Carbon encapsulated RuO2 nano-dots anchoring on graphene as an electrode for asymmetric supercapacitors with ultralong cycle life in an ionic liquid electrolyte | |
Department | 清洁能源化学与材料实验室 |
Shen BS(申保收)1,2; Zhang X(张旭)1; Guo RS(郭瑞生)1; Lang JW(郎俊伟)1; Chen JT(陈江涛)1; Yan XB(阎兴斌)1; Yan XB(阎兴斌) | |
The second department | 固体润滑国家重点实验室 |
2016 | |
Source Publication | Journal of Materials Chemistry A |
ISSN | 2050-7488 |
Volume | 4Issue:21Pages:8180-8189 |
Abstract | Assembling asymmetric supercapacitors (SCs) combined with ionic liquid (IL) electrolytes is a very efficient strategy to enhance the energy density of SCs. However, the poor cycle stability of pseudocapacitive metal oxides in ILs seriously affects the performance of this class of asymmetric SCs. Improving the structural stability of metal oxides during the charge/discharge process is one of the greatest challenges at present. Herein, RuO2 nano-dots/reduced graphene oxide (RGO) composites are firstly prepared, and an IL-based asymmetric SC is built using the component-optimized composite (20 wt% RuO2/RGO) as the cathode and activated polyaniline-derived carbon nanorods (denoted as APDC) as the anode. It exhibits a high energy density of 108 W h kg−1, but shows poor cycling stability. In order to solve this problem, an ultrathin carbon layer originating from glucose is employed to encapsulate RuO2 nano-dots anchoring on RGO, forming a core/shell structure of RuO2@C. With the protection of the carbon shell, the as-made RuO2@C/RGO//APDC asymmetric SC exhibits superior long-term stability with 98.5% capacitance retention after 100000 cycles in the IL electrolyte, as well as a high energy density of 103 W h kg−1 with a potential window of 3.8 V. Furthermore, this protection mechanism of the carbon layer is analyzed by electrochemical quartz crystal microbalance experiments. |
Subject Area | 材料科学与物理化学 |
DOI | 10.1039/c6ta02473d |
Funding Organization | the National Nature Science Foundation of China (21573265;51501208) |
Indexed By | SCI |
If | 8.867 |
Language | 英语 |
Funding Project | 低维材料与化学储能课题组 |
compositor | 第一作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/20125 |
Collection | 清洁能源化学与材料实验室 固体润滑国家重点实验室(LSL) |
Corresponding Author | Yan XB(阎兴斌) |
Affiliation | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lab Clean Energy Chem & Mat, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China |
Recommended Citation GB/T 7714 | Shen BS,Zhang X,Guo RS,et al. Carbon encapsulated RuO2 nano-dots anchoring on graphene as an electrode for asymmetric supercapacitors with ultralong cycle life in an ionic liquid electrolyte[J]. Journal of Materials Chemistry A,2016,4(21):8180-8189. |
APA | Shen BS.,Zhang X.,Guo RS.,Lang JW.,Chen JT.,...&阎兴斌.(2016).Carbon encapsulated RuO2 nano-dots anchoring on graphene as an electrode for asymmetric supercapacitors with ultralong cycle life in an ionic liquid electrolyte.Journal of Materials Chemistry A,4(21),8180-8189. |
MLA | Shen BS,et al."Carbon encapsulated RuO2 nano-dots anchoring on graphene as an electrode for asymmetric supercapacitors with ultralong cycle life in an ionic liquid electrolyte".Journal of Materials Chemistry A 4.21(2016):8180-8189. |
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