@article{10.11648/j.nsnm.20180401.11,
  author = {Dongxia An and Yu Zhang and Meigui Feng and Hong Zhang and Gang Ma and Cuimiao Zhang and Zhiguang Ma},
  title = {Cobalt/Nickel Double Oxides Prepared by Two Methods Exhibiting Supercapacitive Performances},
  journal = {Nanoscience and Nanometrology},
  volume = {4},
  number = {1},
  pages = {1-8},
  doi = {10.11648/j.nsnm.20180401.11},
  url = {https://doi.org/10.11648/j.nsnm.20180401.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.nsnm.20180401.11},
  abstract = {Two different three-dimensional nanostructured cobalt/nickel layered double oxides grown on Ni foam (NF) were synthesized through one-step (NF/NiCo2O4) and two-step (NF/Co3O4/NiO) solvothermal method for flexible and high performance supercapacitor applications. The as-prepared composites have been systematically characterized by powder X-ray diffraction, scanning electron microscopy, and Brunauer-Emmett-Teller analysis. The pseudocapacitive performances of composite electrode materials were investigated by the electrochemical tests. Cyclic voltammetry (CV), Galvanostatic charge–discharge (GCD) and Electrochemical impedance spectra (EIS) were performed using workstation. When the current density is 1 A/g, the capacitance of NF/Co3O4/NiO electrode material is 992 F/g; the capacitance of NF/NiCo2O4 is 239 F/g. And the retention of NF/NiCo2O4 electrode is 93.8% after 2000 cycles. From this comparison, it could see that the NF/Co3O4/NiO electrode exhibits more than four times higher specific capacitance at a current density of 1 A/g, good capacitance retention and excellent cycling stability than NF/NiC2O4 electrode. Furthermore that the specific capacitance of NF/Co3O4/NiO electrode increases after testing for 2000 cycles. And it can see the comparison between the interfacial charge transfer resistance (Rct) (occurring at the electrode/electrolyte interface and double layer capacitance caused by Faradaic reactions) and Warburg resistance (W), (corresponding to the ion diffusion in the host material diffusive resistance of the electrolyte in the electrode surface). The Nyquist plots are characteristic of being able to separate the charge transfer resistance and series resistance directly. However it is evident that the Nyquist plot of NF/Co3O4/NiO electrode is higher than that of NF/NiCo2O4 and NF/Co3O4 electrodes, demonstrating the Rct and Warburg resistance (W) of NF/Co3O4/NiO electrode is higher. The comprehensive test results show that the NF/Co3O4/NiO coreshell nanostructure arrays with remarkable electrochemical properties could be considered as potential electrode materials for next generation supercapacitors in high energy density storage systems.},
 year = {2018}
}

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TY  - JOUR
T1  - Cobalt/Nickel Double Oxides Prepared by Two Methods Exhibiting Supercapacitive Performances
AU  - Dongxia An
AU  - Yu Zhang
AU  - Meigui Feng
AU  - Hong Zhang
AU  - Gang Ma
AU  - Cuimiao Zhang
AU  - Zhiguang Ma
Y1  - 2018/08/07
PY  - 2018
N1  - https://doi.org/10.11648/j.nsnm.20180401.11
DO  - 10.11648/j.nsnm.20180401.11
T2  - Nanoscience and Nanometrology
JF  - Nanoscience and Nanometrology
JO  - Nanoscience and Nanometrology
SP  - 1
EP  - 8
PB  - Science Publishing Group
SN  - 2472-3630
UR  - https://doi.org/10.11648/j.nsnm.20180401.11
AB  - Two different three-dimensional nanostructured cobalt/nickel layered double oxides grown on Ni foam (NF) were synthesized through one-step (NF/NiCo2O4) and two-step (NF/Co3O4/NiO) solvothermal method for flexible and high performance supercapacitor applications. The as-prepared composites have been systematically characterized by powder X-ray diffraction, scanning electron microscopy, and Brunauer-Emmett-Teller analysis. The pseudocapacitive performances of composite electrode materials were investigated by the electrochemical tests. Cyclic voltammetry (CV), Galvanostatic charge–discharge (GCD) and Electrochemical impedance spectra (EIS) were performed using workstation. When the current density is 1 A/g, the capacitance of NF/Co3O4/NiO electrode material is 992 F/g; the capacitance of NF/NiCo2O4 is 239 F/g. And the retention of NF/NiCo2O4 electrode is 93.8% after 2000 cycles. From this comparison, it could see that the NF/Co3O4/NiO electrode exhibits more than four times higher specific capacitance at a current density of 1 A/g, good capacitance retention and excellent cycling stability than NF/NiC2O4 electrode. Furthermore that the specific capacitance of NF/Co3O4/NiO electrode increases after testing for 2000 cycles. And it can see the comparison between the interfacial charge transfer resistance (Rct) (occurring at the electrode/electrolyte interface and double layer capacitance caused by Faradaic reactions) and Warburg resistance (W), (corresponding to the ion diffusion in the host material diffusive resistance of the electrolyte in the electrode surface). The Nyquist plots are characteristic of being able to separate the charge transfer resistance and series resistance directly. However it is evident that the Nyquist plot of NF/Co3O4/NiO electrode is higher than that of NF/NiCo2O4 and NF/Co3O4 electrodes, demonstrating the Rct and Warburg resistance (W) of NF/Co3O4/NiO electrode is higher. The comprehensive test results show that the NF/Co3O4/NiO coreshell nanostructure arrays with remarkable electrochemical properties could be considered as potential electrode materials for next generation supercapacitors in high energy density storage systems.
VL  - 4
IS  - 1
ER  - 

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