Citation: LI Gong, CHEN Kunfeng, JIN Jingyi, XUE Dongfeng. La3+-doped NiCo Layered Double Hydroxide Nanosheets and Their Supercapacitive Performance[J]. Chinese Journal of Applied Chemistry, ;2017, 34(1): 71-75. doi: 10.11944/j.issn.1000-0518.2017.01.160455 shu

La3+-doped NiCo Layered Double Hydroxide Nanosheets and Their Supercapacitive Performance

  • Corresponding author: JIN Jingyi, 834361852@qq.com XUE Dongfeng, dongfeng@ciac.ac.cn
  • Received Date: 10 November 2016
    Revised Date: 14 November 2016
    Accepted Date: 17 November 2016

    Fund Project: Supported by the National Natural Science Foundation of China No. 91434118, No. 21521092Jilin Provincial Science and Technology Development Program No. 20160520002JHExternal Cooperation Program of BIC, Chinese Academy of Sciences No. 121522KYS820150009

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  • NiCo layered double hydroxides(NiCo-LDHs) are important electrode materials in batteries and supercapacitors, due to its layered structure and controllable ratio and kind of metal ions. In this paper, we studied the effect of La3+ ions on the crystal structures and electrochemical performances of NiCo-LDHs. According to ionic electronegativity, the values of La3+(1.327) and Co2+(1.377) are similar, leading to the replace of Co2+ by La3+ in La3+-doped NiCo-LDHs. La3+-doped NiCo-LDHs show high specific capacitance and rate performance, 1115 F/g at 1 A/g and 517 F/g at 30 A/g, respectively. XRD, FTIR and SEM prove that La3+ doping does not change the structures of NiCo-LDHs. However, CV and electrochemical impendence spectrum confirms that the nature of electron or ion transfer is adjusted by La3+ doping. Owing to the size effect of La3+ ions, the optimized ratio of La doping is 0.26%. La3+ ions doping in electrode materials can be a promising method to change their nature of electron or ion transfer(electron or ion conductivity).
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