Template-free approach to synthesize hierarchical porous nickel cobalt oxides for supercapacitors

被引:105
作者
Chang, Jie [1 ]
Sun, Jing [1 ]
Xu, Chaohe [1 ]
Xu, Huan [1 ]
Gao, Lian [1 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
基金
中国国家自然科学基金;
关键词
CAPACITIVE ENERGY-STORAGE; ELECTRODE MATERIALS; ELECTROCHEMICAL CAPACITORS; PERFORMANCE; CARBON; GRAPHENE; ARRAYS; NANOSHEETS; COMPOSITES; NANOWIRES;
D O I
10.1039/c2nr31725g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nickel cobalt oxides with various Ni/Co ratios were synthesized using a facile template-free approach for electrochemical supercapacitors. The texture and morphology of the nanocomposites were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller analysis (BET). The results show that a hierarchical porous structure assembled from nanoflakes with a thickness of similar to 10 nm was obtained, and the ratio of nickel to cobalt in the nanocomposites was very close to the precursors. Cyclic voltammetry (CV) and galvanostatic charge and discharge tests were carried out to study the electrochemical performance. Both nickel cobalt oxides (Ni-Co-O-1 with Ni : Co = 1, Ni-Co-O-2 with Ni : Co = 2) outperform pure NiO and Co3O4. The Ni-Co-O-1 and Ni-Co-O-2 possess high specific capacities of 778.2 and 867.3 F g(-1) at 1 A g(-1) and capacitance retentions of 84.1% and 92.3% at 10 A g(-1), respectively. After full activation, the Ni-Co-O-1 and Ni-Co-O-2 could achieve a maximum value of 971 and 1550 F g(-1) and remain at similar to 907 and similar to 1450 F g(-1) at 4 A g(-1), respectively. Also, the nickel cobalt oxides show high capacity retention when fast charging.
引用
收藏
页码:6786 / 6791
页数:6
相关论文
共 39 条
[1]   One dimensional MnO2/titanium nitride nanotube coaxial arrays for high performance electrochemical capacitive energy storage [J].
Dong, Shanmu ;
Chen, Xiao ;
Gu, Lin ;
Zhou, Xinhong ;
Li, Lanfeng ;
Liu, Zhihong ;
Han, Pengxian ;
Xu, Hongxia ;
Yao, Jianhua ;
Wang, Haibo ;
Zhang, Xiaoying ;
Shang, Chaoqun ;
Cui, Guanglei ;
Chen, Liquan .
ENERGY & ENVIRONMENTAL SCIENCE, 2011, 4 (09) :3502-3508
[2]   A self-assembled hierarchical nanostructure comprising carbon spheres and graphene nanosheets for enhanced supercapacitor performance [J].
Guo, Chun Xian ;
Li, Chang Ming .
ENERGY & ENVIRONMENTAL SCIENCE, 2011, 4 (11) :4504-4507
[3]   The Sol-Gel-Derived Nickel-Cobalt Oxides with High Supercapacitor Performances [J].
Hu, Guangxia ;
Tang, Chunhua ;
Li, Chunxiang ;
Li, Huimin ;
Wang, Yu ;
Gong, Hao .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2011, 158 (06) :A695-A699
[4]   Synthesis and electrochemical characterization of mesoporous CoxNi1-x layered double hydroxides as electrode materials for supercapacitors [J].
Hu, Zhong-Ai ;
Xie, Yu-Long ;
Wang, Yao-Man ;
Wu, Hong-Ying ;
Yang, Yu-Ying ;
Zhang, Zi-Yu .
ELECTROCHIMICA ACTA, 2009, 54 (10) :2737-2741
[5]   Towards the upper bound of electrochemical performance of ACNT@polyaniline arrays as supercapacitors [J].
Huang, Fan ;
Chen, De .
ENERGY & ENVIRONMENTAL SCIENCE, 2012, 5 (02) :5833-5841
[6]   Graphene-based composites [J].
Huang, Xiao ;
Qi, Xiaoying ;
Boey, Freddy ;
Zhang, Hua .
CHEMICAL SOCIETY REVIEWS, 2012, 41 (02) :666-686
[7]   Hierarchical self-assembly of ultrathin nickel hydroxide nanoflakes for high-performance supercapacitors [J].
Jiang, Hao ;
Zhao, Ting ;
Li, Chunzhong ;
Ma, Jan .
JOURNAL OF MATERIALS CHEMISTRY, 2011, 21 (11) :3818-3823
[8]   Optimisation of an asymmetric manganese oxide/activated carbon capacitor working at 2 V in aqueous medium [J].
Khomenko, V ;
Raymundo-Piñero, E ;
Béguin, F .
JOURNAL OF POWER SOURCES, 2006, 153 (01) :183-190
[9]   Facile approach to prepare loose-packed cobalt hydroxide nano-flakes materials for electrochemical capacitors [J].
Kong, Ling-Bin ;
Lang, Jun-Wei ;
Liu, Min ;
Luo, Yong-Chun ;
Kang, Long .
JOURNAL OF POWER SOURCES, 2009, 194 (02) :1194-1201
[10]   Supercapacitive Energy Storage and Electric Power Supply Using an Aza-Fused π-Conjugated Microporous Framework [J].
Kou, Yan ;
Xu, Yanhong ;
Guo, Zhaoqi ;
Jiang, Donglin .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2011, 50 (37) :8753-8757