Strontium-doped lanthanum iron nickelate oxide as highly efficient electrocatalysts for oxygen evolution reaction.
J Colloid Interface Sci
; 553: 813-819, 2019 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-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⯱â¯3â¯mV vs RHE at a current density of 10â¯mAâ¯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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article