Direct Synthesis of NiCo2O4 Nanoneedles and MoS2 Nanoflakes Grown on 316L Stainless Steel Meshes by Two Step Hydrothermal Method for HER

doi:10.11900/0412.1961.2018.00001

Acta Metall Sin

2018, Vol. 54

Issue (8): 1179-1186 DOI: 10.11900/0412.1961.2018.00001

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Direct Synthesis of NiCo₂O₄ Nanoneedles and MoS₂ Nanoflakes Grown on 316L Stainless Steel Meshes by Two Step Hydrothermal Method for HER

Dan LI^1,², Yang LI^1,², Rongsheng CHEN^1,², Hongwei NI^1,²(

)

1 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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Dan LI, Yang LI, Rongsheng CHEN, Hongwei NI. Direct Synthesis of NiCo₂O₄ Nanoneedles and MoS₂ Nanoflakes Grown on 316L Stainless Steel Meshes by Two Step Hydrothermal Method for HER. Acta Metall Sin, 2018, 54(8): 1179-1186.

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Abstract

The synthesis of nanostructures catalytic electrode for hydrogen evolution reaction (HER) plays an important role in national economy such as chlor-alkali industry, chemical power supply and fuel cell. Electro-splitting of water powered by electric energy has attracted extensive attention because this process can convert electric energy into chemical energy for easier storage and delivery. In this work, a facile and direct synthesis of NiCo₂O₄ nanoneedles and MoS₂ nanoflakes grown on 316L stainless steel meshes substrate by two step hydrothermal method was reported. Initially MoS₂ nanoflakes grown on the stainless steel (SS) meshes, and then NiCo₂O₄ nanoneedles were grown on MoS₂/SS meshes at optimum conditions using hydrothermal method. The prepared nanostructures were characterized by SEM, TEM and XRD. Then a three-electrode system was used to test the property of HER. The results show that the as-prepared electrode exhibits good catalytic behavior towards HER. The onset overpotential and Tafel slope are 65 mV and 108 mV/dec respectively. When the current density reaches 100 mA/cm², the overpotential is 219.6 mV. Furthermore, the composite structure exhibits good cycle stability in the same experimental conditions.

Key words: 316L stainless steel mesh hydrothermal molybdenum sulfide cobalt nickel oxide hydrogen evolution reaction (HER)

Received: 04 January 2018

ZTFLH:

O646.5

Fund: Supported by National Natural Science Foundation of China (Nos.51471122 and 51604202)

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	Dan LI
	Yang LI
	Rongsheng CHEN
	Hongwei NI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00001 OR https://www.ams.org.cn/EN/Y2018/V54/I8/1179

Fig.1 Low (a, c) and high (b, d) magnified SEM images of MoS₂ nanoflakes (a, b) and NiCo₂O₄ nanoneedles (c, d) fabricated on the stainless steel (SS) meshes

Fig.2 Surface SEM images of NiCo₂O₄/MoS₂ deposited on the MoS₂/SS meshes (a, b) and side views of NiCo₂O₄ nanoneedle (c, d) before (c) and after (d) deposited on the MoS₂/SS meshes

Fig.3 XRD spectra of MoS₂ nanoflakes, NiCo₂O₄ nanoneedle and NiCo₂O₄/MoS₂ on the stainless steel meshes

Fig.4 TEM images (a, c) and local magnifications (b, d) of as-prepared NiCo₂O₄/MoS₂ (Insets show the corresponding electron diffraction patterns)
(a, b) MoS₂ (c, d) NiCo₂O₄

Fig.5 LSV curves (a) and corresponding Tafel plot (b), Nyquist plots at open circuit potential (c) of three samples, and polarization curves of NiCo₂O₄/MoS₂ composite electrode on SS meshes before and after 1000 cyc voltammetry sweeps (d) (j—current density)

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