Plasmonic hot electron enhanced MoS₂photocatalysis in hydrogen evolution

Abstract

With plasmonic hot electron doping, the molybdenum disulfide (MoS2) monolayer with deposited Au@Ag nanorattles effectively enhanced the hydrogen evolution reaction (HER) efficiency. The maximum photocatalysis is achieved under plasmon resonance excitation, and is actively controlled by the incident laser wavelength and power intensity. The localized phase transition of MoS2 is achieved and characterized to explicate this plasmon-enhanced hydrogen evolution. The proposed MoS2-nanoparticle composite combines surface plasmons and planar 2D materials, and pioneers a frontier field of plasmonic MoS2 photocatalysis.

Harvesting the loss: surface plasmon-based hot electron photodetection

“…For instance, hot electrons can change the doping of graphene [140] or molybdenum disulfide (MoS 2 ) [42,143], leading to structural phase transitions [42] or modulation of the absorption spectrum [143]. Hot electrons can also be used for enhancing MoS 2 photocatalysis of hydrogen evolution [144] and the photoluminescence of MoS 2 [141]. A photodetector based on hot electron injection into graphene has also been reported [139] ( Figure 5A).…”

“…The contribution of direct photoexcitation and hot carrier injection was also investigated by femtosecond pump-probe measurements [146]. In addition, MoS 2 has also been used for extracting hot electrons generated from plasmonic nanostrucutres [42,144,145]. Photodetectors working in the near-infrared regime with photoresponsivity on the level of A/W have been demonstrated ( Figure 5B) by combining photogain in bilayer MoS 2 with hot electron injection, although the large responsivity is accompanied by a relatively slow response time [145].…”

Probing the ultrafast dynamics in nanomaterial complex systems by femtosecond transient absorption spectroscopy

“…An attempt has been made to convey a consistent, physical picture of various important processes, pathways, dynamics and interactions involved in the investigated nanomaterial complex systems, most of which hold great promise in photocatalysis applications. Last but not least, this mini-review can certainly not cover all of the newly emerging aspects related to a vast number of photocatalytic nanosystems, e.g., the intriguing plasmonic photocatalysis [33,34] , in which a step forward has recently been made in our laboratory [35] that features an effective incorporation of ultrafast spectroscopy into the relevant mechanistic elucidation.…”

Plasmonics of 2D Nanomaterials: Properties and Applications

“…Some researchers deposited Ag nanorattles coated with Au on MoS 2 monolayer (shown as Figure 9 a), and they found the photocatalytic efficiency was improved by virtue of plasmonic hot electron doping 20. The core‐shell nanostructure was chosen because of its narrow absorbance linewidth.…”