High Performance Pseudocapacitor Electrode Materials Based on CoCl2 Doped Graphene Quantum Dots

被引:4
作者
Kumar, Akshay [1 ]
Sharma, Raj Kishore [1 ]
Singh, Gurmeet [1 ]
Umapathy, Siva [2 ]
Kharangarh, Poonam Rani [1 ]
机构
[1] Univ Delhi, Dept Chem, Delhi 110007, India
[2] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560077, Karnataka, India
关键词
DOUBLE-LAYER CAPACITORS; ELECTROCHEMICAL CAPACITORS; MICRO-SUPERCAPACITORS; ENERGY-STORAGE; OXIDE; CARBON; NANOCOMPOSITE; NANOSHEETS; NANOTUBES; EVOLUTION;
D O I
10.1680/jemmr.16.00151
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This work reports, for the first time, an effective synthesis of CoCl2 doped graphene quantum dots (COCl2-GQDs). Excellent results were obtained by using CoCl2 powder and graphene oxide (GO) as source materials in a facile hydrothermal process. The prepared materials were characterized by using high resolution Transmission Electron Microscopy (HRTEM), Raman Spectroscopy, U-V Visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Powder X-Ray Diffraction (PXRD) and Photoluminescence (PL). HRTEM images suggest that the majority of the CoCl2-GQDs are in the narrow range of 2.5-7 nm in diameter, much smaller than that of GQDs which are approximately 15 nm. By using different excitation energy in PL, the appearance of peak introduces additional energy level between pi and pi*, reinforcing the COCl2 doping process. We observed that CoCl2 electrodes can exhibit a reversible redox reaction of Co2+ <-> Co4+ on the electrode and show specific pseudocapacitance of similar to 300F/g. The new charge storage mechanism by using CoCl2 electrodes are easily scalable and highly economical for future pseudocapacitors which can be extended for a large variety of commercial inorganic salt electrodes.
引用
收藏
页码:227 / 233
页数:27
相关论文
共 42 条
  • [1] Bagri A, 2010, NAT CHEM, V2, P581, DOI [10.1038/NCHEM.686, 10.1038/nchem.686]
  • [2] Preparation of the novel nanocomposite Co(OH)2/ultra-stable Y zeolite and its application as a supercapacitor with high energy density
    Cao, L
    Xu, F
    Liang, YY
    Li, HL
    [J]. ADVANCED MATERIALS, 2004, 16 (20) : 1853 - +
  • [3] The Origin of Improved Electrical Double-Layer Capacitance by Inclusion of Topological Defects and Dopants in Graphene for Supercapacitors
    Chen, Jiafeng
    Han, Yulei
    Kong, Xianghua
    Deng, Xinzhou
    Park, Hyo Ju
    Guo, Yali
    Jin, Song
    Qi, Zhikai
    Lee, Zonghoon
    Qiao, Zhenhua
    Ruoff, Rodney S.
    Ji, Hengxing
    [J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2016, 55 (44) : 13822 - 13827
  • [4] CoCl2 Designed as Excellent Pseudocapacitor Electrode Materials
    Chen, Kunfeng
    Yang, Yangyang
    Li, Keyan
    Ma, Zengsheng
    Zhou, Yichun
    Xue, Dongfeng
    [J]. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 2014, 2 (03): : 440 - 444
  • [5] Water-soluble inorganic salts with ultrahigh specific capacitance: crystallization transformation investigation of CuCl2 electrodes
    Chen, Kunfeng
    Song, Shuyan
    Li, Keyan
    Xue, Dongfeng
    [J]. CRYSTENGCOMM, 2013, 15 (47): : 10367 - 10373
  • [6] Graphene/porous cobalt nanocomposite and its noticeable electrochemical hydrogen storage ability at room temperature
    Chen, Yujin
    Wang, Qingshan
    Zhu, Chunling
    Gao, Peng
    Ouyang, Qiuyun
    Wang, Tieshi
    Ma, Yang
    Sun, Chunwen
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 2012, 22 (13) : 5924 - 5927
  • [7] Template-assisted synthesis of CoP nanotubes to efficiently catalyze hydrogen-evolving reaction
    Du, Hongfang
    Liu, Qian
    Cheng, Ningyan
    Asiri, Abdullah M.
    Sun, Xuping
    Li, Chang Ming
    [J]. JOURNAL OF MATERIALS CHEMISTRY A, 2014, 2 (36) : 14812 - 14816
  • [8] Graphene nanosheets as electrode material for electric double-layer capacitors
    Du, Xian
    Guo, Peng
    Song, Huaihe
    Chen, Xiaohong
    [J]. ELECTROCHIMICA ACTA, 2010, 55 (16) : 4812 - 4819
  • [9] Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors
    El-Kady, Maher F.
    Strong, Veronica
    Dubin, Sergey
    Kaner, Richard B.
    [J]. SCIENCE, 2012, 335 (6074) : 1326 - 1330
  • [10] A Three-Dimensional Carbon Nanotube/Graphene Sandwich and Its Application as Electrode in Supercapacitors
    Fan, Zhuangjun
    Yan, Jun
    Zhi, Linjie
    Zhang, Qiang
    Wei, Tong
    Feng, Jing
    Zhang, Milin
    Qian, Weizhong
    Wei, Fei
    [J]. ADVANCED MATERIALS, 2010, 22 (33) : 3723 - +