析氧
分解水
纳米材料基催化剂
硫化镍
材料科学
催化作用
化学工程
硫系化合物
双功能
镍
电化学
过电位
吉布斯自由能
电催化剂
电池(电)
硫化物
纳米技术
化学
电极
纳米颗粒
光催化
冶金
物理化学
热力学
功率(物理)
工程类
物理
生物化学
作者
Xuerong Zheng,Xiaopeng Han,Yiqi Zhang,Jihui Wang,Cheng Zhong,Yida Deng,Wenbin Hu
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2019-01-01
卷期号:11 (12): 5646-5654
被引量:149
摘要
The exploitation of economical and highly efficient bifunctional electrocatalysts to promote oxygen evolution and hydrogen evolution reactions (OER and HER) for water splitting devices is urgently needed. Herein, a series of NiSx (i.e., NiS, Ni3S2, NiS2) nanocrystals with controllable phase and composition have been synthesized via a facile polyol solution process and the corresponding electrocatalytic properties towards OER and HER have been systematically investigated. Electrochemical results reveal that Ni3S2 exhibits superior OER and HER performance to NiS and NiS2, achieving 1.63 V to reach a current density of 10 mA cm-2 in the overall water splitting device, which is comparable to that of noble metal catalysts. Experimental and theoretical calculation investigations demonstrate that the remarkable catalytic properties of Ni3S2 could be attributed to the intrinsic metallic conductivity, abundant active sites and optimal Gibbs free-energy for catalyst-H* for HER. Moreover, a thicker layer of catalytically active species of NiOOH was generated on the surface of Ni3S2 due to the higher proportion of Ni, leading to a better OER performance. These results should shed light on the design and development of low cost and efficient transition metal chalcogenide electrocatalysts through phase and composition regulation for advanced electrochemical energy conversion devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI