无定形MoSx薄膜的电化学制备及其电催化析氢性能研究
首发时间:2018-11-12
摘要:MoS2是一种很有前景的电催化析氢材料,常用的制备方法对实验条件比较苛刻,一般需要高温,且反应时间较长,通常还会涉及有毒试剂的使用。电化学沉积是一种简便可行的材料制备方法,本文采用循环伏安法,在水相中,以(NH4)2MoS4为前驱体溶液,钛片为基底,制备无定形MoSx薄膜,并运用传统的三电极体系研究了无定形MoSx薄膜的电解水析氢催化性能。利用场发射扫描电子显微镜(FE-SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)等手段对样品进行了表征。结果表明,通过循环伏安电化学沉积方法成功制备了由纳米颗粒紧密堆积的无定形MoS3薄膜,其表现出了良好的电催化析氢性能,在0.5M H2SO4溶液中,-10mA cm-2时的过电位约为210mV(vs RHE),塔菲尔斜率约为42mV decade-1,电化学活性比表面积为6μF cm-2。
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Electrochemical fabrication and hydrogen evolution catalytic Properties of amorphous Molybdenum Sulfide films
Abstract:MoS2 is a well-know promising electrocatalytic material for hydrogen evolution reaction(HER). Nevertheless, the commonly used preparation methods are harsh to experimental conditions, generally requiring high temperature, lengthy duration, and usually involving the use of toxic reagents. The electrochemical deposition is a simple and feasible method to prepare materials. In this paper, amorphous MoSx films were prepared on titanium support by cyclic voltammetry method, using (NH4)2MoS4 as the precursor solution in water phase. The traditional three-electrode system was adopted to research the electrocatalytic performance for HER. The samples were characterized by FE-SEM, XRD and XPS. The results indicated that the amorphous MoS3 films of densely packed nanoparticles were successfully prepared by cyclic voltammetry method. The films showed high activity for the HER, which owned an overpotential of ~200mV (vs RHE) at a current density of -10mA cm-2 and a Tafer slope of ~48mV decade-1 in 0.5M H2SO4. Cdl is 6μF cm-2.
Keywords: amorphous Molybdenum Sulfide electrochemical deposition hydrogen evolution reaction
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无定形MoSx薄膜的电化学制备及其电催化析氢性能研究
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