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Constructing a “Pizza‐Like” MoS 2 /Polypyrrole/Polyaniline Ternary Architecture with High Energy Density and Superior Cycling Stability for Supercapacitors
Author(s) -
Wang Kai,
Li Le,
Liu Ying,
Zhang Chao,
Liu Tianxi
Publication year - 2016
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201600665
Subject(s) - materials science , supercapacitor , polypyrrole , polyaniline , ternary operation , nanostructure , chemical engineering , capacitance , electrode , electrolyte , nanotechnology , polymerization , in situ polymerization , electrochemistry , composite material , polymer , chemistry , computer science , engineering , programming language
Polypyrrole (PPy) and polyaniline (PANI) are most promising candidates for high energy and power density supercapacitors. However, their relative low surface area and poor cyclic stability greatly limit their practical applications. Morphology‐ and size‐controlled micro/nanostructure formation of such materials may lead to enhanced performance. Here, the solvent‐exchange method is proposed for the preparation of high‐concentration few‐layer MoS 2 (f‐MoS 2 ) suspension in an ethanol–water mixed solvent. PPy layers with high surface coverage are formed on the resultant dispersible f‐MoS 2 by in situ polymerization of pyrrole. The MoS 2 /PPy hybrid is then used as the reactive layer for subsequent in situ growth and attachment of PANI, thus forming a “pizza‐like” MoS 2 /PPy/PANI ternary nanostructure. The rational design of such hierarchical nanostructures greatly enhances the specific capacitance up to 1273 F g −1 at 0.5 A g −1 and effectively improves the cyclic performance maintaining ≈83% after 3000 charge/discharge cycles. The excellent performances of MoS 2 /PPy/PANI hybrid are mainly attributed to robust interconnected frameworks for improved electrical conductivity and well‐defined porosities for enhanced electrolyte/electrode interaction. The superior electrochemical performance thus suggests a promising strategy for fabricating component adjustable, high energy density, and durable nanostructures as novel electrode materials for supercapacitors.