不同形貌MoS2电催化剂的制备及其析氢性能  

Preparation of MoS2 electrocatalyst with different morphologies and catalytic performance of hydrogen evolution reaction

作　　者：李渊[1,2] 唐佳莹 初园园[1,2] 谭小耀[1,2] LI Yuan;TANG Jia-ying;CHU Yuan-yuan;TAN Xiao-yao(State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China;School of Chemistry and Chemical Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387 [2]天津工业大学化学与化工学院,天津300387

出　　处：《天津工业大学学报》2021年第1期31-35,共5页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(21206124);天津市自然科学基金资助项目(17JCQNJC06500)。

摘　　要：为了提高二硫化钼催化水电解析氢的性能,采用钼酸铵和还原性磷钼酸铵(rPOM)两种不同的钼源,以硫代乙酰胺为硫源,制备片状和花球状两种形貌的MoS2电催化剂,并通过物理表征与电化学分析,考察了其水电解析氢的性能。结果表明:与片状MoS2相比,花球状MoS2具有较低的过电位(在交流密度为10 mA/cm2时的过电位为287 mV)和较小的Tafel斜率(96.2 mV/dec),经过2000圈循环后,花球状MoS2仅存在微小的电位衰减,展现出较好的稳定性和耐久性;而选用纳米尺度的rPOM作为模板得到的花球状MoS2,其尺寸小,易于暴露更多的终端硫原子,从而增加了催化剂活性位点数量,提高了本征催化性能。In order to improve the performance of molybdenum disulphide catalytic hydrogen evolution reaction,ammonium molybdate and reduced polyoxometalates(rPOM)were used as molybdenum sources,and thioacetamide was used as the sulfur source to prepare molybdenum disulphide sheet and molybdenum disulphide flower-ball.Through physical characterization and electrochemical test,the hydrogen evolution performance was investigated.The results showed that compared with MoS2 sheet,the MoS2 flower-ball has a lower overpotential(287 mV of 10 mA/cm2)and a smaller Tafel slope(96.2 mV/dec).After 2000 cycles,the current density of MoS2 flower-ball only slightly decreased,which shows good stability and durability.The shape of MoS2 flower-ball is conducive to exposing more terminal S atoms,and the size of MoS2 flower-ball is much smaller than that of MoS2 sheet through employing the nano-scale rPOM as the template,which leads to the exposure of active sites and the boost of catalytic performance of hydrogen evolution reaction.

关 键 词：二硫化钼 还原性磷钼酸铵 硫边缘位点 尺寸小 析氢反应 

分 类 号：O646[理学—物理化学]