Synergistic Effect of Bimetallic Sulfide Enhances the Performance of CdS Photocatalytic Hydrogen Evolution

Abstract

from production to applications. Energy is an indispensable resource in modern society. Photocatalytic production of hydrogen energy conforms to the international definition of modern energy, and it is a reliable and sustainable modern energy. Continued research into photocatalytic hydrogen production technologies will contribute to the achievement of sustainable goals worldwide. However, there are still many problems to realize its industrialization at present, such as insufficient light absorbing ability and too fast recombination rate of photogenerated electrons. [11,12] In order to maximize the efficient conversion of solar energy, photocatalysts first need to satisfy two conditions: a broad solar light absorption range and a high photogenerated carrier separation and transfer efficiency. It is difficult for a single semiconductor photocatalyst to meet both of these conditions, [13] so the construction of multi-component composites has attracted extensive attention. [14] Composite catalysts with band matching can generally exhibit excellent performance in photocatalysis. [15,16] Methods such as metal or nonmetal doping, [17,18] construction of heterojunctions, [19] supported cocatalyst, [20] band gap, or morphology control are usually selected to enhance the photocatalytic activity of hydrogen production in order to solve these problems. [21] In recent years, CdS has attracted research interest due to its high hydrogen production activity. [22] It has a unique energy band structure and excellent chemical stability, and has been widely studied as a potential catalyst. [23,24] However, the small specific surface area, insufficient light absorption capacity, photocorrosion, and high electron-hole recombination rate have become factors restricting its practical application. [25,26] The construction of heterojunction is an effective method to enhance photogenerated carrier transfer to expand its application in the field of photocatalysis. In addition, developing new strategies to enhance the hydrogen evolution activity can provide more possibilities for expanding its application in the field of photocatalysis. [27,28] Unlike heterojunctions that enhance photogenerated carrier transfer, the synergistic effect of metal ions provides more hydrogen evolution sites for the catalyst. According to this line of thinking, the optimization of surface active sites is carried out simultaneously with the enhancement of carrier separation, providing more possibilities for the hydrogen evolution of catalysts.The noble metal-free cobalt-based sulfides have the advantages of narrow band gaps and good chemical stability, so they High photogenerated electron-hole recombination rates and insufficient light absorption capacity are the main factors restricting the development of photocatalytic hydrogen evolution. CdS as a potential photocatalyst also faces these problems. In this work, the composite bimetallic sulfide ZnCo 2 S 4 and CdS exhibits excellent photocatalytic hydrogen evolution capability. The synergistic effect of zinc ions...

PtTe2/Sb2S3 Nanoscale Heterostructures for the Photocatalytic Direct Z-Scheme with High Solar-to-Hydrogen Efficiency: A Theoretical Investigation

“…A single semiconductor photocatalyst may struggle to meet all the necessary conditions for efficient photocatalysis. 3 Therefore, the development of multi-component nanoscale composites has become a popular approach to address this challenge. 4,5 Composite catalysts with band matching can generally exhibit excellent performance in photocatalysis.…”

“…However, the semiconductors with high η STH ′ are not easy to identify because it is simultaneously determined by the harvesting of solar energy, effective separation, fast migration of the photogenerated charge pair, and favorable overpotentials for the HER and the oxygen evolution reaction (OER). A single semiconductor photocatalyst may struggle to meet all the necessary conditions for efficient photocatalysis . Therefore, the development of multi-component nanoscale composites has become a popular approach to address this challenge. , Composite catalysts with band matching can generally exhibit excellent performance in photocatalysis .…”

A novel graphdiyne (CnH2n−2) synthesis strategy: design and application of an organic/inorganic conjugated system for photocatalytic hydrogen production

“…7f were obtained by multilevel fitting function (1), 52 and the fluorescence lifetime parameters of the photocatalysts in Table 1 were obtained by function (2). 53 The fluorescence lifetimes of pure EY were 0.31 ns, while those of GDY and g-C 3 N 4 were 0.26 ns and 0.25 ns, respectively, indicating that they are a potential photocatalyst. The fluorescence lifetime of CN-EDA-1 was significantly reduced relative to that of g-C 3 N 4 , indicating that the amino group effectively promoted carrier migration.…”

S-Scheme and Schottky Junction Synchronous Regulation Boost Hierarchical CdS@Nb2O5/Nb2CTx (MXene) Heterojunction for Photocatalytic H2 Production

“…53,54 Figure 1e shows that the Brunauer−Emmett−Teller (BET) curve of the catalyst represents a type IV adsorption isotherm, which is a property of mesoporous materials. 13 The specific surface areas (S BET ) of Nb 2 CT x and CdS are 33.2 and 34.9 m 2 / g, respectively. After the hydrothermal reaction of Nb 2 CT x , the S BET of Nb 2 O 5 /Nb 2 CT x increased to 50.3 m 2 /g.…”

“…H 2 is a renewable and sustainable energy and has rich resources, high calorific value, and pollution-free combustion. Compared with the traditional H 2 production technology, photocatalytic water cracking H 2 evolution is a green HER route. , CdS has received the most attention among different semiconductor photocatalysts as a result of its admirable light absorption performance and advantageous band structure. − Nevertheless, the practical application of pure CdS is severely restricted because of the fast photoexcited carrier recombination and poor photostability. − Therefore, plenty of scientific endeavors have been devoted to enhancing the photocatalytic activity of CdS, along with heteroatom doping, heterojunction structure, − and cocatalyst loading. , Among those, the combination of CdS with carbon-based conductive cocatalysts to create a composite system that improves the photogenerated carrier shuttle is of special interest.…”