Manyepedza Tshiamo, Courtney James M, Snowden Abigail, Jones Christopher R, Rees Neil V
School of Chemical Engineering, University of Birmingham, Edgbaston, BirminghamB15 2TT, United Kingdom.
J Phys Chem C Nanomater Interfaces. 2022 Oct 27;126(42):17942-17951. doi: 10.1021/acs.jpcc.2c06055. Epub 2022 Oct 18.
MoS materials have been extensively studied as hydrogen evolution reaction (HER) catalysts. In this study nanoparticulate MoS is explored as a HER catalyst through impact voltammetry. The onset potential was found to be -0.10 V (vs RHE) at pH 2, which was confirmed to be due to HER by scale-up of the impact experiment to generate and collect a sufficient volume of the gas to enable its identification as hydrogen via gas chromatography. This is in contrast to electrodeposited MoS, which was found to be stable in pH 2 sulfuric acid solution with an onset potential of -0.29 V (vs RHE), in good agreement with literature. XPS was used to categorize the materials and confirm the chemical composition of both nanoparticles and electrodeposits, with XRD used to analyze the crystal structure of the nanoparticles. The early onset of HER was postulated from kinetic analysis to be due to the presence of nanoplatelets of about 1-3 trilayers participating in the impact reactions, and AFM imaging confirmed the presence of these platelets.
硫化钼材料作为析氢反应（HER）催化剂已得到广泛研究。在本研究中，通过冲击伏安法探索了纳米颗粒硫化钼作为HER催化剂的性能。在pH值为2时，起始电位为-0.10 V（相对于可逆氢电极），通过扩大冲击实验规模以产生和收集足够体积的气体，从而能够通过气相色谱法将其鉴定为氢气，证实了这是由析氢反应引起的。这与电沉积的硫化钼形成对比，电沉积的硫化钼在pH值为2的硫酸溶液中是稳定的，起始电位为-0.29 V（相对于可逆氢电极），与文献报道相符。X射线光电子能谱（XPS）用于对材料进行分类并确认纳米颗粒和电沉积物的化学成分，X射线衍射（XRD）用于分析纳米颗粒的晶体结构。动力学分析推测析氢反应的早期起始是由于存在约1 - 3个三层的纳米片参与冲击反应，原子力显微镜（AFM）成像证实了这些薄片的存在。
