Journal ArticleDOI
Zinc vacancy-promoted photocatalytic activity and photostability of ZnS for efficient visible-light-driven hydrogen evolution
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TLDR
In this article, zinc vacancy defects are successfully introduced into zinc sulfide (ZnS) via adding sodium sulfide as sulfur source during the hydrothermal reaction, and the defective ZnS with different amount of zinc vacancies were employed as catalysts for the examination of vacancy-dependent catalytic activity toward photocatalytic hydrogen evolution under visible light irradiation.Abstract:
Zinc sulfide is a superior photocatalyst for H 2 evolution, whereas the wide bandgap restricts its performance to only UV region. In this work, zinc vacancy (V Zn ) defects are successfully introduced into ZnS via adding sodium sulfide as sulfur source during the hydrothermal reaction. The defective ZnS with different amount of zinc vacancies were employed as catalysts for the examination of vacancy-dependent catalytic activity toward photocatalytic hydrogen evolution under visible light irradiation. Fluorescence emission spectra and XPS results confirm that existence of abundant zinc vacancies on ZnS. These zinc vacancies exhibit remarkable effects on modifying the electronic structure of ZnS as shown in UV–visible absorption spectra and Mott–Schottky plots. Zinc vacancies can raise valence band (VB) position that weaken the oxidative capacity of the holes to protect Zn-deficient ZnS from photocorrsion. And electrochemical and photo-electrochemical experiments also demonstrate that the charge separation and the electrons transfer are more efficient with the introduction of the Zn vacancies in ZnS. The zinc-deficient ZnS-2.5 with optimum amount of Zn vacancies shows superior photocatalytic activity for H 2 evolution that reaches 337.71 ± 3.72 μmol h −1 g −1 under visible-light irradiation and also exhibits a much higher photostability. The intrinsic modify by self-defects might be a potential strategy for design novel photocatalysts with photocorrosion stability and visible-light activity in photocatalysis proton reduction.read more
Citations
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Journal ArticleDOI
Recent advances in metal sulfides: from controlled fabrication to electrocatalytic, photocatalytic and photoelectrochemical water splitting and beyond
Sundaram Chandrasekaran,Lei Yao,Libo Deng,Christopher R. Bowen,Yan Zhang,Sanming Chen,Zhiqun Lin,Feng Peng,Peixin Zhang +8 more
TL;DR: A variety of strategies such as structural tuning, composition control, doping, hybrid structures, heterostructures, defect control, temperature effects and porosity effects on metal sulfide nanocrystals are discussed and how they are exploited to enhance performance and develop future energy materials.
Journal ArticleDOI
Zn-vacancy mediated electron-hole separation in ZnS/g-C3N4 heterojunction for efficient visible-light photocatalytic hydrogen production
TL;DR: Zhang et al. as discussed by the authors reported a ZnS/g-C3N4 heterostructure with abundant zinc vacancy defects on the surface of Zns to emphasis the synergistic promotion on charge separation.
Journal ArticleDOI
C-, N-Vacancy defect engineered polymeric carbon nitride towards photocatalysis: viewpoints and challenges
Abhinandan Kumar,Pankaj Raizada,Ahmad Hosseini-Bandegharaei,Vijay Kumar Thakur,Van-Huy Nguyen,Pardeep Singh +5 more
TL;DR: In this paper, a comprehensive study on vacancy defect engineered graphite-like carbon nitride (g-C3N4; abbreviated as GCN) photocatalysts is presented.
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Critical Aspects and Recent Advances in Structural Engineering of Photocatalysts for Sunlight-Driven Photocatalytic Reduction of CO2 into Fuels
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Powerful combination of MOFs and C3N4 for enhanced photocatalytic performance
TL;DR: In this paper, pristine metal-organic frameworks (MOFs) and graphitic carbon nitride (g-C3N4) were combined to construct g-C 3N4/MOF heterojunctions with the purpose of overcoming their individual disadvantages like fast recombination of pohotogenerated electron-hole pairs.
References
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Journal ArticleDOI
Semiconductor-based Photocatalytic Hydrogen Generation
TL;DR: Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting and its Applications d0 Metal Oxide Photocatalysts 6518 4.4.1.
Journal ArticleDOI
Recent advances in transition metal phosphide nanomaterials: synthesis and applications in hydrogen evolution reaction
Yanmei Shi,Bin Zhang +1 more
TL;DR: An overview of recent development of TMP nanomaterials as catalysts for hydrogen generation with high activity and stability is presented, and specific strategies to further improve the catalytic efficiency and stability of T MPs by structural engineering are demonstrated.
Journal ArticleDOI
Earth-abundant cocatalysts for semiconductor-based photocatalytic water splitting
TL;DR: This review for the first time summarizes all the developed earth-abundant cocatalysts for photocatalytic H2- and O2-production half reactions as well as overall water splitting.
Journal ArticleDOI
Oxygen vacancy induced band-gap narrowing and enhanced visible light photocatalytic activity of ZnO.
Junpeng Wang,Zeyan Wang,Baibiao Huang,Yandong Ma,Yuanyuan Liu,Xiaoyan Qin,Xiaoyang Zhang,Ying Dai +7 more
TL;DR: The ZnO with oxygen vacancies are found to be efficient for photodecomposition of 2,4-dichlorophenol under visible light irradiation and a narrowing bandgap can be confirmed by the enhancement of the photocurrent response when theZnO was irradiated with visible light.
Journal ArticleDOI
Vacancy associates promoting solar-driven photocatalytic activity of ultrathin bismuth oxychloride nanosheets
Meili Guan,Chong Xiao,Jie Zhang,Shaojuan Fan,Ran An,Qingmei Cheng,Junfeng Xie,Min Zhou,Bangjiao Ye,Yi Xie +9 more
TL;DR: High solar photocatalytic activity in ultrathin BiOCl nanosheets with almost fully exposed active {001} facets is achieved and some new and deep-seated insights are provided into how the defects in the exposed active facets affect the solar-driven photoc atalytic property are provided.
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