Dual charge-accepting engineering modified AgIn5S8/CdS quantum dots for efficient photocatalytic hydrogen evolution overall H2S splitting

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2023-09-05 DOI:10.1016/j.apcatb.2023.122747

Anqiang Jiang , Heng Guo , Shan Yu , Fengying Zhang , Tingyu Shuai , Yubin Ke , Peng Yang , Ying Zhou

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Abstract

Low charge carrier separation and transfer efficiency continues to be the major obstacle to harvest solar energy to split hydrogen sulfide (H₂S) as hydrogen source for H₂ production with value-added utilization for waste by-products. Herein, we designed a Type-II core/shell AgIn₅S₈/CdS (AIS/CdS) quantum dots (QDs) photocatalyst capped with short-chain inorganic sulfide ion (S²⁻) ligand with dual charge-accepting engineering to promote charge carrier extraction and faster photogenerated electron transfer. Transient absorption spectroscopy analysis demonstrates that the excited electrons are fast injected into CdS shell from AIS core within 1.7 ps, instead of transferring to sub-bandgap states. Consequently, the highest photocatalytic hydrogen evolution rate of AIS/CdS QDs with S^2- ligand is 12.74 mmol g⁻¹ h⁻¹ that is more than four times of pristine AIS core. This work offers insightful guidance on the rational design of charge-accepting engineering QDs-based photocatalysts, thereby stimulating solar to hydrogen generation and resource utilization of pollutants.

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双电荷接受工程修饰的AgIn5S8/CdS量子点用于高效光催化析氢整体H2S分裂

低电荷载流子分离和转移效率仍然是收集太阳能以分离硫化氢(H2S)作为氢气源用于氢气生产并对废物副产品进行增值利用的主要障碍。本文设计了一种以短链无机硫化物离子(S2−)配体为配体的ii型核壳AgIn5S8/CdS (AIS/CdS)量子点(QDs)光催化剂，通过双电荷接受工程促进载子提取和更快的光生电子转移。瞬态吸收光谱分析表明，激发电子在1.7 ps内从AIS核心快速注入CdS壳层，而不是转移到亚带隙态。结果表明，具有S2-配体的AIS/CdS量子点的最高光催化析氢速率为12.74 mmol g−1 h−1，是原始AIS核心的4倍多。本研究对合理设计带电工程qds光催化剂，促进太阳能制氢和污染物资源化利用具有重要的指导意义。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.