Plasmonic Ag-Decorated Few-Layer MoS 2 Nanosheets Vertically Grown on Graphene for Efficient Photoelectrochemical Water
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Cite as Nano-Micro Lett. (2020) 12:172 Received: 9 June 2020 Accepted: 28 July 2020 © The Author(s) 2020
https://doi.org/10.1007/s40820-020-00512-3
Plasmonic Ag‑Decorated Few‑Layer MoS2 Nanosheets Vertically Grown on Graphene for Efficient Photoelectrochemical Water Splitting Dong‑Bum Seo1, Tran Nam Trung1, Dong‑Ok Kim1, Duong Viet Duc1, Sungmin Hong2, Youngku Sohn2, Jong‑Ryul Jeong1, Eui‑Tae Kim1 * * Eui‑Tae Kim, [email protected] 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 1
HIGHLIGHTS • Controllable and large-scale practical growth of plasmonic Ag-decorated vertically aligned 2D MoS2 nanosheets on graphene. • Realization of the synergistic effects of surface plasmon resonance and favorable graphene/MoS2 heterojunction to enhance the pho‑ toelectrochemical reactivity of 2D MoS2.
ABSTRACT A controllable
approach that combines surface plasmon resonance and twodimensional (2D) graphene/MoS2
heterojunction has not been imple‑ mented 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 prac‑ tical large-scale manner through metalorganic chemical vapor depo‑ sition of MoS2 and thermal evapo‑
ration 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 M oS2, 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. KEYWORDS Photoelectrocatalysis; Molybdenum disulfide; Graphene; Surface plasmon resonance
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1 Introduction Photoelectrochemistry (PEC) and photocatalysis of semi‑ conductors have been extensively studied as effective approaches for energy conversion, such as hydrogen gas production by water splitting, and for environmental appli‑ cations, such as air/water purification, water disinfection, and hazardous waste remediation [1–7]. Recently, twodimensional (2D) layered M oS2 has attracted considerable research attention as a promising semiconductor photocata‑ lyst because of its excellent catalytic activity, high chemical stability, eco-friendliness, and abundance in nature [2–4]. In particular, few-layer-thick MoS2 nanosheets can be central to exploiting the full potential of 2
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