Abstract 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 NH3-plasma strategy. In addition to the doping of Ir, the NH3 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/cm2 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 NH3 plasma treatment.
(Effects of crystal defects, doping and substitution)
Fund: Project supported by the Priority Academic Program Development (PAPD) Program of Jiangsu Higher Education Institutions, Jiangsu Province, China and the National Natural Science Foundation of China (Grant No. 11675117).
Li-Li Deng(邓丽丽), Xiao-Ping Ma(马晓萍), Man-Ting Lu(卢曼婷), Yi He(何弈), Rong-Lei Fan(范荣磊), and Yu Xin(辛煜) Accelerated oxygen evolution kinetics on Ir-doped SrTiO3 perovskite by NH3 plasma treatment 2022 Chin. Phys. B 31 118201
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