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Ternary Hybrids of Amorphous Nickel Hydroxide–Carbon Nanotube‐Conducting Polymer for Supercapacitors with High Energy Density, Excellent Rate Capability, and Long Cycle Life
Author(s) -
Jiang Wenchao,
Yu Dingshan,
Zhang Qiang,
Goh Kunli,
Wei Li,
Yong Yili,
Jiang Rongrong,
Wei Jun,
Chen Yuan
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201403354
Subject(s) - materials science , supercapacitor , ternary operation , amorphous solid , chemical engineering , capacitance , carbon nanotube , graphene , power density , nanotechnology , nanotube , electrode , organic chemistry , chemistry , power (physics) , physics , quantum mechanics , computer science , engineering , programming language
The utilization of Ni(OH) 2 as a pseudocapacitive material for high performance supercapacitors is hindered by its low electrical conductivity and short cycle life. A coaxial ternary hybrid material comprising of amorphous Ni(OH) 2 deposited on multiwalled carbon nanotubes wrapped with conductive polymer (poly (3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate)) is demonstrated. A thin layer of disordered amorphous Ni(OH) 2 is deposited by an effective “coordinating etching and precipitating” method, resulting in an ultrahigh specific capacitance of 3262 F g −1 at 5 mV s −1 and excellent rate capability (71.9% capacitance retention at 100 mV s −1 ). More importantly, the polymer layer prevents the degradation of the nanostructure and dissolution of Ni ion during repeated charge–discharge cycling for 30 000 cycles, a phenomenon which often plagues Ni(OH) 2 nanomaterials. Using the ternary Ni(OH) 2 hybrid and the reduced graphene oxide/carbon nanotube hybrid as the positive and negative electrodes, respectively, the assembled asymmetric supercapacitors exhibit high energy density of 58.5 W h kg −1 at the power density of 780 W kg −1 as well as long cycle life (86% capacitance retention after 30 000 cycles). The ternary hybrid architecture design for amorphous Ni(OH) 2 can be regarded as a general approach to obtain pseudocapacitive materials for supercapacitors with both high energy density, excellent rate capability, and long cycle life.