NiCoP/NiOOH nanoflowers loaded on ultrahigh porosity Co foam for hydrogen evolution reaction under large current density  

作　　者：Yuantao Pei Liang Huang Lei Han Haijun Zhang Longhao Dong Quanli Jia Shaowei Zhang 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan,430081,China [2]Henan Key Laboratory of High Temperature Functional Ceramics,Zhengzhou University,Zhengzhou,450052,China [3]College of Engineering,Mathematics and Physical Sciences,University of Exeter,Exeter,EX44QF,United Kingdom

出　　处：《Green Energy & Environment》2022年第3期467-476,共10页绿色能源与环境（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No 51702241,51672194,and 51872210);Program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province(No.T201602);Key Program of Natural Science Foundation of Hubei Province,China(No.2017CFA004);the Special Project of Central Government for Local Science and Technology Development of Hubei Province(No.2019ZYYD076)。

摘　　要：Developing user-friendly electrodes for efficiently producing hydrogen from water to substitute non-renewable fossil fuels is one of the challenges in the hydrogen energy field.For the first time,we have prepared self-supporting ultrahigh porosity cobalt foam loaded with NiCoP/NiOOH nanoflowers(NiCoP/CF)via freeze-drying and phosphorization.The as-prepared hierarchical NiCoP/CF electrodes showed superior catalytic activity for hydrogen evolution reaction(HER)in alkaline media.The one resulted from phosphorization at 350℃(NiCoP/CF-350)only required overpotential of-47,and-126 mV to deliver geometrical current density of-10 mA cm^(-2) and-100 mA cm^(-2),respectively,demonstrating improved catalytic activity than the electrodes prepared using a commercial nickel foam as a support.Moreover,it could retain its superior stability at a current density higher than-500 mA cm^(-2) for 16 h.Such an outstanding performance can be attributed to the ultrahigh porosity of Co foam support,optimal adsorption energies of HER intermediates(H^(*)),facile water dissociation on the NiCoP/NiOOH heterointerfaces,and the assistance of NiOOH facilitating the electrons transfer from the Co foam inside to the NiCoP outside.The work would provide a new strategy for future design of advanced HER electrocatalysts.

关 键 词：POROSITY loaded attributed 

分 类 号：TQ116.2[化学工程—无机化工] TQ426