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Nickel/cobalt layered double hydroxide hollow microspheres with hydrangea-like morphology for high-performance supercapacitors
被引:74
作者:

Yan Tao
论文数: 0 引用数: 0
h-index: 0
机构:
Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China

Li Ruiyi
论文数: 0 引用数: 0
h-index: 0
机构:
Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China

Yang Tingting
论文数: 0 引用数: 0
h-index: 0
机构:
Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China

Li Zaijun
论文数: 0 引用数: 0
h-index: 0
机构:
Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China
Minist Educ, Key Lab Food Colloids & Biotechnol, Wuxi 214122, Peoples R China Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China
机构:
[1] Jiangnan Univ, Sch Chem & Mat Engn, Wuxi 214122, Peoples R China
[2] Minist Educ, Key Lab Food Colloids & Biotechnol, Wuxi 214122, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Nickel/cobalt layered double hydroxides;
template synthesis;
hollow microspheres;
supercapacitors;
ELECTRODE MATERIALS;
GRAPHENE OXIDE;
COBALT;
FABRICATION;
COMPOSITE;
CARBONS;
D O I:
10.1016/j.electacta.2014.08.149
中图分类号:
O646 [电化学、电解、磁化学];
学科分类号:
081704 ;
摘要:
Electroactive materials with hollow nanostructures received great attractiveness due to large surface area, low density and superior structure permeablity. The paper reported a new template synthesis of nickel/cobalt layered double hydroxides (Ni/Co-LDH) without any adscititious alkali source, oxidant and step for removal of the template. Nickel nitrate, cobalt nitrate and SiO2 nanosphere were dispersed in an ethanol solution. Then, the mixed soution was heated at 160 degrees C for 6 h to obtain Ni/Co-LDH product. During the process, ethanol and nitrate underwent a redox reaction releasing hydroxide ions, which will react with nickel and cobalt ions to form ultrathin Ni/Co-LDH nanoflakes. Meanwhile, SiO2 template was gently dissolved by hydroxide ions. Interestingly, perfect match between generation rate of Ni/Co-LDH nanoflakes and removal rate of the template creates an elaborate three-dimensional structure with well-defined hollow interior and hydrangea-like exterior. The unique structure will greatly improve electron and mass transfer during the faradic redox reaction. The Ni/Co-LDH electrode exhibits excellent electrochemical performance for supercapacitors. Its specific capacitance is up to 2158.7 F g(-1) at the current density of 1 A g(-1) and 1965.6 F g(-1) at the current density of 5 A g(-1). The capacitance can keep at least 97.5% of initial value after 1500 cycles. The study also provides prominent approach for the fabrication of hollow nanomaterials with three-dimensional structure for supercapacitors, Li-ion batteries, catalyst and sensors. (C) 2014 Elsevier Ltd. All rights reserved.
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页码:530 / +
页数:8
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