Chua Xing Juan, Tan Shu Min, Chia Xinyi, Sofer Zdenek, Luxa Jan, Pumera Martin
Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28, Prague 6, Czech Republic.
Chemistry. 2017 Mar 2;23(13):3169-3177. doi: 10.1002/chem.201605343. Epub 2017 Feb 6.
Molybdenum disulfide (MoS ) is at the forefront of materials research. It shows great promise for electrochemical applications, especially for hydrogen evolution reaction (HER) catalysis. There is a significant discrepancy in the literature on the reported catalytic activity for HER catalysis on MoS . Here we test the electrochemical performance of MoS obtained from seven sources and we show that these sources provide MoS of various phase purity (2H and 3R, and their mixtures) and composition, which is responsible for their different electrochemical properties. The overpotentials for HER at -10 mA cm for MoS from seven different sources range from -0.59 V to -0.78 V vs. reversible hydrogen electrode (RHE). This is of very high importance as with much interest in 2D-MoS , the use of the top-down approach would usually involve the application of commercially available MoS . These commercially available MoS are rarely characterized for composition and phase purity. These key parameters are responsible for large variance of reported catalytic properties of MoS .
二硫化钼（MoS₂）处于材料研究的前沿。它在电化学应用方面展现出巨大潜力，尤其是在析氢反应（HER）催化方面。关于二硫化钼在析氢反应催化方面所报道的催化活性，文献中存在显著差异。在此，我们测试了从七个来源获得的二硫化钼的电化学性能，结果表明这些来源提供了具有不同相纯度（2H和3R及其混合物）和组成的二硫化钼，这导致了它们不同的电化学性质。相对于可逆氢电极（RHE），来自七个不同来源的二硫化钼在-10 mA cm⁻²电流密度下的析氢过电位范围为-0.59 V至-0.78 V。这一点非常重要，因为随着人们对二维二硫化钼的兴趣大增，自上而下的方法通常会涉及使用市售的二硫化钼。这些市售的二硫化钼很少对其组成和相纯度进行表征。而这些关键参数正是导致所报道的二硫化钼催化性能存在巨大差异的原因。
