Highly porous ruthenate pyrochlore with ultrasmall Ru nanoparticles and a P dopant for efficient oxygen evolution electrocatalysts in an alkaline medium
- Authors
- Lee, Geunhyeong; Cho, Youngsung; Jang, Eunsu; Kim, Jooheon
- Issue Date
- Aug-2023
- Publisher
- Elsevier B.V.
- Citation
- Applied Surface Science, v.627
- Journal Title
- Applied Surface Science
- Volume
- 627
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/67589
- DOI
- 10.1016/j.apsusc.2023.157301
- ISSN
- 0169-4332
1873-5584
- Abstract
- To enhance green energy technologies, such as metal–air batteries, designing a highly efficient electrocatalyst for the oxygen evolution reaction is crucial because of its sluggish kinetics. In this study, pyrochlore oxide was uniquely synthesized with ultrasmall Ru nanoparticles, a highly porous structure, and a P dopant via simple in situ exsolution, resulting in an outstanding intrinsic activity and surface area. The porous structure of pure pyrochlore was optimized by controlling the temperature of the cross-linking process. The pyrochlore cross-linked at 80 ℃ (YRO-80) had the highest Brunauer-emmett-Teller (BET) surface area (186.1 m2/g). Ultrasmall Ru nanoparticles anchored on Y2R2O7 pyrochlore with the P dopant (Ru/YRO-P) were simply synthesized using a one-step process. The high electrocatalytic performance of Ru/YRO-P was demonstrated by its low overpotential (232 mA/cm2), low Tafel slope (41 mV/dec), and high power density (179.2 mW/cm2) in Zn–air battery applications. This paper presents a rational design strategy for enhanced electrocatalysts. © 2023 Elsevier B.V.
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