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• W4382502171 abstract "Solar water oxidation is a critical step in artificial photosynthesis. Successful completion of the process requires four holes and releases four protons. It depends on the consecutive accumulation of charges at the active site. While recent research has shown an obvious dependence of the reaction kinetics on the hole concentrations on the surface of heterogeneous (photo)electrodes, little is known about how the catalyst density impacts the reaction rate. Using atomically dispersed Ir catalysts on hematite, we report a study on how the interplay between the catalyst density and the surface hole concentration influences the reaction kinetics. At low photon flux, where surface hole concentrations are low, faster charge transfer was observed on photoelectrodes with low catalyst density compared to high catalyst density; at high photon flux and high applied potentials, where surface hole concentrations are moderate or high, slower surface charge recombination was afforded by low-density catalysts. The results support that charge transfer between the light absorber and the catalyst is reversible; they reveal the unexpected benefits of low-density catalyst loading in facilitating forward charge transfer for desired chemical reactions. It is implied that for practical solar water splitting devices, a suitable catalyst loading is important for maximized performance." @default.
• W4382502171 created "2023-06-30" @default.
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• W4382502171 date "2023-07-12" @default.
• W4382502171 modified "2023-10-05" @default.
• W4382502171 title "Low Catalyst Loading Enhances Charge Accumulation for Photoelectrochemical Water Splitting" @default.
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• W4382502171 doi "https://doi.org/10.1002/anie.202307909" @default.
• W4382502171 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37382150" @default.
• W4382502171 hasPublicationYear "2023" @default.
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