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Issue 23, 2019
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Chestnut-like copper cobalt phosphide catalyst for all-pH hydrogen evolution reaction and alkaline water electrolysis

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Abstract

A novel type of chestnut-like copper cobalt phosphide (CuxCo1−xP) nanoarray on carbon fiber paper (CP) for the splitting of water was synthesized through a simple hydrothermal reaction followed by in situ phosphorization treatment. As a hydrogen evolution reaction (HER) catalyst, CuxCo1−xP/CP showed high HER activity at all pH values. To drive a current density of 10 mA cm−2, the optimized Cu0.075Co0.925P/CP required an overpotential of 47, 120, and 70 mV in acidic, neutral, and alkaline media, respectively. In addition, Cu0.075Co0.925P/CP exhibited excellent activity for the oxygen evolution reaction (OER) with a small overpotential of 221 mV to reach 10 mA cm−2. Furthermore, when Cu0.075Co0.925P/CP was used as both the cathode and anode for overall water splitting in 1.0 M KOH, the two-electrode electrolyzer only needed a cell voltage of 1.55 V to achieve 10 mA cm−2, which is superior to that of the noble metal-based Pt/C‖IrO2 cell and most previously reported electrocatalysts. Moreover, this electrolyzer could be powered by a single AA battery with a voltage of 1.5 V. Density functional theory (DFT) calculations further proved that the good catalytic activity of CuxCo1−xP/CP resulted from its smaller hydrogen adsorption free energy (ΔGH*) and overpotential. This work provides a promising strategy to design high-performance and low-cost electrocatalysts for overall water splitting and other energy-related applications.

Graphical abstract: Chestnut-like copper cobalt phosphide catalyst for all-pH hydrogen evolution reaction and alkaline water electrolysis

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Publication details

The article was received on 08 Apr 2019, accepted on 15 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TA03686E
J. Mater. Chem. A, 2019,7, 14271-14279

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    Chestnut-like copper cobalt phosphide catalyst for all-pH hydrogen evolution reaction and alkaline water electrolysis

    L. Yan, B. Zhang, J. Zhu, S. Zhao, Y. Li, B. Zhang, J. Jiang, X. Ji, H. Zhang and P. K. Shen, J. Mater. Chem. A, 2019, 7, 14271
    DOI: 10.1039/C9TA03686E

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