Enhancing the Catalytic Kinetics and Stability of Ru Sites for Acidic Water Oxidation by Forming Brønsted Acid Sites in Tungsten Oxide Matrix
- Authors
- Wang, Xuefeng; Jang, Haeseong; Liu, Shangguo; Li, Zijian; Zhao, Xuhao; Chen, Yunfei; Kim, Min Gyu; Qin, Qing; Liu, Xien
- Issue Date
- Sep-2023
- Publisher
- John Wiley and Sons Inc
- Keywords
- acidic oxygen evolution reaction; Brønsted acid sites; durability; oxidation resistance; reaction kinetics
- Citation
- Advanced Energy Materials, v.13, no.36
- Journal Title
- Advanced Energy Materials
- Volume
- 13
- Number
- 36
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69474
- DOI
- 10.1002/aenm.202301673
- ISSN
- 1614-6832
1614-6840
- Abstract
- The oxygen evolution reaction (OER) suffers from sluggish kinetics even on the benchmark RuO2 catalyst, due to the complex four sequential proton-coupled electron transfer steps. Severe electrochemical oxidation and dissolution issues also make RuO2 fail as an alternative to highly expensive iridium-based OER catalysts applied in proton exchange membrane water electrolysis. Herein, an acid-stable W18O49-δ matrix-confined Ru solid solution oxide is developed with considerably reduced Ru loadings beyond commercial RuO2, to enhance the acidic OER kinetics and extend the long-term durability simultaneously by incorporating Brønsted acid sites. The representative Ru0.6W17.4O49-δ with 3D urchin-like morphology achieves an excellent catalytic stability with ultra-slow degradation rate and a high mass activity of 27 110 A g−1Ru @ 1.53 V versus RHE in 0.1 m HClO4 electrolyte, which is ≈10.8 times higher than that of commercial RuO2. The enhanced electron transfer from W to Ru during the OER process prevents the over-oxidation of surface Ru sites extending the long-term stability, while the incorporated Ru-Obri-W Brønsted acid sites accelerate the deprotonation step by promoting the mobility of proton from the oxo-intermediate to the neighboring Obri sites, thus boosting the acidic OER kinetics. © 2023 Wiley-VCH GmbH.
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