Accelerated oxygen evolution kinetics on Ir-doped SrTiO 3 perovskite by NH 3 plasma treatment

• Published in: Chinese physics B Vol. 31; no. 11; p. 118201
• Main Authors: Deng, Li-Li, Ma, Xiao-Ping, Lu, Man-Ting, He, Yi, Fan, Rong-Lei, Xin, Yu
• Format: Journal Article
• Language: English
• Published: 01.11.2022
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ac70b1

Exploring low-cost and high-performance catalysts for oxygen evolution reaction (OER) remains to be a great challenge. Iridium-based perovskite oxide has large potential in OER because of its intrinsic activity and outstanding physicochemical properties. In this study, iridium-doped strontium titanate (Ir-STO) solution is brushed on a Ti sheet by the traditional method to obtain the Ir-STO/Ti electrodes after being calcined at a high temperature. The microstructure and electrocatalysis properties of the Ir-STO are further modified by a facile and scalable NH 3 -plasma strategy. In addition to the doping of Ir, the NH 3 plasma treatment further results in N-doping into Ir-STO, which enriches active species and causes oxygen vacancies near doped sites. The resulting N, Ir-STO/Ti electrode reveals excellent acidic OER activity with the lowest overpotential of 390 mV at 10 mA/cm 2 and the smallest Tafel slope of 140 mV/dec after 10-min plasma treatment. Therefore, the great potential of activated N, Ir-STO/Ti is regarded as a catalyst for the OER, and thus making a new opportunity for developing other perovskite catalysts via NH 3 plasma treatment.