A Novel Bimetallic Nickel-Molybdenum Carbide Nanowire Array for Efficient Hydrogen Evolution

被引:43
作者
Guo, Lixia [1 ]
Wang, Jianying [1 ]
Teng, Xue [1 ]
Liu, Yangyang [1 ]
He, Xiaoming [1 ]
Chen, Zuofeng [1 ]
机构
[1] Tongji Univ, Sch Chem Sci & Engn, Shanghai Key Lab Chem Assessment & Sustainabil, 1239 Siping Rd, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
carbides; electrocatalysis; hydrogen; nanostructures; nanowire array; HIGH-PERFORMANCE; HIGHLY EFFICIENT; CARBON CLOTH; GRAPHENE OXIDE; PHOSPHIDE NANOPARTICLES; GENERATING HYDROGEN; NANOROD ARRAYS; NI FOAM; ELECTROCATALYSTS; ELECTRODES;
D O I
10.1002/cssc.201801110
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The design and fabrication of noble-metal-free hydrogenevolution electrocatalysts with high activity is significant to future renewable energy systems. In this work, self-supported NiMo carbide nanowires on carbon cloth (Ni3Mo3C@NPC NWs/CC; NPC=N,P-doped carbon) were developed through an electropolymerization-assisted procedure. During the synthesis process, NiMoO4 nanowires were first grown on CC through a hydrothermal reaction that was free of any polymer binder such as Nafion. By use of electropolymerization, the as-prepared NiMoO4 NWs/CC sample was then coated by a layer of polypyrole (PPy) that served as the carbon source for subsequent conversion into Ni3Mo3C@NPC NWs/CC by carbothermal reduction. The experimental results indicated that judicious choices of the amount of coated PPy and the pyrolysis temperature were essential for obtaining the pure-phase, nanowire array structure of Ni3Mo3C@NPC NWs/CC. Benefitting from the pure phase of the bimetallic carbide, the unique architecture of the nanowire array, and its self-supported nature, the optimized Ni3Mo3C@NPC NWs/CC electrode exhibited excellent performance in the hydrogen evolution reaction (HER) in both acidic and alkaline media. Low overpotentials of 161 and 215 mV were required to afford a high current density of 100 mAcm(-2) toward the HER in acidic and alkaline media, respectively, and the catalytic activity was maintained for at least 48h, which puts Ni3Mo3C@NPC NWs/CC among the best HER electrocatalysts based on metallic carbides yet reported.
引用
收藏
页码:2717 / 2723
页数:7
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