文献类型：期刊文献

中文题名：Dominant role of wettability in improving the specific capacitance

英文题名：Dominant role of wettability in improving the specific capacitance

作者：Tongtong Liu[1,2];Kai Wang[1,2];Yongxiu Chen[1,2];Shuangliang Zhao[3];Yongsheng Han[1,2]

机构：[1]State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences;[2]School of Chemical Engineering, University of Chinese Academy of Sciences;[3]State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology

年份：2019

卷号：4

期号：2

起止页码：171

中文期刊名：Green Energy & Environment

外文期刊名：绿色能源与环境（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2019_2020】；

基金：financial support from National Natural Science Foundation of China(91534123,91834303,U1862117);supported by the State Key Laboratory of Multiphase Complex Systems(MPCS-2017-A-01);support by State key laboratory of Multiphase Complex Systems(MPCS)Facility Upgradation Program

语种：英文

中文关键词：Supercapacitor;Energy;density;Specific;capacitance;Effective;surface;area;Wettability

外文关键词：Supercapacitor;Energy density;Specific capacitance;Effective surface area;Wettability

摘要：Here we report a strategy to enhance the energy density of supercapacitors by increasing the utilization rate of the specific surface area(SSA)via wettability improvement. The nonporous gold(NPG) film is used as the electrodes and the ionic liquid [EMIM]BF4 is the electrolyte. When the electrode is coated by paraffin, an increase of the contact angle leads to a remarkable reduction of the specific capacitance. While when acetonitrile is added into the electrolyte, the contact angle is decreased and the utilization rate of SSA is improved, which results in an increase of the specific capacitance. The addition of isopropyl acetate into the electrolyte leads to a further increase of the specific capacitance. To generalize the role of the wettability in improving the energy density, a carbon-based electrode is evaluated in the solution of potassium hydroxide. An addition of propyl alcohol into the potassium hydroxide solution leads to an increase of the specific capacitance, as well as a long-term stability of the supercapacitor. The role of conductivity in this study is excluded by designing experiments. This paper highlights the significance of wettability in determining the specific capacitance, showing an alternative to improve the energy density of supercapacitors.
Here we report a strategy to enhance the energy density of supercapacitors by increasing the utilization rate of the specific surface area(SSA)via wettability improvement. The nonporous gold(NPG) film is used as the electrodes and the ionic liquid [EMIM]BF4 is the electrolyte. When the electrode is coated by paraffin, an increase of the contact angle leads to a remarkable reduction of the specific capacitance. While when acetonitrile is added into the electrolyte, the contact angle is decreased and the utilization rate of SSA is improved, which results in an increase of the specific capacitance. The addition of isopropyl acetate into the electrolyte leads to a further increase of the specific capacitance. To generalize the role of the wettability in improving the energy density, a carbon-based electrode is evaluated in the solution of potassium hydroxide. An addition of propyl alcohol into the potassium hydroxide solution leads to an increase of the specific capacitance, as well as a long-term stability of the supercapacitor. The role of conductivity in this study is excluded by designing experiments. This paper highlights the significance of wettability in determining the specific capacitance, showing an alternative to improve the energy density of supercapacitors.