Synergistic Sr Activation and Cr Buffering Effect on RuO<sub>2</sub> Electronic Structures for Enhancing the Acidic Oxygen Evolution Reaction
The oxygen evolution reaction (OER) performance of ruthenium-based oxides strongly correlates with the electronic structures of Ru. However, the widely adopted monometal doping method unidirectionally regulates only the electronic structures, often failing to balance the activity and stability. Here, we propose an "elastic electron transfer" strategy to achieve bidirectional optimization of the electronic structures of Sr, Cr codoped RuO<sub>2</sub> catalysts for acidic OER. The introduction of electron-withdrawing Sr intrinsically activates the Ru sites by increasing the oxidation state of Ru. Simultaneously, Cr acts as an electron buffer, donating electrons to Ru in the presence of Sr in the as-prepared catalysts and absorbing excess electrons from Sr leaching during the OER. Such a bidirectional regulation feature of Cr prevents overoxidation of Ru and maintains its high oxidation state during the OER. The optimal Ru<sub>3</sub>Cr<sub>1</sub>Sr<sub>0.175</sub> catalyst exhibits a low overpotential (214 mV @ 10 mA cm<sup>-2</sup>) and excellent stability (over 300 h).
Authors
- Chunzhong Li (ORCID: https://orcid.org/0000-0001-7897-5850)
- Yongjun Shen (ORCID: https://orcid.org/0000-0002-8768-1958)
- Heng Liu (ORCID: https://orcid.org/0000-0002-7272-3908)
- Xiaozhi Su (ORCID: https://orcid.org/0000-0002-8658-4056)
- Zhenyu Wu (ORCID: https://orcid.org/0000-0001-9198-003X)
- Huihui Li (ORCID: https://orcid.org/0000-0002-1579-323X)
- Hao Li (ORCID: https://orcid.org/0000-0002-7577-1366)
- Zhongliang Liu (ORCID: https://orcid.org/0000-0002-9267-3194)
- Tianrui Xue
- Congcong Li
- Kai Zhou
Institutions
- East China University of Science and Technology (CN)
- Chinese Academy of Sciences (CN)
- Tohoku University (JP)
- Southern University of Science and Technology (CN)
- Advanced Institute of Materials Science (JP)
- Shanghai Advanced Research Institute (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-08-26
- DOI
- https://doi.org/10.1021/acs.nanolett.4c02605
- Citations
- 46
- Primary Topic
- Electrocatalysts for Energy Conversion
- Type
- article
- Field-Weighted Citation Impact
- 4.71
Funders
- National Natural Science Foundation of China
- Science and Technology Commission of Shanghai Municipality
- Iwatani Naoji Foundation
- Shanghai Rising-Star Program
- Japan Society for the Promotion of Science
- Fundamental Research Funds for the Central Universities