铜、钴、铁掺杂对二硫化钼电催化析氢性能的影响  

Effect of Cu,Co and Fe doping on electrocatalytic hydrogen evolution of MoS_(2)

作　　者：胡陈艳 陈联国 Hu Chenyan;Chen Lianguo(School of Chemistry and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China)

机构地区：[1]武汉工程大学化学与环境工程学院,武汉430205 [2]中国科学院水生生物研究所,武汉430072

出　　处：《河南师范大学学报（自然科学版）》2024年第5期67-73,共7页Journal of Henan Normal University(Natural Science Edition)

基　　金：国家自然科学基金(31971236);武汉工程大学科学研究基金(K202251).

摘　　要：二硫化钼(MoS_(2))作为有望替代贵金属铂,进行电催化析氢反应(HER)的良好催化剂,其性能受到自身活性位点密度的限制.采用一步水热法合成不同过渡金属铜(Cu)、钴(Co)、和铁(Fe)掺杂的花形MoS_(2),并利用场发射扫描电子显微镜(FESEM)、X-射线衍射仪(XRD)及X-射线光电子能谱分析仪(XPS)对所合成样品进行结构表征,电化学测试考察不同过渡金属掺杂的MoS_(2)电催化产氢性能.结果显示,摩尔分数为0.50%的3种过渡金属掺杂对MoS_(2)的形貌和晶体结构均没有明显影响,但Cu和Co掺杂可以显著提高MoS_(2)的电催化析氢效果,表现为MoS_(2)析氢过电位及Tafel斜率的降低,原因可能在于Cu和Co掺杂能减小MoS_(2)电化学析氢过程的电荷转移阻力.进一步对Cu和Co的掺杂量进行优化,结果表明摩尔分数为0.75%的Cu和1.00%的Co分别为最佳量,且制备所得材料0.75%Cu@MoS_(2)和1%Co@MoS_(2)在电催化析氢反应中具有一定的稳定性.As a potential candidate to replace noble metal Pt for electrocatalytic hydrogen evolution reaction(HER),MoS_(2)shows the performance limit in its active site density.In this work,one step hydrothermal synthesis was employed to prepare different transition metal(Cu,Co,Fe)doped flower-like MoS_(2).Meanwhile,FESEM,XRD,XPS technologies were used to characterize the as-prepared materials,and electrochemical measurement was conducted to examine their HER properties.The results show that doping of 0.50%(molar fraction)transition metal in MoS_(2)had no obvious influence on its morphology and phase structure.However,Cu and Co doping could significantly enhance the HER activities of MoS_(2),exhibiting the reduced overpotential and Tafel slope.The possible reason could be the decreased charge transfer resistance during the HER process,as a result of the Cu and Co doping.The further optimization of the doping amounts of Cu and Co showed that 0.75%Cu and 1.00%Co(molar fraction)were their individual best concentrations for improving the HER performance of MoS_(2),and thereby obtaining materials(0.75%Cu@MoS_(2)and 1%Co@MoS_(2))displayed good stability in HER reaction.

关 键 词：过渡金属掺杂 电催化析氢 二硫化钼 

分 类 号：O643.36[理学—物理化学]