Energy‐Band‐Controlling Strategy to Construct Novel Cd_xIn_1‐xS Solid Solution for Durable Visible Light Photocatalytic Hydrogen Sulfide Splitting

Abstract

Photocatalytic waste hydrogen sulfide (H2S) conversion into clean energy (H2) has an alluring prospect. Herein, a series of novel CdxIn1‐xS solid solutions are constructed by a mild hydrothermal method for visible light photocatalytic H2S splitting. The CdxIn1‐xS solid solutions with an orderly tuned visible‐light response range from 550 to 600 nm present a more positive valence band (VB) position and remarkable separation ability of charge carriers. As a result, the optimized cubic CdxIn1‐xS solid solution casts the extraordinary photocatalytic H2 evolution rate (16.35 mmol g−1 h−1) from H2S, which is 5‐ and 23‐fold higher than that over bare CdS (3.40 mmol g−1 h−1) and β‐In2S3 (0.72 mmol g−1 h−1), respectively, exceeding previous CdS‐based photocatalysts in the absence of co‐catalysts. The corresponding quantum efficiency (QE) at 420 nm is 26.7%. The combination of experiment and density functional theory (DFT) calculation confirms that the formation of CdxIn1‐xS solid solution has three functions for H2S splitting: i) improving anti‐photocorrosion properties of CdS‐based catalytsts; ii) promoting the further oxidation of sulfur (S) adsorbed on the catalyst surface; and iii) enhancing the charge‐separation efficiency. This work reports a novel CdxIn1‐xS solid solution for highly efficient photocatalytic H2 generation from H2S under visible light irradiation.

Highly dispersed PdS preferably anchored on In2S3 of MnS/In2S3 composite for effective and stable hydrogen production from H2S

“…Among various kinds of photocatalysts, metal sulfides exhibit many advantages due to their suitable band structure and strong visible-light absorption. Many research works focused on sulfides such as CdS, [21][22][23][24] ZnS, 25 CuInS2 26 have been reported; meanwhile, the development of other metal sulfides is necessary. 27 In our previous work, 28 we discovered that MnS/In2S3 composite is an effective photocatalyst for hydrogen evolution from H2S in the visible light region.…”

Defect Engineering of Photocatalysts for Solar Energy Conversion

“…Generally, solar energy conversion system always involves three different steps about charge generation, charge separation, and catalytic reactions . A substantial proportion of the efforts were conducted to exploit the promising semiconductors .…”

MoS2 and Ti3C2 Ensembles into TiO2 for Efficient Photocatalytic Hydrogen Evolution: Dual‐Bonding Interactions and Capacitive Effect Trigger the Intrinsic Activities

“…H 2 S is very harmful for the environment and human beings when the content of H 2 S is higher than the threshold limit of 10 ppm. [5] Fortunately, H 2 S is also a potential resource if both sulfur (S) and hydrogen (H 2 ) can be recovered. [5][6][7][8] Hydrogen is a necessary additive in petroleum industry for desulfurization of heavy oil.…”

“…[5] Fortunately, H 2 S is also a potential resource if both sulfur (S) and hydrogen (H 2 ) can be recovered. [5][6][7][8] Hydrogen is a necessary additive in petroleum industry for desulfurization of heavy oil. More importantly, it is a widely recognized clean energy source with high energy density.…”