Heteroatom-induced domain electrostatic potential difference in ZnIn₂S₄nanosheets for efficient charge separation and boosted photocatalytic overall water splitting

Abstract

Al-ZIS nanosheets exhibit a good photocatalytic overall water splitting performance. Al doping induce domain electrostatic potential difference to accelerate the separation efficiency of photogenerated charge carriers.

Latest Progress on Photocatalytic H2 Production by Water Splitting and H2 Production Coupled with Selective Oxidation of Organics over ZnIn2S4-Based Photocatalysts

“…As we know, elemental doping can enhance the activity of the photocatalyst via adjusting the electron structure and alleviating the photocorrosion of sulfide . Through a solvothermal reaction under magnetic stirring, Sun et al prepared ultrathin Al-doped ZnIn 2 S 4 (Al-ZIS) nanosheets. Al-doping induced the charge redistribution in a single atomic layer of the ZnIn 2 S 4 nanosheet, leading to an increased electron density around the S sites and an enriched positive charge on the Zn and Al sites, respectively, which strengthened the adsorption of H + and H 2 O on the Al-ZIS nanosheets.…”

“…Since the first report of HER over ZnIn 2 S 4 spheres, ZnIn 2 S 4 photocatalyst has attracted increasing attention due to the following advantages: (1) a stronger visible light absorption than wide band gap semiconductors such as metal oxides TiO 2 , perovskite SrTiO 3 , and KTaO 3 ; (2) better photochemical stability than metal sulfide CdS; (3) a more negative conduction potential than oxy-nitride TaON, which facilitates the H 2 evolution reaction; and (4) as compared to the synthesis of g-C 3 N 4 by thermal polymerization of precursors such as urea or melamine at a temperature above 500 °C, ZnIn 2 S 4 is usually synthesized via a conventional hydrothermal or solvothermal reaction below 200 °C. Moreover, its energy band structure is suitable for overall water splitting . However, it faces some general shortcomings, such as fast charge carrier recombination and slow surface reaction kinetics, which limit its performance.…”

ZnIn2S4 with oxygen atom doping and surface sulfur vacancies for overall water splitting under visible light irradiation

“…2,[13][14][15] Among them, ZnIn 2 S 4 has attracted much attention because of its simple preparation method and environmentally friendliness. [16][17][18] Limited by its rapid carrier recombination and severe photocorrosion, the water splitting efficiency of ZnIn 2 S 4 is low. A number of strategies have been explored to improve its efficiency, including doping, 19 heterojunction construction, 18 and morphology regulation.…”

Atomic cation-vacancy engineering of two-dimensional nanosheets for energy-related applications

“…10 However, the reported performance of these pristine 2D nanosheets is still insufficient for their practical applications. Many strategies have been explored to improve the properties of 2D nanosheets in energy storage and conversion systems, including artificial heterostructures/superlattices, [11][12][13] surface and interface engineering, [14][15][16][17] size/composition tuning, 18 phase engineering, 19 heteroatom doping/substitution, [20][21][22][23] and vacancy engineering. [24][25][26][27][28] Among these strategies, vacancy engineering of 2D nanosheets is one of the most straightforward and effective approaches to achieve high performance.…”