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A universal synthesis strategy for P-rich noble metal diphosphide-based electrocatalysts for the hydrogen evolution reaction

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Abstract

Highly efficient, stable and cost-efficient electrocatalysts for hydrogen generation via water splitting have become in increasing demand for future energy systems. Hitherto, P-rich noble metal polyphosphides which can decrease noble metal (such as Rh, Pd, or Ir) dosage are important to probe potential high-performance HER electrocatalysts. Nevertheless, they are difficult to synthesize at ambient pressure and moderate temperatures. Herein, for the first time, we report a novel iridium diphosphide (IrP2) electrocatalyst embedded within an ultrathin nitrogen-doped carbon (NC) layer (IrP2@NC) synthesized at ambient pressure and moderate temperature (900 °C). Subsequent electrochemical tests revealed that such a P-rich IrP2@NC catalyst possesses the highest hydrogen evolution reaction (HER) activity among all the documented transition metal phosphide electrocatalysts, including the commercial Pt/C, with ultralow overpotentials of 8 and 28 mV to achieve 10 mA cm−2 in 0.5 M H2SO4 and 1.0 M KOH, respectively. Combined density functional theory (DFT) computational studies suggest that the introduction of phosphorus into iridium can weaken the H adsorption strength of IrP2, beneficial for boosting HER activity. More importantly, this synthetic strategy for P-rich IrP2@NC can also be applied to other noble metal diphosphides (RhP2@NC and Pd5P2@NC, etc.). This work presents a particularly efficient and stable P-rich transition metal polyphosphide with advanced HER performance and beyond.

Graphical abstract: A universal synthesis strategy for P-rich noble metal diphosphide-based electrocatalysts for the hydrogen evolution reaction

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Publication details

The article was received on 19 Jan 2019, accepted on 01 Feb 2019 and first published on 01 Feb 2019


Article type: Communication
DOI: 10.1039/C9EE00197B
Citation: Energy Environ. Sci., 2019, Advance Article

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    A universal synthesis strategy for P-rich noble metal diphosphide-based electrocatalysts for the hydrogen evolution reaction

    Z. Pu, J. Zhao, I. S. Amiinu, W. Li, M. Wang, D. He and S. Mu, Energy Environ. Sci., 2019, Advance Article , DOI: 10.1039/C9EE00197B

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