Mo_(2)C/MXene@NC复合材料的制备及电解水制氢性能  

Preparation of Mo_(2)C/MXene@NC composites and its performance for hydrogen production by electrolytic water

作　　者：李嫚嫚 陆岩 杨佳宁 胡乃轩 陆远航 庞欣鑫 彭邦华[1] LI Manman;LU Yan;YANG Jianing;HU Naixuan;LU Yuanhang;PANG Xinxin;PENG Banghua(School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering,Shihezi University,Shihezi,Xinjiang 832003,China)

机构地区：[1]石河子大学化学化工学院/化工绿色过程省部共建国家重点实验室培育基地,新疆石河子832003

出　　处：《石河子大学学报（自然科学版）》2024年第6期661-669,共9页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(21663023)。

摘　　要：开发低成本、高性能的析氢反应(HER)电催化剂是实现电解水制氢规模化的关键。本文以MXene(Ti_(3)C_(2)T_(x))为导电基底,以2-甲基咪唑和钼酸铵为原材料,通过室温溶液沉积制备出Mo-MOF/MXene前驱体,然后在Ar气氛下退火制得Mo_(2)C/MXene@NC复合催化材料。SEM和TEM表征结果表明MXene具有层状结构,大的比表面积为Mo_(2)C纳米点在MXene表面均匀分散提供了基础,且进一步增加了活性位点,同时Mo_(2)C与导电性优良的MXene强耦合,调节了复合材料的电子结构,促进电子的转移,从而提升了催化性能。另外,Mo-MOF在MXene表面的原位沉积及转化的NC材料也确保了MXene结构在高温下的稳定性。实验结果显示,在600℃温度下制备的Mo_(2)C/MXene@NC催化剂,在1 mol·L^(-1)KOH溶液中显现出了优异的HER性能,在电流密度为10 mA cm^(-2)时的过电位为210 mV,Tafel斜率为180 mV dec^(-1),并能在16 h内保持催化剂性能的稳定性。本实验不仅提供了一种高活性钼基HER催化剂的制备策略,而且为高温合成MXene基纳米复合材料开辟了途径。The development of low-cost,high-performance hydrogen evolution reaction(HER)electrocatalysts is the key to achieve large-scale hydrogen production by water electrolysis.In this paper,Mo_(2)C/MXene@NC composites were prepared by solution deposition at room temperature with MXene(Ti_(3)C_(2)T_(x))as the conductive substrate,2-methylimidazole and ammonium molybdate as the raw materials,and then the precipitates were annealed in Ar atmosphere to obtain Mo_(2)C/[e-mail] characterization results show that Mo_(2)C nanodots are uniformly dispersed on the MXene surface,where MXene provides a larger specific surface area,Mo_(2)C increases the active sites,and the strong coupling between Mo_(2)C and the conductive MXene regulates the electronic structure to accelerate the electron transfer.In addition,Mo-MOF in-situ formed on MXene maintains the structural stability of MXene at high carbonization temperature.The experimental results indicate that Mo_(2)C/MXene@NC catalyst prepared at 600℃shows excellent HER performance in 1 mol·L^(-1)KOH solution and long term stability over 16 h,with an overpotential of 210 mV at 10 mA cm^(-2)and the smallest Tafel slope of 180 mV dec^(-1).This experiment not only provides a high activity HER Mo-based catalyst preparation strategy,but also opens up a way for high temperature synthesis of MXene-based nanocomposites.

关 键 词：Mo-MOF MXene 电催化 析氢反应 

分 类 号：TB332[一般工业技术—材料科学与工程]