Subnanometer Molybdenum Sulfide on Carbon Nanotubes as a Highly Active and Stable Electrocatalyst for Hydrogen Evolution Reaction

详细信息    查看全文

• 作者：Ping Li ; Zhi Yang ; Juanxia Shen ; Huagui Nie ; Qiran Cai ; Luhua Li ; Mengzhan Ge ; Cancan Gu ; Xi’an Chen ; Keqin Yang ; Lijie Zhang ; Ying Chen ; Shaoming Huang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：8
• 期：5
• 页码：3543-3550
• 全文大小：523K
• ISSN：1944-8252

文摘

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.