Co0.85Se magnetic nanoparticles supported on carbon nanotubes as catalyst for hydrogen evolution reaction

doi:10.1016/S1872-2067(20)63632-4

Abstract

Abstract:

Co_0.85Se magnetic nanoparticles supported on carbon nanotubes were prepared by a one-step hydrothermal method. The saturation magnetization and coercivity of the MWCNTs/Co_0.85Se nanocomposites increased due to a decrease in the Co_0.85Se nanoparticle size in the MWCNTs/Co_0.85Se nanocomposites and an increase in the distance between the Co_0.85Se nanoparticles, which increased the specific surface area, thereby benefiting the electrocatalytic performance of the catalyst. Moreover, the MWCNTs/Co_0.85Se nanocomposites exhibited an excellent hydrogen evolution reaction performance owing to the presence of MWCNTs, which enhanced the mass transport during the electrocatalytic reactions. Furthermore, in an acid solution, the 30 wt% MWCNTs/Co_0.85Se composite catalyst exhibited a current density of 10 mA cm^-2 at a small overpotential of 266 mV vs. RHE, a small Tafel slope of 60.5 mV dec^-1, and good stability for HER.

Key words: Co_0.85Se, Nanocomposites, Magnetic, Electrocatalysis, Hydrogen evolution reaction

Xiaohui Sun, Nuzahat Habibul, Hong Du. Co_0.85Se magnetic nanoparticles supported on carbon nanotubes as catalyst for hydrogen evolution reaction[J]. Chinese Journal of Catalysis, 2021, 42(1): 235-243.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63632-4

https://www.cjcatal.com/EN/Y2021/V42/I1/235

Figures/Tables 9

Fig. 1. Schematic illustration of the preparation of MWCNTs/Co0.85Se nanocomposite.

Fig. 2. XRD patterns (a) and Raman spectra (b) of Co0.85Se, MWCNTs and 30 wt% MWCNTs/Co0.85Se.

Fig. 3. High-resolution XPS spectra of Co 2p (a), Se 3d (b), and C 1s (c) for 30 wt% MWCNTs/Co0.85Se.

Fig. 4. SEM images of Co0.85Se (a) and 30 wt% MWCNTs/Co0.85Se (b).

Fig. 5. TEM and HRTEM images of Co0.85Se (a,b) and MWCNTs/Co0.85Se (c,d); (e) STEM and EDS mapping images of MWCNTs/Co0.85Se.

Fig. 6. Magnetic hysteresis loops of Co0.85Se (a) and MWCNTs/Co0.85Se (b) at 27 °C.

Fig. 7. Electrochemical measurements of the samples. LSV curves (a) and Tafel slopes (b) of Co0.85Se, 30 wt% MWCNTs/Co0.85Se nanocomposite, and commercial 20 wt% Pt/C catalyst.

Fig. 8. (a) Electrochemical impedance spectra of Co0.85Se and 30 wt% MWCNTs/Co0.85Se composite at -0.2 V vs. RHE; (b) CV curves of 30 wt% MWCNTs/Co0.85Se; (c) estimated double-layer capacitances (CDL) of Co0.85Se and 30 wt% MWCNTs/Co0.85Se composite.

Fig. 9. (a) Durability test of 30 wt% MWCNTs/Co0.85Se before and after 1500 cycles; (b) time dependence of current density of 30 wt% MWCNTs/Co0.85Se at a static potential of 30 mV (vs. RHE).

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