标题：Graphene layer encapsulated MoNi4-NiMoO4 for electrocatalytic water splitting
作者：An, Lihua ;Zang, Xinyue ;Ma, Linzheng ;Guo, Jinxue ;Liu, Qingyun ;Zhang, Xiao
作者机构：[An, Lihua ;Zang, Xinyue ;Guo, Jinxue ;Zhang, Xiao ] Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science, MOE, Key Labo 更多
来源：Applied Surface Science
摘要：Developing active and cheap bifunctional electrocatalysts is crucial and challenging for overall water splitting. This work reports a core-shell structured catalyst supported on nickel foam, which is composed of hybrid MoNi4 alloy and NiMoO4 encapsulated in graphene shell layer. The core catalyst of MoNi4-NiMoO4 supplies robust intrinsic activity and high conductivity. The graphene shell accelerates the charge transfer and provides additional protection for core catalyst. Hence, the present G@MoNi4-NiMoO4/NF exhibits excellent catalytic properties for alkali water splitting, with low overpotentials of 55 mV and 206 mV at 10 mA cm−2 for HER and OER, respectively. The efficient activity for overall water splitting is further demonstrated by a low cell voltage of 1.44 V at 10 mA cm−2 in the bifunctional G@MoNi4-NiMoO4/NF electrodes assembled electrolyzer, showing great promise for practical application.
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