Abstract
Exploring efficient photocatalysts to facilitate water splitting into green hydrogen (H2) energy is of great significance nowadays. In this work, we successfully synthesized CdS nanoflowers coated by zero-dimensional MMoS4 (M = Ni, Co, Cu) cocatalysts using a mild two-pot solvothermal method. Notably, 2.5%-NiMoS4/CdS catalyst exhibits optimal photocatalytic H2 evolution from benzyl alcohol aqueous solution under visible-light irradiation, and its photocatalytic H2 activity (7269.5 μmol·h−1·g−1) is 10.1 times higher than that of pure CdS (716.6 μmol·h−1·g−1). Simultaneously, benzyl alcohol can be synergistically converted into benzaldehyde after dehydrogenation. Such excellent photocatalytic performance mainly benefits from the existence of an internal electric field (IEF), which is demonstrated by experimental analysis and density functional theory calculations. And the IEF greatly accelerates the separation of electron-hole pairs during the photocatalytic H2 evolution process.
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