期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 50, 页码 17597-17605出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b09657
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC-SC0018029]
- NSF MRSEC program [DMR-1719875]
- Taiwan Government Scholarship
- National Science Foundation [Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM)] [DMR-1539918]
- NSF [ECCS-1542081]
- Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS) [2.5020.11]
We report the hydroxide (OHad) and oxide (O-ad) experimental electroadsorption free energies, their dependences on pH, and their correlations to the oxygen evolution reaction (OER) electrocatalysis on RuO2(110) surface. The Sabatier principle predicts that catalyst is most active when the intermediate stabilization is moderate, not too strong such that the bound intermediate disrupts the subsequent catalytic cycle, nor too weak such that the surface is ineffective. For decades, researchers have used this concept to rationalize the activity trend of many OER electrocatalysts including RuO2, which is among the state-of-the-art OER catalysts. In this article, we report an experimental assessment of the Sabatier principle by comparing the oxygen electroadsorption energy to the OER electrocatalysis for the first time on RuO2. We find that the OHad and O-ad electroadsorption energies on RuO2(110) depend on pH and obey the scaling relation. However, we did not observe a direct correlation between the OHad and O-ad electroadsorption energies and the OER activity in the comparative analysis that includes both RuO2(110) and IrO2(110). Our result raises a question of whether the Sabatier principle can describe highly active electrocatalysts, where the kinetic aspects may influence the electrocatalysis more strongly than the electroadsorption energy, which captures only the thermodynamics of the intermediates and not yet kinetics.
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