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| 石墨烯/MnO2/纳米纤维素柔性电极材料的制备及其性能研究 |
| Preparation and Properties of Graphene/MnO2/Nanocellulose Flexible Electrode Material |
| 收稿日期：2020-06-04 |
| DOI：10.11980/j.issn.0254-508X.2020.10.002 |
| 关键词: 纳米纤维素 二氧化锰 石墨烯 柔性电极材料 |
| Key Words:nanocellulose manganese dioxide graphene flexible electrode |
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| 摘要:本研究采用真空抽滤的方法复合纳米纤维素、石墨烯和MnO2，制备石墨烯/MnO2/纳米纤维素柔性电极材料，探讨了在三者不同配比、不同电化学扫描速率和不同电流密度下对柔性电极材料性能的影响。结果表明，随着扫描速率的增加，材料的比电容逐渐下降，当扫描速率为10 mV/s时，材料（m(纳米纤维素) : m(石墨烯) : m(MnO2)=3∶5∶2）的比电容达117.5 F/g，当扫描速率为90 mV/s时，比电容降至40.4 F/g；随着电流密度的增大，材料的比电容逐渐下降，当电流密度为0.5 A/g时，材料(m(纳米纤维素) : m(石墨烯) : m(MnO2)=3∶3∶4）的比电容达112.5 F/g，当电流密度为1 A/g时，比电容降为20.5 F/g；随着石墨烯的减少，材料面电阻增大，当石墨烯配比为50%时，面电阻为15.60 Ω/□，当石墨烯配比为30%时，面电阻增至47.20 Ω/□；材料(m(纳米纤维素) : m(石墨烯) : m(MnO2)=3∶3∶4）循环充放电1次后，比电容为112.5 F/g，循环充放电100次后，比电容为90.9 F/g，表现出良好的充放电及循环使用性能。纳米纤维素对柔性电极材料的力学性能有极大影响，当纳米纤维素与石墨烯质量比为5∶5时，石墨烯/纳米纤维素柔性电极材料弹性模量达2184 MPa。 |
| Abstract:The graphene/MnO2/nanocellulose flexible electrode material was prepared by vacuum filtration. The effects of different ratios of nanocellulose， graphene and MnO2，electrochemical scanning rates and current densities on the properties of the electrode material were investigated. The results showed that when the scanning rate was 10 mV/s， the specific capacitance of the flexible composite electrode material （m（nano-cellulose）∶m（graphene）∶m（MnO2）=3∶5∶2） was as high as 117.5 F/g. With the increase of the scanning rate， the specific capacitance decreased gradually， and when the scanning rate was 90 mV/s， the specific capacitance decreased to 40.4 F/g；When the current density was 0.5 A/g， the specific capacitance of the flexible composite electrode material （m（nanocellulose）： m （graphene）： m（MnO2）=3∶3∶4） could be as high as 112.5 F/g. With the increase of the current density， the specific capacitance of the composite electrode decreased gradually， when the current density was 1 A/g， the specific capacitance of the composite material decreased to 20.5 F/g；with the decrease of graphene content， the area resistance increased gradually. When graphene ratio was 50%， the area resistance was 15.60 Ω/□，When graphene was 30%， the area resistance increased to 47.20 Ω/□；the specific capacitance of the flexible composite electrode material （m（nano-cellulose）： m（graphene）： m（MnO2） = 3∶3∶4） after one charge and discharge， the specific capacitance was 112.5 F/g， and after 100 cycles， the specific capacitance was 90.9 F/g， decreased by 19.2%， the composite electrode materials showed the good charge-discharge and cycle performance. Nanocellulose greatly affects the mechanical properties of flexible electrode materials. When the mass ratio of nanocellulose and graphene was 5∶5， the elastic modulus of graphene/nanocellulose flexible electrode materials reached the maximum value of 2184 MPa. |
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