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| Hydrothermal preparation of MnO2/NiCo2O4 nanocomposite coating on stainless steel and analysis of its structure and hydrogenation properties |
| WU Chang-you1，LIU Jun-chao2，HE Wen3， |
| 1 Department of Mechanical Engineering,Kaifeng Institute of Technicians,?Kaifeng 475000 China，2 Department of Mechanical Engineering,Puyang Institute of Technicians, Puyang 457000, China，3 Shenzhen Aomeite Technology Co., Ltd., Shenzhen 518000, China |
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Abstract MnO2, NiCo2O4 and MnO2/NiCo2O4 nano-films were prepared on stainless steel substrates by hydrothermal method. SEM, XRD, TEM analysis were carried out, and their hydrogen evolution effects were characterized electrochemically. The results show that MnO2 nano-materials form a uniform distribution on the surface of stainless steel and have a petal-shaped stacked structure. NiCo2O4 nano-materials are in vertical form, showing obvious alignment trend. In addition to the three characteristic diffraction peaks corresponding to stainless steel, the XRD pattern of MnO2/NiCo2O4/316L also forms the diffraction peak corresponding to NiCo2O4, and the characteristic peak of MnO2(220) crystal plane appears to shift to a low angle. The polarization curve test shows that MnO2/NiCo2O4 nanomaterials have excellent hydrogen evolution performance, and with the increase of overpotential, the current density also increases significantly, with a faster hydrogen evolution reaction speed, indicating that the hydrogen evolution performance is improved by synergistic effect between NiCo2O4 and MnO2.
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Received: 19 August 2018
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2019, Vol. 29 
