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Synthesis of 1D to 3D nanostructured NiCo2S4 on nickel foam and their application in oxygen evolution reaction

Yaqiong GongState Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, ChinaJinlei WangFujian Institute of Research on the Structure of MatterYu LinChemical Engineering and Technology Institute, North University of China, Taiyuan, Shanxi 030051, ChinaZhi YangChemical Engineering and Technology Institute, North University of China, Taiyuan, Shanxi 030051, ChinaHailong PanChemical Engineering and Technology Institute, North University of China, Taiyuan, Shanxi 030051, ChinaZhoufeng XuChemical Engineering and Technology Institute, North University of China, Taiyuan, Shanxi 030051, China

2019en

ABI

Annotatsiya

Design of highly efficient, stable and low-cost water oxidation electrocatalysts continues to be a great impetus and significant challenge for renewable energy systems. In this paper, four diverse morphologies of NiCo2S4 including one-dimensional nanoneedles, two-dimensional nanosheets, three-dimensional flower-like and caterpillar-like arrays are direct grown on nickel foam via a facile two-step hydrothermal process. Influences of synthesis conditions on forming process, morphology, constitution and properties are discussed in detail. Results show that caterpillar-like NiCo2S4 catalyst displays the best electrocatalytic activity toward oxygen evolution reaction, which only needs an overpotential of 279 mV to deliver a current density of 50 mA·cm−2 and the Tafel slope is 68 mV/dec in 1 M KOH. Furthermore, caterpillar-like NiCo2S4 demonstrates excellent stability with inappreciable change of current density after 20 h of oxygen release. This work provides a wide range of possibilities for the further development of cost-effective high efficient electrocatalyst towards oxygen evolution reaction.

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DOI: 10.1016/j.apsusc.2019.01.100

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