Amorphous core-shell NiMoP@CuNWs rod-like structure with hydrophilicity feature for efficient hydrogen production in neutral media

doi:10.1016/S1872-2067(24)60086-0

Abstract

Abstract:

Using interface engineering, a highly efficient catalyst with a shell@core structure was successfully synthesized by growing an amorphous material composed of Ni, Mo, and P on Cu nanowires (NiMoP@CuNWs). This catalyst only requires an overpotential of 35 mV to reach a current density of 10 mA cm^-2. The exceptional hydrogen evolution reaction (HER) activity is attributed to the unique amorphous rod-like nature of NiMoP@CuNWs, which possesses a special hydrophilic feature, enhances mass transfer, promotes effective contact between the electrode and electrolyte solution, and exposes more active sites during the catalytic process. Density functional theory revealed that the introduction of Mo weakens the binding strength of the Ni site on the catalyst surface with the H atom and promotes the desorption process of the H₂ product significantly. Owing to its facile synthesis, low cost, and high catalytic performance, this electrocatalyst is a promising option for commercial applications as a water electrolysis catalyst.

Key words: Amorphous, Three-dimensional core-shell, Electrodeposition, Neutral electrolyte, Electrocatalyst, Hydrogen evolution reaction

Jiayong Xiao, Chao Jiang, Hui Zhang, Zhuo Xing, Ming Qiu, Ying Yu. Amorphous core-shell NiMoP@CuNWs rod-like structure with hydrophilicity feature for efficient hydrogen production in neutral media[J]. Chinese Journal of Catalysis, 2024, 63: 154-163.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60086-0

https://www.cjcatal.com/EN/Y2024/V63/I8/154

Figures/Tables 5

Fig. 1. (a) Schematic of preparation process of three-dimensional core-shell structure NiMoP@CuNWs/CF, (b-d) SEM images of NiMoP@CuNWs/CF. (e-j) SEM images and SEM-EDS element mapping of NiMoP@CuNWs nanorods.

Fig. 2. TEM (a), HRTEM (b,c) images, SAED pattern (d), corresponding TEM-EDS element mappings (e-h) of NiMoP@CuNW nanorod.

Fig. 3. (a) XPS full spectra of NiMoP@CuNWs/CF and NiP@CuNWs/CF. (b) Ni 2p high-resolution XPS spectra of NiMoP@CuNWs/CF and NiP@CuNWs/CF. (c) Mo 3d high-resolution XPS spectra of NiMoP@CuNWs/CF. (d) P 2p high-resolution XPS maps of NiMoP@CuNWs/CF and NiP@CuNWs/CF.

Fig. 4. (a) HER polarization curves in 1.0 mol L?1 PBS solution. (b) Comparison of overpotential (10 mA cm-2) for NiMoP@CuNWs/CF and various non-precious metal electrocatalysts in neutral electrolyte [3,4,10,14,15,20,50-60]. (c) Tafel slopes of CuNWs/CF, Pt/C/CF, NiMoP@CuNWs/CF, NiMoP/CF and NiP@CuNWs/CF. (d) Linear fitting of the capacitive current densities vs the scan rates of NiMoP@CuNWs/CF, NiMoP/CF, NiP@CuNWs/CF and CuNWs/CF. (e) EIS Nyquist plots of NiMoP@CuNWs/CF, NiMoP/CF, NiP@CuNWs /CF, CuNWs/CF. (f) Long term durability of NiMoP@CuNWs/CF and NiMoP/CF at a current density of 10 mA cm-2.

Fig. 5. (a) Adsorption energy of H2O. (b) PDOSs of Ni-P. (c) Free energy diagram for H adsorption on surfaces of Ni-P and NiMoP. (d) PDOSs of NiMoP.

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