Photocatalytic Hydrogen Production Performance of Ag-modified S-scheme CdS/Bi2O3 Heterojunction Composites

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-08-05 DOI:10.1007/s10562-025-05132-3

Guangling Zuo, Hongyong Ye, Yiheng Fang, Jia Du, Xin Ding

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Abstract

This study successfully synthesizes an Ag-modified CdS/Bi₂O₃ (Ag-CS/BO) S-scheme heterojunction photocatalyst via a solvothermal approach coupled with a photoreduction technique. The research examines the photocatalytic hydrogen evolution performance of this Ag-modified catalyst in water splitting reactions and the underlying catalytic mechanism. The findings indicate that the S-scheme heterojunction formed by hexagonal Bi₂O₃ (BO) nanosheets and CdS (CS) nanoparticles can selectively recombine the conduction band electrons of BO with the valence band holes of CS via the effect of the interfacial internal electric field (IEF). Meanwhile, this photocatalyst retains the strongly reductive electrons (-0.53 eV vs. NHE) in the conduction band of CS and the highly oxidative holes (+ 2.76 eV vs. NHE) in the valence band of BO. The incorporation of silver nanoparticles further expands the light absorption spectrum and facilitates charge separation via the surface plasmon resonance (SPR) effect. The 3-Ag-CS/BO composite with 3 wt% silver doping demonstrates a hydrogen evolution rate of 1276.8 µmol·g^− 1·h^− 1 under simulated solar irradiation, showing a 4.4-fold increase compared to pristine BO. Additionally, this newly synthesized catalyst exhibits remarkable cycling stability. The combination of X-ray photoelectron spectrometer (XPS), Mott-Schottky measurements, and first-principles calculations all confirm the electron transfer pathway from CS to BO and reveal the unique charge separation mechanism of the S-scheme heterojunction. This study offers novel perspectives for the design of high-efficiency S-scheme heterojunction photocatalysts.

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ag修饰S-scheme CdS/Bi2O3异质结复合材料的光催化制氢性能

本研究通过溶剂热法结合光还原技术成功合成了ag修饰的CdS/Bi2O3 (Ag-CS/BO) S-scheme异质结光催化剂。研究了银改性催化剂在水裂解反应中的光催化析氢性能及其潜在的催化机理。结果表明，六方Bi2O3 （BO）纳米片与CdS （CS）纳米颗粒形成的s型异质结可以通过界面内电场（IEF）的作用，选择性地将BO的导带电子与CS的价带空穴复合。同时，该光催化剂保留了CS导带的强还原电子（-0.53 eV vs. NHE）和BO价带的高氧化空穴（+ 2.76 eV vs. NHE）。银纳米粒子的掺入进一步扩大了光吸收光谱，并通过表面等离子体共振（SPR）效应促进了电荷分离。3 wt%银掺杂的3- ag - cs /BO复合材料在模拟太阳辐照下的析氢速率为1276.8µmol·g−1·h−1，比原始BO提高了4.4倍。此外，这种新合成的催化剂具有显著的循环稳定性。结合x射线光电子能谱仪（XPS）、Mott-Schottky测量和第一性原理计算均证实了CS到BO的电子转移途径，揭示了S-scheme异质结独特的电荷分离机制。本研究为高效s型异质结光催化剂的设计提供了新的思路。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.