Mesoporous nickel-iron binary oxide nanorods for efficient electrocatalytic water oxidation

被引:57
|
作者
Liu, Guang [1 ]
Gao, Xusheng [1 ]
Wang, Kaifang [1 ]
He, Dongying [1 ]
Li, Jinping [1 ]
机构
[1] Taiyuan Univ Technol, Res Inst Special Chem, Taiyuan 030024, Peoples R China
基金
中国国家自然科学基金;
关键词
water splitting; oxygen evolving; electrocatalytic; Ni-Fe binary oxide; nanorods; OXYGEN EVOLUTION REACTION; LAYERED DOUBLE HYDROXIDE; FACILE SYNTHESIS; IN-SITU; REDUCTION; CATALYSTS; HYDROGEN; CO3O4; NI;
D O I
10.1007/s12274-016-1398-x
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The design and fabrication of low-cost, high-efficiency, and stable oxygen-evolving catalysts are essential for promoting the overall efficiency of water electrolysis. In this study, mesoporous Ni1-xFexOy (0 <= x <= 1, 1 <= y <= 1.5) nanorods were synthesized by the facile thermal decomposition of Ni-Fe-based coordination polymers. These polymers passed their nanorod-like morphology to oxides, which served as active catalysts for oxygen evolution reaction (OER). Increasing the Fe-doping amount to 33 at.% decreased the particle size and charge-transfer resistance and increased the surface area, resulting in a reduced overpotential (similar to 302 mV) at 10 mA/cm(2) and a reduced Tafel slope (similar to 42 mV/dec), which were accompanied by a far improved OER activity compared with those of commercial RuO2 and IrO2 electrocatalysts. At Fe-doping concentrations higher than 33 at.%, the trend of the electrocatalytic parameters started to reverse. The shift in the dopant concentration of Fe was further reflected in the structural transformation from a NiO (< 33 at.% Fe) rock-salt structure to a biphasic NiO/NiFe2O4 (33 at.% Fe) heterostructure, a NiFe2O4 (66 at.% Fe) spinel structure, and eventually to alpha-Fe2O3 (100 at.% Fe). The efficient water-oxidation activity is ascribed to the highly mesoporous one-dimensional nanostructure, large surface area, and optimal amounts of the dopant Fe. The merits of abundance in the Earth, scalable synthesis, and highly efficient electrocatalytic activity make mesoporous Ni-Fe binary oxides promising oxygen-evolving catalysts for water splitting.
引用
收藏
页码:2096 / 2105
页数:10
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