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Transition from Diffusion‐Controlled Intercalation into Extrinsically Pseudocapacitive Charge Storage of MoS 2 by Nanoscale Heterostructuring
Author(s) -
Mahmood Qasim,
Park Sul Ki,
Kwon Kideok D.,
Chang SungJin,
Hong JinYong,
Shen Guozhen,
Jung Young Mee,
Park Tae Jung,
Khang Sung Woon,
Kim Woo Sik,
Kong Jing,
Park Ho Seok
Publication year - 2016
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201501115
Subject(s) - materials science , molybdenum disulfide , graphene , raman spectroscopy , nanotechnology , intercalation (chemistry) , phase transition , phase (matter) , chemical physics , heterojunction , nanomaterials , optoelectronics , condensed matter physics , composite material , optics , inorganic chemistry , chemistry , physics , organic chemistry
2D nanomaterials have been found to show surface‐dominant phenomena and understanding this behavior is crucial for establishing a relationship between a material's structure and its properties. Here, the transition of molybdenum disulfide (MoS 2 ) from a diffusion‐controlled intercalation to an emergent surface redox capacitive behavior is demonstrated. The ultrafast pseudocapacitive behavior of MoS 2 becomes more prominent when the layered MoS 2 is downscaled into nanometric sheets and hybridized with reduced graphene oxide (RGO). This extrinsic behavior of the 2D hybrid is promoted by the fast Faradaic charge‐transfer kinetics at the interface. The heterostructure of the 2D hybrid, as observed via high‐angle annular dark field–scanning transmission electron microscopy and Raman mapping, with a 1T MoS 2 phase at the interface and a 2H phase in the bulk is associated with the synergizing capacitive performance. This 1T phase is stabilized by the interactions with the RGO. These results provide fundamental insights into the surface effects of 2D hetero‐nanosheets on emergent electrochemical properties.