MoS₂/WS₂ Heterojunction for Photoelectrochemical Water Oxidation

Abstract

The solar-assisted oxidation of water is an essential half reaction for achieving a complete cycle of water splitting. nanosheets results in a 10-fold increase in incident-photon-to-current-efficiency compared to the individual constituents. This proves that charge carrier lifetime is tailorable in atomically thin crystals by creating heterojunctions of different compositions and architectures. Our results suggest that the MoS 2 and WS 2 nanosheets and their bulk heterojunction blend are interesting photocatalytic systems for water oxidation, which can be coupled with different reduction processes for solar-fuel production.

Engineered 2D Transition Metal Dichalcogenides—A Vision of Viable Hydrogen Evolution Reaction Catalysis

“…While TMD heterostructures for electrocatalysis are only few and far between, [ 149,150 ] recent reports on improved synthesis techniques for photocatalysis show the promise and power of this approach. [ 197–200 ] On the catalytic activity scale, the emerging twistronics may be introduced to precisely control the electronic structure of TMD bilayer heterostructures, where just by changing the angle of stacking significantly changes in band‐structure emerge. [ 201,202 ] As studied between a wider variety of TMDs or incorporated into machine learning theory, [ 203,204 ] it is anticipated to be another powerful tool for optimized HER catalysis.…”

Coupling Interface Constructions of MoS2/Fe5Ni4S8 Heterostructures for Efficient Electrochemical Water Splitting

“…Generally, the active sites of MoS 2 NSs also contain sulfur vacancies in the basal plane according to recent studies . Furthermore, 2D MoS 2 NSs have been synthesized by several common methods, such as physical exfoliation, chemical exfoliation, hydrothermal process, and atomic layer deposition . Chemical vapor deposition (CVD) is also recognized as an available method to gain high‐quality MoS 2 NSs which others do not possess …”

Gold Decoration and Photoresistive Response to Nitrogen Dioxide of WS2 Nanotubes

“…In turn, ultra‐small and single‐layer MoS 2 and WS 2 can photo‐oxidize water because of a larger band gap (bulk MoS 2 and WS 2 have an indirect band gap of 1.2–1.4 eV, whereas in a single‐layer state they become direct semiconductors with 1.8–2.0 eV band gap) and possible tuning of the VBM absolute position. Indeed, several photocatalysts based on single‐layer MoS 2 /WS 2 have been reported recently for oxygen evolution from the water . Nanoscale MoS 2 was also reported to catalyse photooxidation of organic chemicals under visible light via the formation of hydroxyl radicals .…”