In-situ synthesis of novel ternary CdS/PdAg/g-C3N4 hybrid photocatalyst with significantly enhanced hydrogen production activity and catalytic mechanism exploration

By Jianfeng Gao, Fudong Zhang, Huaqing Xue, Linhe Zhang, Yong Peng, Xuli Li, Yangqin Gao, Ning Li, Ge Lei. 2021

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Abstract Ternary CdS/PdAg/g-C3N4 hybrid photocatalyst was synthesized by a simple sonochemical method, and the sample exhibited excellent photocatalytic H2 evolution performance up to 3098.3 μmol g-1 h-1. This photocatalytic hydrogen production activity is 968.2 times higher than that of g-C3N4. Meanwhile, the apparent quantum yield (AQY) of the ternary hybrid photocatalyst is 9.6% at 420 nm. The extension of optical response range is verified by ultraviolet–visible diffuse reflectance spectra (DRS). Enhancement of the charge separation efficiency is examined via photoluminescence (PL), surface photovoltage (SPV) and electron spin resonance (ESR). A reasonable catalytic mechanism of the ternary hybrid photocatalyst is proposed. As an electron-bridge, PdAg bimetallic alloy NPs can assist the photoelectrons to transfer from the CB of g-C3N4 to the CB of CdS, from where the photoelectrons react with hydrogen ion to release hydrogen. This work may pave a new way on designing high efficient ternary hybrid photocatalyst.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/60ce3585a2cbdff1e93e27d8d0a965783c806b3e