Razavi Mina, Sookhakian M, Goh Boon Tong, Bahron Hadariah, Mahmoud Eyas, Alias Y
Department of Chemistry, Faculty of Science, University Malaya Centre for Ionic Liquids, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Nanoscale Res Lett. 2022 Jan 10;17(1):9. doi: 10.1186/s11671-021-03644-6.
Electrochemical hydrogen evolution reaction (HER) refers to the process of generating hydrogen by splitting water molecules with applied external voltage on the active catalysts. HER reaction in the acidic medium can be studied by different mechanisms such as Volmer reaction (adsorption), Heyrovsky reaction (electrochemical desorption) or Tafel reaction (recombination). In this paper, facile hydrothermal methods are utilized to synthesis a high-performance metal-inorganic composite electrocatalyst, consisting of platinum nanoparticles (Pt) and molybdenum disulfide nanosheets (MoS) with different platinum loading. The as-synthesized composite is further used as an electrocatalyst for HER. The as-synthesized Pt/Mo-90-modified glassy carbon electrode shows the best electrocatalytic performance than pure MoS nanosheets. It exhibits Pt-like performance with the lowest Tafel slope of 41 mV dec and superior electrocatalytic stability in an acidic medium. According to this, the HER mechanism is related to the Volmer-Heyrovsky mechanism, where hydrogen adsorption and desorption occur in the two-step process. According to electrochemical impedance spectroscopy analysis, the presence of Pt nanoparticles enhanced the HER performance of the MoS nanosheets because of the increased number of charge carriers transport.
电化学析氢反应（HER）是指在活性催化剂上通过施加外部电压分解水分子来产生氢气的过程。酸性介质中的HER反应可以通过不同的机理进行研究，如伏尔默反应（吸附）、海洛夫斯基反应（电化学解吸）或塔菲尔反应（复合）。在本文中，采用简便的水热法合成了一种高性能的金属-无机复合电催化剂，该催化剂由铂纳米颗粒（Pt）和不同铂负载量的二硫化钼纳米片（MoS）组成。合成的复合材料进一步用作HER的电催化剂。合成的Pt/Mo-90修饰玻碳电极比纯MoS纳米片表现出最佳的电催化性能。它表现出类似Pt的性能，最低塔菲尔斜率为41 mV dec，在酸性介质中具有优异的电催化稳定性。据此，HER机理与伏尔默-海洛夫斯基机理有关，其中氢吸附和解吸发生在两步过程中。根据电化学阻抗谱分析，Pt纳米颗粒的存在增强了MoS纳米片的HER性能，这是由于电荷载流子传输数量增加所致。
