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首页> 外文期刊>RSC Advances >Electrodeposition of honeycomb-shaped NiCo2O4 on carbon cloth as binder-free electrode for asymmetric electrochemical capacitor with high energy density
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Electrodeposition of honeycomb-shaped NiCo2O4 on carbon cloth as binder-free electrode for asymmetric electrochemical capacitor with high energy density

机译：碳布上蜂窝状NicO2O4的电沉积作为无电能密度的不对称电化学电容器的无粘合剂电极

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摘要

Combining high-capacitive metal oxides and excellent conductive carbon substrates is a very significant strategy to achieve high-performance electrodes for electrochemical capacitors (ECs). Herein, the bimetallic (Ni, Co) hydroxide is uniformly grown on the electro-etched carbon cloth (CC) by a facile co-electrodeposition method, and then the honeycomb-shaped NiCo2O4/CC (HSNC) composite is formed by transforming the hydroxide precursor into its bimetallic oxides through the subsequent thermal treatment. The special structure of the HSNC as binder-free electrode is responsible for its excellent electrochemical performance with carbon-like power feature. The experimental results show that HSNC electrode exhibits a high specific capacitance with remarkable cycle stability (94.3% after 10 000 cycles at 10 A g(-1)) in the three-electrode configuration. To evaluate further the capacitive performance of the as-prepared binder-free electrode in a full cell set-up, an asymmetric electrochemical capacitor (AEC) is assembled by using the HSNC as the positive electrode and reduced graphene oxide/carbon cloth (rGO/CC) as the negative electrode in KOH electrolyte. The as-assembled device presents an energy density as high as 32.4 W h kg(-1) along with power density of 0.75 kW kg(-1), comparing with nickel-metal hyoride battery (Ni-MH) batteries (30.0 W h kg(-1) at 0.35 kW kg(-1)). Even at the power density of 37.7 kW kg(-1) (50-time increase, a full charge-discharge within 3.5 s), energy density still holds at 17.8 W h kg(-1), indicating an outstanding rate capability. Furthermore, the as-fabricated device exhibits a long cycle lifetime (76.5% after 10 000 cycles at 3 A g(-1)) with a cell voltage of 1.5 V.
机译：组合高电容金属氧化物和优异的导电碳基材是实现电化学电容器（ECS）的高性能电极的非常显着的策略。这里，通过容易的共电沉积方法均匀地在电蚀刻的碳布（CC）上均匀生长双金属（Ni，Co），然后通过转化氢氧化物形成蜂窝状的NicO 2 O 4 / Cc（HSNC）复合材料通过随后的热处理进入其双金属氧化物中的前体。 HSNC作为无粘合剂电极的特殊结构负责其具有碳状功率特征的优异的电化学性能。实验结果表明，在三电极配置中，HSNC电极具有显着的循环稳定性（在10 000℃）中具有显着的循环稳定性（94.3％）。为了进一步评估所有细胞设置中的制备的粘合剂电极的电容性能，通过使用HSNC作为正极和还原的石墨烯/碳布（RGO /）组装不对称电化学电容器（AEC）（Rgo / CC）作为KOH电解质中的负极。组装装置呈现高达32.4WH kg（-1）的能量密度，以及功率密度为0.75 kW kg（-1），与镍金属横梁电池（ni-mh）电池相比（30.0 w h kg（-1）0.35 kW kg（-1））。即使在37.7 kW kg（-1）的功率密度，（50次增加，3.5秒内的完全电荷放电，能量密度仍然在17.8 w h kg（-1）中，表示出色的速率能力。此外，使用电池电压为1.5V的电池电压，AS制造的器件表现出长周期寿命（在3Ag（-1）的10 000周期之后76.5％）。

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  • 来源
    《RSC Advances》 |2016年第44期|共12页
  • 作者

    An Yufeng; Hu Zhongai; Guo Bingshu; An Ning; Zhang Yadi; Li Zhimin; Yang Yuying; Wu Hongying;

  • 作者单位

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Key Lab Ecoenvironm Related Polymer Mat Key Lab Polymer Mat Gansu Prov Minist Educ Coll Chem &

    Chem Engn Lanzhou 730070 Gansu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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