Self-supporting hierarchically micro/nano-porous Ni3P-Co2P-based film with high hydrophilicity for efficient hydrogen production

doi:10.1016/j.jmst.2020.05.069

Abstract

Abstract:

Designing efficient and stable non-precious metal HER (hydrogen evolution reaction) electrocatalysts with high large current density adaptability is significant for industrial application of hydrogen production by water electrolysis. Herein, a facile strategy was developed to construct a multi-phase Ni₃P-Co₂P-(Ni-Co) film with self-supporting hierarchically micro/nano-porous structure by using bubble template method electrodeposition of self-supporting micro-porous NiCoP film, oxygen-free annealing for phase separation producing Ni₃P-Ni-Co₂P-Co structure, and acid etching for constructing surface nano-porous structure. The effective active sites for HER was significantly increased due to the hierarchically micro/nano-porous structure, which not only enlarged the surface roughness, but enhanced the bubble detachment by improving the hydrophilicity. Meanwhile, the HER electrolysis durability was improved benefiting from the Ni₃P-Co₂P phases with high corrosion resistance (especially in acid solution) and the self-supporting film structure without binder. Consequently, the NiCoP-OA-AE film exhibited high HER catalytic performance, which delivered a current density of 10 mA cm^-2 at a low overpotential of 42.9 and 39.7 mV in 1 M KOH and 0.5 M H₂SO₄, respectively. It also possessed high long-term electrolysis durability, and the cell voltage of water electrolysis using self-supporting porous NiCoP-OA-AE||IrO₂-Ta₂O₅ electrolyzer at 500 mA cm^-2 for 250 h in 0.5 M H₂SO₄ is only 2.9 V.

Key words: Self-supporting, Micro/nano-porous film, High hydrophilicity, Bubble detachment, High HER (hydrogen evolution reaction) catalytic performance

Xiangtao Yu, Xiangyu Ren, Yanwei Zhang, Zhangfu Yuan, Zhuyin Sui, Mingyong Wang. Self-supporting hierarchically micro/nano-porous Ni₃P-Co₂P-based film with high hydrophilicity for efficient hydrogen production[J]. J. Mater. Sci. Technol., 2021, 65: 118-125.

Figures/Tables 5

Fig. 1. Illustration of the structure evolution of self-supporting micro/nano-porous NiCoP-OA-AE films during fabrication process.

Fig. 2. (a) The XRD patterns of various NiCoP-based films. The HRTEM image (b), SEM image (c), and TEM image (d) of NiCoP-OA-AE film. The inset in (b) is the corresponding SAED pattern.

Fig. 3. (a) Survey XPS spectra of various NiCoP-based films. The corresponding high resolution XPS spectra of (b) Ni 2p, (c) Co 2p, and (d) P 2p for the NiCoP-OA-AE film. The inset table in (a) is the chemical composition of corresponding NiCoP-based films.

Fig. 4. (a) and (d) Linear sweep curves at 5 mV s-1, (b) and (e) Tafel polarization curves at 0.1 mV s-1, (c) and (f) Nyquist plots at the overpotential of 200 mV for HER on various films in different solutions: (a, b, c) in 1 M KOH and (d, e, f) in 0.5 M H2SO4. The inset in (c) is one time constant electrical equivalent circuit used to describe the EIS response of HER.

Fig. 5. (a) The cell voltage (U)?time (t) curves at 500 A cm-2 for HER on different NiCoP-based films in 0.5 M H2SO4. The contact angles (CA) and optical images showing bubbles on substrates during the HER at 500 mA cm-2 of different NiCoP-based films: (b) NiCoP-OA and (c) NiCoP-OA-AE.

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Self-supporting hierarchically micro/nano-porous Ni₃P-Co₂P-based film with high hydrophilicity for efficient hydrogen production

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