Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
ACS Appl Mater Interfaces. 2016 Jul 20;8(28):18036-42. doi: 10.1021/acsami.6b03849. Epub 2016 Jul 7.
Herein, we describe the preparation and testing of Co-doped FeSe2 hybridized with graphene (Fe1-xCoxSe2/RGO), a high-active yet stable electrocatalyst for hydrogen evolution reactions (HERs) in acidic solutions. First, we systematically analyze the composition and morphology of Fe1-xCoxSe2/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 Fe1-xCoxSe2/RGO is a high-performance, precious-metal-free electrocatalyst, pave the way for exciting opportunities in renewable hydrogen production applications.
在此，我们描述了 Co 掺杂的 FeSe2 与石墨烯（Fe1-xCoxSe2/RGO）的制备和测试，这是一种在酸性溶液中用于析氢反应（HERs）的高活性且稳定的电催化剂。首先，我们系统地分析了 Fe1-xCoxSe2/RGO 的组成和形貌，并将其优异的电化学性能归因于其独特的架构 - 高度导电的石墨烯基底，具有完全暴露的活性边缘，可增强导电性并促进离子/电子转移。我们的实验测量表明，在 10 mA cm(-2)的产氢电流密度下，具有约 166 mV 的适度过电势、约 36 mV dec(-1)的小塔菲尔斜率和超过 20 h 的长循环寿命，具有较高的 HER 活性。除了 Fe1-xCoxSe2/RGO 是一种高性能、无贵金属的电催化剂这一事实外，这些有前景的结果为可再生制氢应用中的令人兴奋的机会铺平了道路。
