Cobalt-Doped FeSe2-RGO as Highly Active and Stable Electrocatalysts for Hydrogen Evolution Reactions

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• 作者：Xiaowei Xu ; Yuancai Ge ; Man Wang ; Zhuqing Zhang ; Pei Dong ; Robert Baines ; Mingxin Ye ; Jianfeng Shen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：18036-18042
• 全文大小：556K
• 年卷期：0
• ISSN：1944-8252

文摘

Herein, we describe the preparation and testing of Co-doped FeSe₂ hybridized with graphene (Fe_1–xCo_xSe₂/RGO), a high-active yet stable electrocatalyst for hydrogen evolution reactions (HERs) in acidic solutions. First, we systematically analyze the composition and morphology of Fe_1–xCo_xSe₂/RGO and attribute its excellent electrochemical performance to its unique architecture—a base of highly conductive graphene with fully exposed active edges that enhances conductivity and facilitates ion/electron transfer. Our experimental measurements indicate elevated HER activity with a moderate overpotential of ∼166 mV at a hydrogen production current density of 10 mA cm^–2, a small Tafel slope of ∼36 mV dec^–1, and long cycling lifespan more than 20 h. The promising results, in addition to the fact that Fe_1–xCo_xSe₂/RGO is a high-performance, precious-metal-free electrocatalyst, pave the way for exciting opportunities in renewable hydrogen production applications.