Issue 1, 2019, Issue in Progress

Solution-phase phosphorus substitution for enhanced oxygen evolution reaction in Cu2WS4

Abstract

Transition metal phosphides are among the most promising materials for achieving efficient electrocatalytic performance without the use of rare or expensive noble metals. However, previous research into phosphides for the hydrogen evolution reaction (HER) or oxygen evolution reaction (OER) has focused on high-temperature vapor-phase processes, which are not practical for large-scale applications. Here, we introduce a simple, one-step solution-phase method of phosphide synthesis by modifying Cu2WS4 using triphenylphosphine (TPP), which serves to substitute S with P and transform the normally inactive basal plane of Cu2WS4 into a defect-rich, activated basal plane. The OER activity was significantly enhanced by phosphorus substitution, with the resulting Tafel slope of the sample with ∼8 at% phosphorus reaching 194 mV dec−1, a result close to that of the best OER catalyst (RuO2, 151 mV dec−1). The sample possessed stable OER performance, showing no degradation in current density over ∼24 hours (500 cycles), proving the robust and stable nature of the phosphorus substitution. These results open the possibility for further phosphide catalyst development using this low-cost, solution-phase method.

Graphical abstract: Solution-phase phosphorus substitution for enhanced oxygen evolution reaction in Cu2WS4

Supplementary files

Article information

Article type
Paper
Submitted
09 Nov 2018
Accepted
16 Dec 2018
First published
02 Jan 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 234-239

Solution-phase phosphorus substitution for enhanced oxygen evolution reaction in Cu2WS4

T. G. Novak, O. Prakash, A. P. Tiwari and S. Jeon, RSC Adv., 2019, 9, 234 DOI: 10.1039/C8RA09261C

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