Size effect of bifunctional gold in hierarchical titanium oxide-gold-cadmium sulfide with slow photon effect for unprecedented visible-light hydrogen production
Size effect of bifunctional gold in hierarchical titanium oxide-gold-cadmium sulfide with slow photon effect for unprecedented visible-light hydrogen production
复制标题
双功能金在分级氧化钛-金-硫化镉中的尺寸效应，具有慢光子效应，可实现前所未有的可见光制氢
DOI：
10.1016/j.jcis.2021.06.167
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发表时间：
2021
影响因子：
9.9
通讯作者：
Su Bao-Lian
中科院分区：
文献类型：
--
作者：
Zhao Heng;Li Chao-Fan;Hu Zhi-Yi;Liu Jing;Li Yu;Hu Jinguang;Van Tendeloo Gustaaf;Chen Li-Hua;Su Bao-Lian
金纳米粒子（Au NPs）具有表面等离子体共振（SPR）效应和良好的内部电子转移能力，已被广泛地与半导体材料结合用于电化学发光。然而，Au NPs在多组分光催化剂中的深度效应尚未完全了解。设计了一种基于TiO 2反蛋白石光子晶体结构的三元TiO 2-Au-CdS（TAC）光催化剂，研究了Au纳米粒子尺寸对慢光子效应下Au纳米粒子表面等离子体共振效应和内部电子转移的影响. Au NPs的表面等离子体共振效应和内部电子转移能力对光催化活性的增强具有协同效应。具有~ 10 nm Au NPs的三元TAC-10光催化剂在可见光下表现出前所未有的47.6 mmolh-1g− 1的析氢速率，与没有慢光子效应的样品相比表现出~ 48%的增强。特别地，TAC-10在450 nm单色光下实现了9.83%的表观量子产率。提出了一个模型和时域有限差分（FDTD）模拟揭示了Au纳米粒子的尺寸在三元TAC光催化剂的影响。本工作表明，合理设计的双功能Au NPs耦合慢光子效应可以大大促进可见光驱动水裂解制氢。
Gold nanoparticles (Au NPs) with surface plasmonic resonance (SPR) effect and excellent internal electron transfer ability have widely been combined with semiconductors for photocatalysis. However, the in-depth effects of Au NPs in multicomponent photocatalysts have not been completely understood. Herein, ternary titanium oxide-gold-cadmium sulfide (TiO2-Au-CdS, TAC) photocatalysts, based on hierarchical TiO2inverse opal photonic crystal structure with different Au NPs sizes have been designed to reveal the SPR effect and internal electron transfer of Au NPs in the presence of slow photon effect. It appears that the SPR effect and internal electron transfer ability of Au NPs, depending on their sizes, play a synergistic effect on the photocatalytic enhancement. The ternary TAC-10 photocatalyst with ~ 10 nm Au NPs demonstrates an unprecedented hydrogen evolution rate of 47.6 mmolh-1g−1under visible-light, demonstrating ~ 48% enhancement comparing to the sample without slow photon effect. In particular, a 9.83% apparent quantum yield under 450 nm monochromatic light is achieved for TAC-10. A model is proposed and finite-difference time-domain (FDTD) simulations reveal the size influence of Au NPs in ternary TAC photocatalysts. This work suggests that the rational design of bifunctional Au NPs coupling with slow photon effect could largely promote hydrogen production from visible-light driven water splitting.