CoV‐LDH‐Derived CoP₂ Active Sites and Zn_xCd_1−xS Solid‐Solution Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Abstract

Establishing efficient charge‐transfer channels that provide sufficient active sites to enhance the activity of photocatalysts remains a challenging problem. In this work, n‐type CoP2 semiconductors as one of the main active components for efficient hydrogen evolution are obtained from bulk P‐CoV‐LDH. The emergence of CoP2 semiconductors not only enriches the active sites but also carries a large amount of negatively charged P, which can act as a base to seize more protons, thereby accelerating the precipitation of hydrogen. To achieve oriented control of carrier migration, the ZnxCd1−xS solid solution is effectively combined with P‐CoV‐LDH for the first time to synthesize a highly efficient and stable S‐scheme heterojunction photocatalyst. The best P‐CoV‐LDH/ZnxCd1−xS 30% composite has a hydrogen evolution rate of 1244.3 µmol without noble metal additives, which is 6.4 times more than ZnxCd1−xS. S‐scheme heterojunctions exhibit remarkable photocarrier separation efficiency and low interfacial migration resistance.

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 . 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 . The construction of nanoscale heterojunctions , and the supported cocatalysts is an usual method to make composite catalysts. , …”

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

“…The S 2p and Cd 3d spectra are shown in Figure e, f. The typical characteristic peaks at 162.0 and 160.8 eV belong to S 2p 1/2 and S 2p 3/2 , respectively, and the signals at 411.2 and 404.4 eV are assigned to Cd 3d 3/2 and Cd 3d 5/2 , respectively, which are in good agreement with S 2– and Cd 2+ in CdS. , Notably, the binding energies (BEs) of Nb 3d and O 1s in 0.5CdS@Nb 2 O 5 /Nb 2 C T x shifted by 0.4 eV toward lower BEs in comparison with those of pristine Nb 2 O 5 /Nb 2 C T x (Figure c, d), whereas the BEs of Cd 3d and S 2p in 0.5CdS@Nb 2 O 5 /Nb 2 C T x became more positive with a shift of 0.7 eV compared to pure CdS (Figure e, f). Thus, it was meant that electrons moved from CdS to Nb 2 O 5 /Nb 2 C T x across the strong interfaces, and the interfaces between CdS and Nb 2 O 5 /Nb 2 C T x constructed an internal electric field, which is favorable for charge separation and transfer. ,− …”

A critical review on layered double hydroxide (LDH)-derived functional nanomaterials as potential and sustainable photocatalysts

“…Recently, to realize the oriented control of charge pair migration, the Zn x Cd 1− x S solid solution was effectively collaborated with P–CoV-LDH to create a highly competent S-scheme-based heterojunction. In this work, 137 n-type CoP 2 obtained from the phosphidation of CoV-LDH acts as the key active species in the P–CoV-LDH/Zn x Cd 1− x S composite for effectual photocatalytic water splitting. As presented in Fig.…”