双功能
硫化镍
纳米片
分解水
析氧
材料科学
镍
电解
化学工程
纳米技术
电极
催化作用
化学
电化学
冶金
电解质
物理化学
生物化学
光催化
工程类
作者
Tengfei Zhang,Dan Xu,Ping Liu,Long Chen,Wen Guo,Tiantian Gu,Feng Ye,Yanyan Liu,Gang Wang
标识
DOI:10.1016/j.jallcom.2023.172530
摘要
The development of economical, efficient, and durable bifunctional catalyst for overall water splitting is an attractive and challenging task. Herein, a novel defect-rich 2D/2D heterostructure is constructed by vertically growing S-doped NiMoO4 (NiMoO4-S) nanosheets on nickel sulfide (Ni3S2) nanosheet arrays supported on nickel foam (NF) using a two-step hydrothermal method. Benefiting from the hierarchical sheet-on-sheet heterogeneous nanostructure and abundant oxygen vacancies for more active sites, efficient electronic/mass transfer, and fast gas release, the synthesized NiMoO4-S/Ni3S2/NF electrode exhibits excellent electrocatalytic performance for HER (η10 mA cm−2 = 107 mV) and OER (η50 mA cm−2 = 285 mV). The alkaline water electrolyzer with NiMoO4-S/Ni3S2/NF as the positive and negative electrodes can provide a current density of 10 mA cm-2 with the potential of 1.52 V, which is below that of the commercial Pt||RuO2/NF system or many other reported systems. More importantly, the alkaline water electrolyzer offers a current density of 100 mA cm-2 at 1.85 V with outstanding durability of over 50 h. This research points to a promising route in designing transition metal-based bifunctional electrocatalysts for large-scale energy conversion applications.
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