Issue 45, 2020

Is nickel phosphide an efficient catalyst for the oxygen-evolution reaction at low overpotentials?

Abstract

Recently, metal phosphides have been reported as a new class of oxygen-evolving (pre)catalysts with superior electrochemical activity. Herein, the oxygen-evolution reaction in the presence of Ni2P was investigated, using scanning electron microscopy, nuclear magnetic resonance spectroscopy, transmission electron microscopy, spectroelectrochemistry, energy dispersive spectrometry, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and electrochemical methods. Under the oxygen-evolution reaction (OER), Ni2P was converted to nickel (hydr)oxide, which is an efficient catalyst for the OER only in the presence of Fe ions. The addition of Fe salt is a method proposed for detecting the conversion of Ni2P to Ni (hydr)oxide under the OER at low overpotentials. The different electrochemical methods showed that the thin and amorphous layer of Ni (hydr)oxide coupled with the high conductivity of Ni2P made core (Ni2P)–shell (Ni (hydr)oxide, 0.5–5 nm) type nanoparticles excellent substrates for adsorbing Fe ions and formed an excellent oxygen-evolving compound. The overpotential of the onset for the oxygen-evolution reaction in the presence of these nanoparticles was 217 mV in KOH (0.10 M).

Graphical abstract: Is nickel phosphide an efficient catalyst for the oxygen-evolution reaction at low overpotentials?

Supplementary files

Article information

Article type
Paper
Submitted
22 Jul 2020
Accepted
13 Oct 2020
First published
14 Oct 2020

New J. Chem., 2020,44, 19630-19641

Is nickel phosphide an efficient catalyst for the oxygen-evolution reaction at low overpotentials?

A. Valizadeh and M. M. Najafpour, New J. Chem., 2020, 44, 19630 DOI: 10.1039/D0NJ03701J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements