Self-supporting amorphous nanoporous NiFeCoP electrocatalyst for efficient overall water splitting

doi:10.1016/j.jmst.2020.11.020

Abstract

Abstract:

The design of cost-effective and earth-abundant bifunctional electrocatalysts for highly efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is important for water splitting as an advanced renewable energy transformation system. In this work, the self-supporting amorphous NiFeCoP catalyst with nanoporous structure via a facile electrochemical dealloying method is reported. Benefiting from the bicontinuous nanostructure, disordered atomic arrangement, abundant active sites and synergic effect of various transition metals, the as-prepared nanoporous NiFeCoP (np-NiFeCoP) catalyst exhibits good electrocatalytic activity, which achieves the current densities of 10 mA cm^-2 at low overpotentials of 244 mV and 105 mV for OER and HER in 1.0 M KOH, respectively. In addition, the bifunctional electrocatalyst also shows outstanding and durable electrocatalytic activity in water splitting with a small voltage of 1.62 V to drive a current density of 10 mA cm^-2 in a two-electrode electrolyzer system. The present work would provide a feasible strategy to explore the eﬃcient and low-cost bifunctional electrocatalysts toward overall water splitting.

Key words: Dealloying, Amorphous NiFeCoP, Water splitting, Hydrogen evolution reaction, Oxygen evolution reaction

Yao Pang, Wence Xu, Shengli Zhu, Zhenduo Cui, Yanqin Liang, Zhaoyang Li, Shuilin Wu, Chuntao Chang, Shuiyuan Luo. Self-supporting amorphous nanoporous NiFeCoP electrocatalyst for efficient overall water splitting[J]. J. Mater. Sci. Technol., 2021, 82: 96-104.

Figures/Tables 7

Fig. 1. Schematic illustration of the synthetic method for nanoporous NiFeCoP catalyst.

Fig. 2. (a) SEM image, (b) TEM image, (c) HRTEM image and SAED pattern, (d) XRD pattern and (e) elemental mapping of Ni, Fe, Co and P of the np-NiFeCoP catalyst.

Fig. 3. XPS spectra of (a) Ni 2p3/2, (b) Fe 2p3/2, (c) Co 2p3/2, and (d) P 2p for the np-NiFeCoP catalyst.

Fig. 4. Electrochemical test results for OER: (a) LSV curves, (b) overpotentials at various current densities, (c) Tafel plots, (d) Nyquist plots, and (e) CA curve of the np-NiFeCoP.

Fig. 5. (a) In situ Raman spectra of the np-NiFeCoP, (b) magnification of the corresponding green wavelength region of (a) and (c) the intensity ratios (I1/I2).

Fig. 6. Electrochemical test results for HER: (a) LSV curves, (b) overpotentials at various current densities, (c) Tafel plots, (d) Nyquist plots, (e) SCN- poison test of the np-NiFeCoP catalyst, and (f) CA curve of the np-NiFeCoP catalyst.

Fig. 7. Overall water electrolysis: (a) schematic diagram, (b) LSV curves, and (c) long-term stability test under a constant voltage of 1.62 V.

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