CoV-LDH and Zn_xCd_1–xS Solid-Solution Construct 0D/3D S-Scheme Heterojunction for Activated Solar Hydrogen Evolution

Abstract

The development of low-cost and high-activity catalysts is one of the most important aspects of photocatalytic water splitting. Here, three-dimensional (3D) CoV-LDH and zero-dimensional (0D) Zn x Cd1–x S solid solutions were effectively assembled to synthesize an efficient and stable S-scheme heterojunction photocatalyst. The hydrogen production of CoV-LDH/Zn x Cd1–x S under 5 W simulated sunlight reached 921.9 μmol (18.438 mmol h–1 g–1) in 5 h, which was 30.8 times and 223.5 times higher than those of pure Zn x Cd1–x S photocatalyst and pure CoV-LDH photocatalyst, respectively. This is because the introduction of CoV-LDH strengthens the absorption of light, and the 0D/3D interface contact can effectively promote the transfer of photogenerated charges between semiconductors and improve the surface shuttle performance to achieve efficient H2 production. The staggered band structure makes the electron flow between CoV-LDH and Zn x Cd1–x S follow a step scheme. The construction of the CoV-LDH/Zn x Cd1–x S S-scheme heterojunction retains a high redox potential and extends the life of the electron-generated carriers. This work may afford an approach for constructing high-efficiency S-scheme heterojunctions and modifying photocatalysts in future applications.

Novel CoV-LDH/GDY/CuI tandem double S-scheme heterojunction based on graphdiyne (g-CnH2n−2) toward photocatalytic hydrogen evolution

“…67 The lower overpotential of CVGC-25 may be due to the fast interfacial electron transfer rate of the composite catalyst formed by the heterojunction of CoV-LDH and GDY/CuI, further indicating that CVGC-25 is an excellent photocatalyst for hydrogen evolution. 68,69…”

“…67 The lower overpotential of CVGC-25 may be due to the fast interfacial electron transfer rate of the composite catalyst formed by the heterojunction of CoV-LDH and GDY/CuI, further indicating that CVGC-25 is an excellent photocatalyst for hydrogen evolution. 68,69 Fig. 8(B) shows the photocurrent response curves of CoV-LDH, GDY, GDY/CuI and CVGC photocatalysts, and the enlarged plots of CoV-LDH and GDY are shown in the inset.…”

S-Scheme Heterojunction ZnCdS Nanoparticles on Layered Ni–Co Hydroxide for Photocatalytic Hydrogen Evolution

“…All samples show typical type IV isotherms and H 3 type hysteresis loops. 10 As shown in Table 1, the specific surface area, pore volume, and pore size of the catalyst are listed in detail, and the specific surface area of the composite catalyst is significantly increased compared with the ZnCdS, which is caused by the introduction of NiCo-LDH with a larger specific surface area, which will provide more active sites for photogenerated electrons, which will cause more H + to undergo the reduction reaction. The pore sizes of ZnCdS, NiCo-LDH, and ZnCdS/NiCo-LDH are mainly concentrated in the range of 2−50 nm, and the samples are all mesoporous materials.…”

“…Numerous researchers have demonstrated in their work the benefits of using LDH as a cocatalyst to improve the activity of the primary catalyst and to improve the separation of photogenerated electrons and photogenerated holes. NiCo-LDH has the merits of environmental friendliness, low cost, and high efficiency due to the abundance of transition metal elements Ni and Co in the earth. − …”

Amorphous W‐S‐P Modified ZnxCd1−xS with Tunable Band Structure for Efficient Photocatalytic Overall Water Splitting

“…Although it is feasible to completely decompose water in thermodynamics, it is difficult to completely decompose water to produce H 2 and O 2 in kinetics due to the complex redox process. [12,13] Since Honda and Fujishima [14] first used Pt/TiO 2 electrodes to photocatalysis decompose water for hydrogen evolution in 1972, semiconductor photocatalytic technology has been proven to be an effective way to convert solar energy into chemical energy, which has attracted more and more attention from researchers. [15] Compared with traditional biological and chemical approaches, semiconductor photocatalytic hydrogen evolution technology is a low-cost, highefficiency, and environmentally friendly method.…”