Trends in activity for the oxygen evolution reaction on transition metal (M = Fe, Co, Ni) phosphide pre-catalysts

Chemical Science
Junyuan XuLifeng Liu

Abstract

Transition metal phosphides (TMPs) have recently emerged as a new class of pre-catalysts that can efficiently catalyze the oxygen evolution reaction (OER). However, how the OER activity of TMPs varies with the catalyst composition has not been systematically explored. Here, we report the alkaline OER electrolysis of a series of nanoparticulate phosphides containing different equimolar metal (M = Fe, Co, Ni) components. Notable trends in OER activity are observed, following the order of FeP < NiP < CoP < FeNiP < FeCoP < CoNiP < FeCoNiP, which indicate that the introduction of a secondary metal(s) to a mono-metallic TMP substantially boosts the OER performance. We ascribe the promotional effect to the enhanced oxidizing power of bi- and tri-metallic TMPs that can facilitate the formation of MOH and chemical adsorption of OH- groups, which are the rate-limiting steps for these catalysts according to our Tafel analysis. Remarkably, the tri-metallic FeCoNiP pre-catalyst exhibits exceptionally high apparent and intrinsic OER activities, requiring only 200 mV to deliver 10 mA cm-2 and showing a high turnover frequency (TOF) of ≥0.94 s-1 at the overpotential of 350 mV.

References

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Citations

Nov 12, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Sangeetha KumaravelSubrata Kundu
Nov 9, 2019·Chemistry : a European Journal·Xiaomin MaBin Zhang
Mar 18, 2020·Chemical Communications : Chem Comm·Jian LiuLijun Pan
Jun 27, 2020·Advanced Materials·Song Lin ZhangXiong Wen David Lou
Dec 5, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Yujie LiuXin Zhang
Apr 19, 2019·Chemical Science·Dallas K MannMichael Shatruk
Jan 27, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Utpal KayalAsim Bhaumik
Aug 14, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·V S SumiS M A Shibli
Mar 2, 2021·Inorganic Chemistry·Selvasundarasekar Sam SankarSubrata Kundu
Jul 25, 2021·Journal of Colloid and Interface Science·Maryam ShamloofardMohammad K Amini
May 31, 2019·Journal of the American Chemical Society·Abdelilah El ArrassiKristina Tschulik

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Methods Mentioned

BETA
transmission electron microscopy
X-ray
electron diffraction
scanning

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