Vanadium nitride based CoFe prussian blue analogues for enhanced electrocatalytic oxygen evolution

被引:13
作者
Meng, Kai [1 ,2 ]
Zheng, Zhilin [1 ,3 ]
Cao, Juntai [4 ]
Liu, Lujing [1 ]
Jia, Zhijun [1 ]
Wang, Yi [1 ]
Qi, Tao [1 ]
机构
[1] Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China
[4] Univ British Columbia, Dept Mat Engn, Vancouver, BC V6T 1Z4, Canada
关键词
CoFe Prussian blue analogues; Vanadium nitride; Close contact; Electron interaction; Oxygen evolution reaction; PEROXIDE FUEL-CELL; WATER OXIDATION; EFFICIENT ELECTROCATALYST; NI FOAM; HYDROGEN; SUPERCAPACITORS; NANOSTRUCTURES; CONSTRUCTION; NANOARRAY; NANOCAGES;
D O I
10.1016/j.ijhydene.2020.08.274
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The development of efficient and stable nonprecious-metal catalysts remains a challenge for electrochemical water oxidation in practical applications. Prussian blue analogues (MM'-PBAs, A(x)M(y) [M'(CN)(6)], -nH(2)O: A = alkali metal; M/M' = transition metals), as a kind of potential electrocatalyst candidate for oxygen evolution reaction (OER), are rarely studied. Herein, by a facile coprecipitation method, CoFe-PBAs were in-situ grown on the surface of highly conductive vanadium nitride (VN) particles. The hybrid CoFe-PBAs/VN achieves the amelioration of the poor conductivity of bare CoFe-PBAs and the increase in the density of Co2+ active sites due to electron interaction. Compared with bare CoFe-PBAs (over-potential of 398 mV at 10 mA cm(-2) and Tafel slope of 78.35 mV dec(-1)), the CoFe-PBAsNN manifests a remarkably enhanced electrocatalytic activity for OER (lower overpotential of 290 mV at 10 mA cm(-2) and a smaller Tafel slope of 39.72 mV dec(-1)), which is superior among PBAs and PBAs-derived materials reported as electrocatalysts for OER. Besides, this hybrid material behaves an excellent long-term durability. High conductivity of VN and electron interaction between VN and CoFe-PBAs contribute to the promoted catalytic performance. This study provides a novel strategy using VN substrates to support PBAs-based catalysts so as to obtain highly active and stable electrocatalysts towards practical applications. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:31410 / 31417
页数:8
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