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Strontium-doped Lanthanum Iron Nickelate Oxide as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

Strontium-doped Lanthanum Iron Nickelate Oxide as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction

Mengran Li, Abi Rafdi Insani, Linzhou Zhuang, Zhanke Wang, Ateeq Ur Rehman, Lian X Liu, Zhonghua Zhu

J Colloid Interface Sci. 2019 Oct 1;553:813-819.

PMID: 31255943

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS72138	Lanthanum nickelate, strontium doped			Price

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