Advantageous Interfacial Effects of AgPd/g‐C3N4 for Photocatalytic Hydrogen Evolution: Electronic Structure and H2O Dissociation. Issue 19 (12th March 2019)

• Record Type: Journal Article
• Authors: Zou, Weixin; Xu, Lixia; Pu, Yu; Cai, Haojie; Wei, Xiaoqian; Luo, Yidan; Li, Lulu; Gao, Bin; Wan, Haiqin; Dong, Lin
• Is Part Of: Chemistry. Volume 25:Issue 19(2019)
• Page Start: 5058
• Page End: 5064
• Publication Date: 2019-03-12
• Subjects: AgPd/g-C3N4 -- bimetallic -- interfacial electronic effect -- nanoparticles -- photocatalytic hydrogen evolution -- water splitting; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201806074
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Bimetallic AgPd nanoparticles have been synthesized before, but the interfacial electronic effects of AgPd on the photocatalytic performance have been investigated less. In this work, the results of hydrogen evolution suggest that the bimetallic AgPd/g‐C3 N4 sample has superior activity to Ag/g‐C3 N4 and Pd/g‐C3 N4 photocatalysts. The UV/Vis diffuse reflectance spectroscopy, X‐ray photoelectron spectroscopy, CO adsorption diffuse reflectance FTIR spectroscopy, and FTIR results demonstrate that in the AgPd/g‐C3 N4, the surface electronic structures of Pd and Ag are changed, which is beneficial for faster photogenerated electron transfer and greater H2 O molecule adsorption. In situ ESR spectra suggest that, under visible light irradiation, there is more H2 O dissociation to radical species on the AgPd/g‐C3 N4 photocatalyst. Furthermore, DFT calculations confirm the interfacial electronic effects of AgPd/g‐C3 N4, that is, Pd δ− ⋅⋅⋅Ag δ+, and the activation energy of H2 O molecule dissociation on AgPd/g‐C3 N4 is the lowest, which is the main contributor to the enhanced photocatalytic H2 evolution. Abstract : Bimetallic photocatalysts : Bimetallic AgPd nanoparticles are loaded on g‐C3 N4 for photocatalytic H2 evolution. The resultant AgPd/g‐C3 N4 shows superior activity to the monometallic Ag/g‐C3 N4 and Pd/g‐C3 N4 . The interfacial interaction between the metals is beneficial in accelerating photogenerated electron transfer, H2 O molecule adsorption, and H2 O dissociation, leading to enhanced photocatalytic H2 O reduction to H2 .