianyin Song1, Chongyang Tang1, Jiangchao Liu1, Lanli He1,  Xiangheng Xiao1* and Changzhong Jiang1
  • 1School of Physical Science and Technology, Wuhan University, China
  • 2Institute of Solid State Physics, Hefei Institutes of Physical Science (CAS), China

Exploring highly active, enduringly stable, and low-cost oxygen evolution reaction catalysts continues to be a dominant challenge to commercialize renewable electrochemical water-splitting technology. High-active and earth-abundant cobalt phosphides are recently considered as promising candidates. However, the poor inherent electron transfer efficiency and instability hinder its further development. In this work, a novel approach was demonstrated to effectively synthesize Co2P nanoparticles wrapped in amorphous porous carbon framework (Co2P/C). Benefiting from extremely high specific surface area of porous carbon, plenty of active sites were adequately exposed. Meanwhile, unique anchoring structure between Co2P nanoparticles and amorphous carbon outerwear insured high transfer efficiency and superior stability of Co2P/C. Due to these favorable properties, low overpotential of 281 mV at 10 mA cm-2 and Tafel slope of 69 mV dec-1 were achieved in resultant Co2P/C catalyst. More significantly, it only exhibited a negligible overpotential increase after 30 hours stability test, and these performance entirely preceded commercial RuO2 benchmark. In summary, we proposed a simple and feasible strategy to prepare metal phosphides wrapped with amorphous porous carbon outerwear for efficient and durable electrochemical water oxidation.

Keywords: Oxygen Evolution reaction, Electrocatalysis, Dicobalt phosphide, Amorphous porous carbon, Anchoring structure, Transfer resistance

Received: 29 Sep 2018; Accepted: 06 Nov 2018.

Edited by:

Ping Xu, Harbin Institute of Technology, China

Reviewed by:

Jingyu Wang, Huazhong University of Science and Technology, China
Gongming Wang, University of Science and Technology of China, China  

Copyright: © 2018 Ke, Wang, He, Song, Tang, Liu, He, Xiao and Jiang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Xiangheng Xiao, School of Physical Science and Technology, Wuhan University, Wuhan, Hubei Province, China, xxh@whu.edu.cn