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Issue 8, 2015
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Ni2P as a Janus catalyst for water splitting: the oxygen evolution activity of Ni2P nanoparticles

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Abstract

Electrochemical water splitting into hydrogen and oxygen is a promising method for solar energy storage. The development of efficient electrocatalysts for water splitting has drawn much attention. However, catalysts that are active for both the hydrogen evolution and oxygen evolution reactions are rare. Herein, we show for the first time that nickel phosphide (Ni2P), an excellent hydrogen evolving catalyst, is also highly active for oxygen evolution. A current density of 10 mA cm−2 is generated at an overpotential of only 290 mV in 1 M KOH. The high activity is attributed to the core–shell (Ni2P/NiOx) structure that the material adopts under catalytic conditions. The Ni2P nanoparticles can serve as both cathode and anode catalysts for an alkaline electrolyzer, which generates 10 mA cm−2 at 1.63 V.

Graphical abstract: Ni2P as a Janus catalyst for water splitting: the oxygen evolution activity of Ni2P nanoparticles

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The article was received on 13 Apr 2015, accepted on 09 Jun 2015 and first published on 09 Jun 2015


Article type: Communication
DOI: 10.1039/C5EE01155H
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Energy Environ. Sci., 2015,8, 2347-2351

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    Ni2P as a Janus catalyst for water splitting: the oxygen evolution activity of Ni2P nanoparticles

    L. Stern, L. Feng, F. Song and X. Hu, Energy Environ. Sci., 2015, 8, 2347
    DOI: 10.1039/C5EE01155H

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