Simultaneous Manipulation of O‐Doping and Metal Vacancy in Atomically Thin Zn10In16S34 Nanosheet Arrays toward Improved Photoelectrochemical Performance

Meng, Linxing; Rao, Dewei; Tian, Wei; Cao, Fengren; Yan, Xiaohong; Li, Liang

doi:10.1002/ange.201811632

Cited by 19 publications

(6 citation statements)

References 42 publications

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“…Meng et al. synthesized both Zn and S defective Zn 10 In 16 S 34 nanosheets via the hydrothermal method and heat treatment and found the introduction of Zn, S vacancies improved the photoelectrochemical water splitting performance, which was attributed to the increased carrier separation in the bulk and transfer at the electrode/electrolyte interface . Zhu et al.…”

Section: Different Types Of Defects In Photocatalytic Materialsmentioning

confidence: 99%

Defects Engineering in Photocatalytic Water Splitting Materials

2019

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Defect engineering has been proved to be an effective approach to improve the photocatalytic performance of the photocatalysts. In this review, recent progress in the design of the defects with the classified anion vacancies, cation vacancies, and multi-vacancies on the photocatalysts to promote the photocatalytic activity is summarized. The strategies to manu-facture the defective photocatalysts and the characterization techniques to distinguish various defects are presented. The roles of defects in photocatalytic water splitting are discussed. Finally, the challenge in developing the defective photocatalysts is outlined.

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Section: Different Types Of Defects In Photocatalytic Materialsmentioning

confidence: 99%

Defects Engineering in Photocatalytic Water Splitting Materials

2019

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“…As shown in Figure c,d, the creation of Se vacancies in SnSe significantly decreased the effective mass of electrons and holes in the slab model. Under an optimal situation, a selenium-deficient sample exhibited 2- and 14-fold higher hole and electron mobility than stoichiometric SnSe . XPS depth profile analysis was conducted to investigate the defect-involved processes.…”

Section: Resultsmentioning

confidence: 99%

Self-Induced Strain in 2D Chalcogenide Nanocrystals with Enhanced Photoelectrochemical Responsivity

Cui

et al. 2020

Chem. Mater.

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Strain engineering has become an emerging strategy to tailor the performance of nanocatalysts. However, current strained catalysts overwhelmingly rely on stresses originated at catalyst–support interfaces. Self-standing strained nanostructures are extremely challenging to produce, and thus their impact on catalytic and photocatalytic activities remains largely unknown. Herein, we propose a ligand-based colloidal strategy for the one-step growth of bended metal chalcogenide nanoplates with a built-up strain. This strategy is based on the seeded growth of strained nanostructures from sacrificial seeds which provide a proper lattice mismatch. We demonstrate this strategy for the synthesis of strained orthorhombic SnSe and SnS nanoplates from rock salt SnS seeds. We probe not only the presence of atomic distortions in the periodic lattice but also its coupling with the generation of a large density of selenium vacancies. Geometrical phase analysis evidences the formation of a strain field in self-bended SnSe nanoplates, with a maximum tensile strain up to 12%. Theoretical and experimental results further reveal that the strain-related selenium vacancies strongly affect the electronic structure of SnSe and facilitate the mobility of photogenerated charge carriers, which result in a significantly improved photoelectrochemical activity. The strategy presented here opens a new avenue for precisely tuning semiconductor functionalities via strain engineering.

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“…For all calculations, the cutoff energy was 500 eV, and the convergence criteria are 10 –5 eV for energy and 10 –2 eV/Å for force. Methods for the process of OER were described in more detail in our initial work …”

Section: Experimental Methodsmentioning

confidence: 99%

Valence Engineering via Dual-Cation and Boron Doping in Pyrite Selenide for Highly Efficient Oxygen Evolution

Zuo

Rao

et al. 2019

ACS Nano

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Valence engineering has been proved an effective approach to modify the electronic property of a catalyst and boost its oxygen evolution reaction (OER) activity, while the limited number of elements restricts the structural diversity and the active sites. Also, the catalyst performance and stability are greatly limited by cationic dissolution, ripening, or crystal migration in a catalytic system. Here we employed a widely used technique to fabricate heteroepitaxial pyrite selenide through dual-cation substitution and a boron dopant to achieve better activity and stability. The overpotential of Ni-pyrite selenide catalyst is decreased from 543 mV to 279.8 mV at 10 mA cm–2 with a Tafel slope from 161 to 59.5 mV dec–1. Our theoretical calculations suggest both cation and boron doping can effectively optimize adsorption energy of OER intermediates, promote the charge transfer among the heteroatoms, and improve their OER property. This work underscores the importance of modulating surface electronic structure with the use of multiple elements and provides a general guidance on the minimization of activity loss with valence engineering.

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Simultaneous Manipulation of O‐Doping and Metal Vacancy in Atomically Thin Zn₁₀In₁₆S₃₄ Nanosheet Arrays toward Improved Photoelectrochemical Performance

Cited by 19 publications

References 42 publications

Defects Engineering in Photocatalytic Water Splitting Materials

Defects Engineering in Photocatalytic Water Splitting Materials

Self-Induced Strain in 2D Chalcogenide Nanocrystals with Enhanced Photoelectrochemical Responsivity

Valence Engineering via Dual-Cation and Boron Doping in Pyrite Selenide for Highly Efficient Oxygen Evolution

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