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Application of a clustered countercurrent-flow micro-channel reactor in the preparation of KMnF3 perovskite for asymmetric supercapacitors

机译：聚类逆流流动微沟反应器在非对称超级电容器中制备KMNF3钙钛矿

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摘要

A clustered countercurrent-flow micro-channel reactor (C-CFMCR) with adjustable magnification times was constructed for the preparation of KMnF3 perovskite fluoride by a co-precipitation process, in which the concentrations and feed rates of reactants were precisely controlled. Benefitting from the enhanced micromixing efficiency of the microreactor, the KMnF3 particles prepared in C-CFMCR were smaller and less aggregated than those produced with traditional stirred reactors (STR). The prepared KMnF3 was applied as the electrode material in supercapacitors, and the electrochemical measurements showed that the KMnF3 obtained under optimal conditions had a discharge specific capacitance of similar to 442 F g(-1) at a current density of 1 A g(-1), with a decline of similar to 5.4% after 5000 charge-discharge cycles in an aqueous electrolyte of 2 M KOH. It was also found that the morphologies and electrochemical performances of the prepared KMnF3 particles changed accordingly with the micromixing efficiencies of C-CFMCR, which can be adjusted by the reactor structure and operating conditions. An asymmetric supercapacitor assembled with the KMnF3 and activated carbon exhibited an energy density of 13.1 W h kg(-1) at a power density of 386.3 W kg(-1), with eminent capacitance retention of similar to 81.2% after 5000 cycles. In addition, only a slight amplification effect of C-CFMCR on the co-precipitation process was noticed, indicating that the C-CFMCR is a promising technology for the massive and controllable production of KMnF3 particles as well as other ultrafine particles.
机译：通过共沉淀过程制备具有可调节倍率倍率的聚类逆流流动微通道反应器（C-CFMCR），用于制备KMnF 3钙钛矿氟化物，其中精确控制反应物的浓度和进料速率。受益于微激器的增强的微混凝效率，C-CFMCR制备的KMNF 3颗粒比用传统搅拌反应器（STR）产生的聚集体较小且较少。将制备的KMNF 3用作超级电容器中的电极材料，电化学测量结果表明，在最佳条件下获得的KMNF3在电流密度为1Ag（-1）时具有类似于442 f G（-1）的放电特定电容（-1 ），在2M KOH的水电解质中，在5000充放电循环后，下降的下降率为5.4％。还发现，制备的KMNF3颗粒的形态和电化学性能相应地改变了C-CFMCR的微混合效率，其可以通过反应器结构和操作条件调节。用KMNF 3和活性炭组装的不对称超级电容器在386.3W kg（-1）的功率密度下表现出13.1Wh kg（-1）的能量密度，其具有5000次循环后的突出电容保持率为81.2％。此外，注意到C-CFMCR对共沉淀过程的略微扩增效果，表明C-CFMCR是庞大和可控生产KMNF3颗粒以及其他超细颗粒的有希望的技术。

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  • 来源
    《RSC Advances》 |2020年第20期|共13页
  • 作者

    Cheng Kun-Peng; Gu Ren-Jie; Wen Li-Xiong;

  • 作者单位

    Beijing Univ Chem Technol Res Ctr Minist Educ High Grav Engn &

    Technol Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Res Ctr Minist Educ High Grav Engn &

    Technol Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Res Ctr Minist Educ High Grav Engn &

    Technol Beijing 100029 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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