Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
ARC Centre of Excellence for Functional Nanomaterials, Institute for Frontier Materials, Deakin University , Waurn Ponds, Victoria 3216, Australia.
ACS Appl Mater Interfaces. 2016 Feb 10;8(5):3543-50. doi: 10.1021/acsami.5b08816. Epub 2016 Jan 27.
Electrochemically splitting water for hydrogen evolution reaction (HER) has been viewed as a promising approach to produce renewable and clean hydrogen energy. However, searching for cheap and efficient HER electrocatalysts to replace the currently used Pt-based catalysts remains an urgent task. Herein, we develop a one-step carbon nanotube (CNT) assisted synthesis strategy with CNTs' strong adsorbability to mediate the growth of subnanometer-sized MoS(x) on CNTs. The subnanometer MoS(x)-CNT hybrids achieve a low overpotential of 106 mV at 10 mA cm(-2), a small Tafel slope of 37 mV per decade, and an unprecedentedly high turnover frequency value of 18.84 s(-1) at η = 200 mV among all reported non-Pt catalysts in acidic conditions. The superior performance of the hybrid catalysts benefits from the presence of a higher number of active sites and the abundant exposure of unsaturated S atoms rooted in the subnanometer structure, demonstrating a new class of subnanometer-scale catalysts.
电化学水分解制氢反应 (HER) 被认为是生产可再生清洁能源氢气的一种很有前途的方法。然而，寻找廉价高效的 HER 电催化剂来替代目前使用的 Pt 基催化剂仍然是一项紧迫的任务。在此，我们开发了一种一步碳纳米管 (CNT) 辅助合成策略，利用 CNTs 的强吸附性来调节亚纳米级 MoS(x) 在 CNTs 上的生长。亚纳米 MoS(x)-CNT 杂化物在酸性条件下，在 10 mA cm(-2)的电流密度下，过电位仅为 106 mV，塔菲尔斜率为 37 mV/decade，在 η = 200 mV 时的周转频率值高达 18.84 s(-1)，在所有报道的非 Pt 催化剂中表现出前所未有的优异性能。这种混合催化剂的优异性能得益于具有更多的活性位和丰富的不饱和 S 原子暴露在亚纳米结构中，证明了一类新的亚纳米尺度催化剂。
