电化学置换反应制备Nb_(2)CT_(x)负载低Pt催化剂及其在酸性和中性介质中析氢性能研究  

Preparation of Nb_(2)CT_(x)MXene supported low-Pt catalyst through galvanic replacement reaction and its hydrogen evolution performance in both acidic and neutral media

作　　者：向煜 董梦飞 刘寿达 高晓明[1] 高楼军[1] 姜晨光 闫文科 简选 XIANG Yu;DONG Mengfei;LIU Shouda;GAO Xiaoming;GAO Loujun;JIANG Chenguang;YAN Wenke;JIAN Xuan(School of Chemistry and Chemical Engineering,Yan’an University,Shaanxi Key Laboratory of Chemical Reaction Engineering,Yan’an 716000;Yan’an Key Laboratory of Corrosion Prevention and Thermal Insulation,Tianxin Pipe Technology Group Co.,LTD,Yan’an 717400,China)

机构地区：[1]延安大学化学与化工学院,陕西省化学反应工程重点实验室,陕西延安716000 [2]天信管业科技集团有限公司延安市防腐保温重点实验室,陕西延安717400

出　　处：《延安大学学报（自然科学版）》2023年第4期22-30,共9页Journal of Yan'an University：Natural Science Edition

基　　金：陕西省教育厅重点科学研究计划协同创新项目(23JY084)。

摘　　要：降低催化剂中贵金属Pt含量是构建高性能析氢反应(Hydrogen evolution reaction,HER)电催化剂的关键。通过电化学沉积法将Cu纳米修饰到二维Nb_(2)CT_(x)表面,然后利用电化学置换反应制备得到二维Nb_(2)CT_(x)负载Pt纳米颗粒(PtNP/Nb_(2)CT_(x))催化剂。采用SEM、XRD和XPS等手段对所得催化剂的形貌、结构及组成进行表征,并研究了PtNP/Nb_(2)CT_(x)催化剂在酸性和中性介质中的电催化HER性能。结果表明,在10 m A·cm^(-2)电流密度下,PtNP/Nb_(2)CT_(x)催化剂在0.5 mol·L^(-1)H2SO4和1.0 mol·L^(-1)PBS电解液中的过电压分别为38 m V和146 m V,Tafel斜率分别为42和64 m V·dec^(-1);在0.5 mol·L^(-1)H2SO4中,过电压为50 m V下,催化剂的质量活性和转换频率值分别为36.5 A·mgPt^(-1)和11.5 s^(-1);在1.0 mol·L^(-1)PBS中,过电压为100 m V下,催化剂质量活性和转换频率分别为4.1 A·mgPt^(-1)和4.2 s^(-1),PtNP/Nb_(2)CT_(x)催化剂表现出优异的HER活性。最后在电流密度为10 m A·cm^(-2)下,0.5 mol·L^(-1)H2SO4和1.0 mol·L^(-1)PBS电解液中通过计时电流法进行5 h的稳定性测试,该催化剂均表现出良好的稳定性。该催化剂的成功合成为制备低Pt含量高性能电催化析氢材料提供了新的思路和研究方法。Reducing the content of precious metal Pt in catalyst is the key to producing high-performance hydrogen evolution reaction(HER)electrocatalyst.The PtNP/Nb_(2)CT_(x)catalyst were prepared through electrodeposited Cu nanoparticles on the surface of two-dimensional Nb_(2)CT_(x)and galvanic replacement reaction.The morphology,structure,and composition of the as-prepared PtNP/Nb_(2)CT_(x)catalyst were characterized by SEM,XRD and XPS.The HER performance of PtNP/Nb_(2)CT_(x)catalyst were studied in acidic and neutral media.The results showed that at the cur⁃rent density of 10 mA‧cm^(-2),the overvoltage of the PtNP/Nb_(2)CT_(x)catalyst in 0.5 mol‧L^(-1)H2SO4 and 1.0 mol‧L^(-1)PBS electrolyte was 38 and 146 mV,and the Tafel slope was 42 and 64 mV dec−1,respectively.At the overvoltage of 50 and 100 mV the mass activity and conversion frequency values were 36.5 A‧mgPt^(-1)and 11.5 s^(-1)(0.5 mo‧L^(-1)H2SO4)and 4.1 A‧mgPt^(-1)and 4.2 s^(-1)(1.0 mol‧L^(-1)PBS),respectively.Finally,the stability of the PtNP/Nb_(2)CT_(x)catalyst was tested for 5 h in 0.5 mol‧L^(-1)H2SO4 and 1.0 mol‧L^(-1)PBS electrolytes at a current density of 10 mA‧cm^(-2)by chronoamperometry method,and both exhibited good stability.The successful synthesis of the catalyst provides a new idea and research method for the preparation of high-performance Pt-based electrocatalytic hydrogen evolution materials.

关 键 词：电化学置换反应 二维Nb_(2)CT_(x)MXene Pt基催化剂 电催化 析氢反应 

分 类 号：TQ151.1[化学工程—电化学工业]