3D hierarchical NiS2/MoS2 nanostructures on CFP with enhanced electrocatalytic activity for hydrogen evolution reaction

doi:10.1016/j.jmst.2019.05.037

Abstract

Abstract:

The electrocatalytic activity for hydrogen evolution reaction (HER) is strongly correlated with active edge sites and resulting efficient charge transport capability. Here, we presented a facile two-step method to synthesize 3D hierarchical NiS₂/MoS₂ composite nanostructures on a carbon fiber paper (CFP) skeleton. The nanostructures distributed on CFP uniformly and composed of 2D nanosheets, which would provide plenty of active edge sites and increase the HER activity. Electrochemical measurement suggests that the prepared NiS₂/MoS₂ exhibit great HER activity including a low overpotential of 102 mV, a small Tafel slope of 67 mV/dec, and a high double-layer capacity of 53.7 mF/cm² in 1 M KOH aqueous solution. In addition, the HER activity is almost unchanged after galvanostatic technique with applied current densities of 10 mA/cm² for 20 h.

Key words: 3D hierarchical nanostructure, Bimetal sulfide, Hydrogen evolution reaction

Jieqiong Wang, Zheng Liu, Changhong Zhan, Kexi Zhang, Xiaoyong Lai, Jinchun Tu, Yang Cao. 3D hierarchical NiS₂/MoS₂ nanostructures on CFP with enhanced electrocatalytic activity for hydrogen evolution reaction[J]. J. Mater. Sci. Technol., 2020, 39: 155-160.

Figures/Tables 6

Fig. 1. Schematic illustration for the preparation of 3D hierarchical NiS2/MoS2 on CFP.

Fig. 2. (a) XRD patterns, (b) Raman spectrum, of the prepared NiS2/MoS2 nanostructures.

Fig. 3. High-resolution XPS profiles of (a) Mo 3d, (b) Ni 2p, and (c) S 2p.

Fig. 4. (a), (b) SEM image, (c) TEM image of NiMoO4 on CFP, (d), (e) SEM image, (f), (g) TEM image of NiS2/MoS2, (h) HRTEM image of NiS2/MoS2; beside (h) is the enlarge site showing the interplanar spacing of NiS2 and the interface of NiS2 and MoS2.

Fig. 5. HER electrocatalytic performances of NiS2/MoS2 hierarchical structures (a) Linear sweeping voltammetry, (b) Tafel plots, (c) Typical cyclic voltammogram curves, (d) Differences in current density (ΔJ=Ja-Jc).

Fig. 6. (a) Nyquist plots with an overpotential of 200 mV in 1.0 M KOH; (b) Time-dependent overpotential of all electrodes with a constant current density of 10 mA/cm2 in 1.0 M KOH.

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3D hierarchical NiS₂/MoS₂ nanostructures on CFP with enhanced electrocatalytic activity for hydrogen evolution reaction

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