title: Cobalt-Doped FeSe2-RGO as Highly Active and Stable Electrocatalysts for Hydrogen Evolution Reactions.
abstract: 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.
authors.affiliation: Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Xu
authors.affiliation: Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
authors.forename: Yuancai
authors.initials: Y
authors.lastname: Ge
authors.affiliation: Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
authors.forename: Man
authors.initials: M
authors.lastname: Wang
authors.affiliation: Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
authors.forename: Zhuqing
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Pei
authors.initials: P
authors.lastname: Dong
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Robert
authors.initials: R
authors.lastname: Baines
authors.affiliation: Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
authors.forename: Mingxin
authors.initials: M
authors.lastname: Ye
authors.affiliation: Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Shen
keywords: FeSe2; electrocatalysis; hybrid catalyst; hydrogen evolution reaction; water splitting