具有富電子Pt殼層的空心AgPt@Pt核殼催化劑：提升光催化 HO 生成選擇性與活性

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Abstract：Platinum （Pt） isan excellent oxygen reduction cocatalyst with great potential for the photocatalytic production HO However，its catalytic efficiency is limited by the strongadsorption O ，whichfacilitates O-O bond cleavage and reduces selectivity for the -electron oxygen reduction reaction （ORR）.Fortunately， the strength the Pt-O bond can be weakened by adjusting the structure the cocatalystto modify theelectronic structure Pt.In this paper，PtandAg cocatalysts aresuccessively modified on the （O10）facet BiVO4 through a two-step photodeposition method. Due tothe occurrence a displacement reaction during the process， a synergistic catalyst with a hollow AgPt alloy core and an electron-rich shell （AgPt@Pt） structure is ultimately synthesized.Photocatalytic experiments demonstrated that the HO production from BiVO4 modified with hollow AgPt@Pt （0 reached an impressive 101.5μmol?L-1 .This corresponds to an AQE 5.1% ，which is 8.6 times higher than that the Pt/BiVO4 photocatalyst with only 35.7μmol?L-1 . Furthermore， research results show that AgPt can transfer electrons to the Pt shell to generate electron-rich Ptδ- active sites， thus increasing the antibonding orbital occupancy Pt-Oads in AgPt@Pt catalysts. This electron redistribution weakens the adsorption strength O on Pt， promoting the -electron ORR and facilitating the efficient generation HO .This synthesis strategy fers a versatile approach for preparing other Pt-based nano-alloy cocatalysts with improved activity for the selective reduction O to HO

Key Words： Photocatalysis； Electron-rich Ptδ- ； O -adsorption; HO ；BiVO4

摘要：鉑（Pt）作為優(yōu)異的氧還原助催化劑，在光催化產(chǎn) HO 方面具有巨大潛力。（剩余16939字）