Plasmonic Ag‑Decorated Few‑Layer MoS2 Nanosheets Vertically Grown on Graphene for Efficient Photoelectrochemical Water Splitting  

作　　者：Dong‑Bum Seo Tran Nam Trung Dong‑Ok Kim Duong Viet Duc Sungmin Hong Youngku Sohn Jong‑Ryul Jeong Eui‑Tae Kim 

机构地区：[1]Department of Materials Science and Engineering,Chungnam National University,Daejeon 34134,Republic of Korea [2]Department of Chemistry,Chungnam National University,Daejeon 34134,Republic of Korea

出　　处：《Nano-Micro Letters》2020年第12期159-172,共14页纳微快报（英文版）

基　　金：This work was supported by the National Research Foundation of Korea(NRF)grants funded by the Ministry of Education(2020R1I1A3A04037241 and 2019R1A6A3A13095792)and the Korea Government(MSIT)(2020R1A4A4079397).

摘　　要：A controllable approach that combines surface plasmon resonance and twodimensional(2D)graphene/MoS2 heterojunction has not been implemented despite its potential for efficient photoelectrochemical(PEC)water splitting.In this study,plasmonic Ag-decorated 2D MoS2 nanosheets were vertically grown on graphene substrates in a practical large-scale manner through metalorganic chemical vapor deposition of MoS2 and thermal evaporation of Ag.The plasmonic Ag-decorated MoS2 nanosheets on graphene yielded up to 10 times higher photo-to-dark current ratio than MoS2 nanosheets on indium tin oxide.The significantly enhanced PEC activity could be attributed to the synergetic effects of SPR and favorable graphene/2D MoS2 heterojunction.Plasmonic Ag nanoparticles not only increased visible-light and near-infrared absorption of 2D MoS2,but also induced highly amplified local electric field intensity in 2D MoS2.In addition,the vertically aligned 2D MoS2 on graphene acted as a desirable heterostructure for efficient separation and transportation of photo-generated carriers.This study provides a promising path for exploiting the full potential of 2D MoS2 for practical large-scale and efficient PEC water-splitting applications.

关 键 词：PHOTOELECTROCATALYSIS Molybdenum disulfide GRAPHENE Surface plasmon resonance 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O643.36[理学—物理化学] TQ116.2[理学—化学]