Strontium-doped lanthanum iron nickelate oxide as highly efficient electrocatalysts for oxygen evolution reaction

Li, Mengran, Insani, Abi Rafdi, Zhuang, Linzhou, Wang, Zhanke, Rehman, Ateeq ur, Liu, Lian X. and Zhu, Zhonghua (2019) Strontium-doped lanthanum iron nickelate oxide as highly efficient electrocatalysts for oxygen evolution reaction Journal of Colloid and Interface Science, 553. pp. 813-819.

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Abstract

Pursuing efficient and low-cost catalysts for the sluggish oxygen evolution reaction (OER) is imperative for the large-scale deployment of promising electrochemical technologies such as water splitting and CO₂ electrochemical reduction. The earth-abundant perovskite catalysts based on LaNiO₃-δ show promise in OER catalysis because of their relatively low cost and their optimal electronic structure but suffer from low electrode-area normalized activity. In this work, we partially substituted La with Sr and Ni with Fe to enable a remarkably high OER activity with an ultra-low overpotential of 374 ± 3 mV vs RHE at a current density of 10 mA cm⁻² normalized by electrode geometric area. This performance even surpasses the performance of benchmark RuO2. Our results show that Sr could promote OER-active sites including Ni(III), O²⁻₂/O⁻, and optimal Ni/Fe ratios, which significantly improve the surface intrinsic activity at the perovskite surface. Therefore, this work not only developed a highly efficient earth-abundant catalyst towards OER, but also demonstrated the effective modulation of catalyst surface interactions through A-site doping for perovskite oxides for key applications such as water splitting, CO₂ electrochemical reduction and N₂ electrochemical fixations.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :	Name Email ORCID Li, Mengran Insani, Abi Rafdi Zhuang, Linzhou Wang, Zhanke Rehman, Ateeq ur Liu, Lian X. l.x.liu@surrey.ac.uk Zhu, Zhonghua
Date :	October 2019
DOI :	10.1016/j.jcis.2019.06.054
Uncontrolled Keywords :	Oxygen evolution reaction; Perovskite; Electrocatalysis; Heterogeneous catalyst
Depositing User :	Clive Harris
Date Deposited :	05 Dec 2019 11:32
Last Modified :	06 Dec 2019 08:17
URI:	http://epubs.surrey.ac.uk/id/eprint/853233

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