Abstract
Herein, we investigated the potential of downsizing Pt nanoparticles to single atom scale as a strategy to improve Pt utilization efficiency in electrocatalysts. We focused on Pt single atom catalysts anchored on high-surface area N-doped carbon[1-3], which have shown higher oxygen reduction reaction (ORR) activity than Pt nano-catalysts in fuel cell applications. However, the contribution of Pt nanoparticles in achieving these results has been questioned, and the selectivity of Pt SACs for ORR is still controversial. We prepared different types of carbon-supported Pt catalysts and used electrochemical measurements including rotating-ring disk electrode (RRDE) and hydrogen peroxide reduction reaction (HPRR) tests to elucidate the role of Pt SACs in carbon-supported Pt nano-catalysts. Additionally, we proposed a novel ORR mechanism based on in-situ X-ray absorption spectroscopy (XAS) and density functional theory (DFT) calculations.
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