The oxygen evolution reaction (OER) requires a large overpotential which undermines the stability of electrocatalysts, typically IrOxor RuOx. RuOxis particularly vulnerable to high overpotential in acidic media, due to the formation of soluble species, thus making it nearly impossible to be used as a commercially viable OER electrocatalyst. Herein, we demonstrate that the charge transfer from Pt to conjoined RuO2dramatically stabilizes the RuO2phase against overoxidation, the main culprit of disintegration of RuO2. In this work, we compared the OER performance of three different types of Au@Pt@RuOxnanowires, namely, hetero-interfaced, gradient-alloy, and conformal-shell type, with varying degrees of interaction between Pt and RuO2. Among the studied samples, the hetero-interfaced type exhibited the highest OER mass activity of 1.311 A mgRu−1at 1.48
Bibliographical noteFunding Information:
This work was supported by National Research Foundation (NRF) of Korea, Grant No. NRF-2019R1A6A1A11044070, NRF-2019M3E5A1064709 and NRF-2020R1A2B5B03002475, and KBSI under R&D program (Project No. C38530) supervised by the Ministry of Science. Dr T. Kim acknowledges the NRF of Korea, Grant No. NRF-2020R1A6A3A01096557 and Korea University Grant. Experiments at PLS-II were supported by MSICT and POSTECH. The authors also thank KBSI Seoul Center and Busan Center for usage of their HRTEM and XPS instruments, respectively.
© The Royal Society of Chemistry 2021.
ASJC Scopus subject areas
- General Chemistry
- Renewable Energy, Sustainability and the Environment
- General Materials Science