Accelerated oxygen evolution kinetics on Ir-doped SrTiO 3 perovskite by NH 3 plasma treatment
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 titana...
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Published in | Chinese physics B Vol. 31; no. 11; p. 118201 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
01.11.2022
|
Online Access | Get full text |
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Summary: | 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. |
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ISSN: | 1674-1056 |
DOI: | 10.1088/1674-1056/ac70b1 |