摘要
氢能作为低碳和零碳能源,是未来国家能源体系的重要组成部分,开发高效、低廉的碱性析氢(HER)电催化剂对于氢能的大规模制备和利用具有重要的意义。本文以二维Nb_(2)CT_(x)MXene为载体,通过一步电化学共沉积法在其表面负载MoO_(3)/Ni-NiO异质结构,得到具有优异电催化HER性能的MoO_(3)/NiNiO/Nb_(2)CT_(x)催化材料。采用XRD、SEM和TEM等手段对MoO_(3)/Ni-NiO/Nb_(2)CT_(x)的表面形貌和结构进行表征,发现通过一步电化学共沉积法成功地将MoO_(3)/Ni-NiO异质结构紧密负载于Nb_(2)CT_(x)MXene纳米片表面。在1.0 mol/L KOH电解质中测试其HER性能,在10 mA·cm^(-2)和100 mA·cm^(-2)的电流密度时,MoO_(3)/NiNiO/Nb_(2)CT_(x)表现出较低的过电压,分别为8 mV和201 mV,Tafel斜率为51 mV·dec^(-1);并且在电流密度分别为10 mA·cm^(-2)和50 mA·cm^(-2)下连续电解产氢20 h,活性几乎保持不变,具有优异的碱性HER稳定性。此外,本文还采用工况电化学阻抗谱对不同催化电极材料在过电压从0~220 mV(vs可逆氢电极(RHE))进行HER工况表征,结果表明MoO_(3)/Ni-NiO/Nb_(2)CT_(x)可有效促进水解离过程和活性氢吸附过程,从而提高HER活性。
As a low-and zero-carbon energy source,hydrogen energy is an important part of the future national energy system.The development of an efficient and inexpensive alkaline hydrogen evolution reaction(HER)electrocatalyst is of great significance for the large-scale preparation and utilization of hydrogen energy.In this paper,the MoO_(3)/Ni-NiO/Nb_(2)CT_(x)was prepared by one-step co-electrodeposition method to loaded MoO_(3)/Ni-NiO heterostructure on two-dimensionalNb_(2)CT_(x)MXene,and the obtained MoO_(3)/Ni-NiO/Nb_(2)CT_(x)exhibited excellent HER performance.The XRD,SEM and TEM were conducted to analyze the surface morphology and structure of the catalysts.Results demonstrate that the MoO_(3)/Ni-NiO heterostructure were successfully electrodeposited on the surface of Nb_(2)CT_(x)MXene nanosheets.The results of HER tests in 1.0 mol/L KOH electrolyte show that the MoO_(3)/Ni-NiONb_(2)CT_(x)at current densities of 10 and 100 mA·cm^(-2)has small overpotentials of 8 and 201 mV,respectively,and Tafel plot is 51 mV·dec^(-1).The MoO_(3)/Ni-NiONb_(2)CT_(x)also has good catalytic stability with almost no detectable activity decay after 20 h HER test at current densities of 10 and 50 mA·cm^(-2),respectively.Besides,the operando electrochemical impedance spectroscopy measurements were used to estimate electrocatalytic HER kinetics of different catalysts at overpotential from 0 to 220 mV(vs reversible hydrogen electrode(RHE),which indicating the MoO_(3)/Ni-NiONb_(2)CT_(x)can effectively promote hydrolysis dissociation process and active hydrogen adsorption process,thus improving HER activity.
作者
刘寿达
刘娟娟
刘潞潞
董梦飞
李瑞
高晓明
高楼军
简选
LIU Shouda;LIU Juanjuan;LIU Lulu;DONG Mengfei;LI Rui;GAO Xiaoming;GAO Loujun;JIAN Xuan(Shaanxi Key Laboratory of Chemical Reaction Engineering,College of Chemistry and Chemical Engineering,Yan'an University,Yan'an 716000,China;College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第5期2546-2558,共13页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(22008167)
陕西省大学生创新创业训练项目(S202210719065)。
