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Hybrid Fe2O3 Nanoparticle Clusters/rGO Paper as an Effective Negative Electrode for Flexible Supercapacitors
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-10-04 00:00:00 , DOI: 10.1021/acs.chemmater.6b02585 Yating Hu 1 , Cao Guan 1 , Qingqing Ke 2 , Zhen Feng Yow 1 , Chuanwei Cheng 3 , John Wang 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-10-04 00:00:00 , DOI: 10.1021/acs.chemmater.6b02585 Yating Hu 1 , Cao Guan 1 , Qingqing Ke 2 , Zhen Feng Yow 1 , Chuanwei Cheng 3 , John Wang 1
Affiliation
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Flexible asymmetric supercapacitors (ASCs) are promising energy storage devices as they provide much higher energy density and wider applications than symmetric or nonflexible supercapacitors. While various positive electrode materials have been demonstrated with good performances, suitable and matching negative electrode materials are still desperately needed. In this work, Fe2O3 nanoparticle clusters are rationally coupled with reduced graphene oxide (rGO) sheets, leading to a highly flexible thin paper with excellent mechanical stability and electrical conductivity. The well dispersed and porous Fe2O3 nanoparticle clusters are composed of much smaller nanoparticles (∼30 nm), which provide a large electrode–electrolyte interface. When tested in 3 M KOH aqueous electrolyte, the hybrid Fe2O3 nanoparticle clusters/rGO paper demonstrates much improved volumetric capacitance in the negative voltage range, compared to pristine rGO paper (178.3 compared to 106.2 F cm–3 at 1 mV s–1 scan rate in cyclic voltammetry test). In addition, when assembled into ASC, both high volumetric energy and power density are obtained (0.056 Wh cm–3 and 6.21 W cm–3), which are much higher compared with that of the ASC used rGO paper as the negative electrode. The systematic investigations in understanding the synergistic effects of electrochemical behavior between the Fe2O3 nanoparticle clusters and rGO paper provide insights to future hybrid-type supercapacitor design.
中文翻译：
混合Fe 2 O 3纳米粒子簇/ rGO纸作为柔性超级电容器的有效负极
柔性非对称超级电容器（ASC）是有前途的储能设备，因为它们比对称或非柔性超级电容器具有更高的能量密度和更广泛的应用。尽管已经证明各种正极材料具有良好的性能，但是仍然迫切需要合适且匹配的负极材料。在这项工作中，Fe 2 O 3纳米粒子簇与还原的氧化石墨烯（rGO）板合理地结合在一起，从而产生了具有出色的机械稳定性和导电性的高柔韧性薄纸。均匀分散的多孔Fe 2 O 3纳米粒子簇由小得多的纳米粒子（约30 nm）组成，提供了较大的电极-电解质界面。当在3 M KOH水性电解质中进行测试时，与原始rGO纸相比，杂化的Fe 2 O 3纳米粒子簇/ rGO纸在负电压范围内显示出更大的体积电容（178.3相比，在1 mV s时为106.2 F cm –3 –循环伏安法测试中的扫描速率为1）。另外，当组装成ASC时，可以获得高体积能量和功率密度（0.056 Wh cm –3和6.21 W cm –3），与使用RGO纸作为负极的ASC相比要高得多。对了解Fe 2 O 3纳米簇和rGO纸之间电化学行为的协同效应的系统研究为未来的混合型超级电容器设计提供了见识。
更新日期：2016-10-04
中文翻译：
混合Fe 2 O 3纳米粒子簇/ rGO纸作为柔性超级电容器的有效负极
柔性非对称超级电容器（ASC）是有前途的储能设备，因为它们比对称或非柔性超级电容器具有更高的能量密度和更广泛的应用。尽管已经证明各种正极材料具有良好的性能，但是仍然迫切需要合适且匹配的负极材料。在这项工作中，Fe 2 O 3纳米粒子簇与还原的氧化石墨烯（rGO）板合理地结合在一起，从而产生了具有出色的机械稳定性和导电性的高柔韧性薄纸。均匀分散的多孔Fe 2 O 3纳米粒子簇由小得多的纳米粒子（约30 nm）组成，提供了较大的电极-电解质界面。当在3 M KOH水性电解质中进行测试时，与原始rGO纸相比，杂化的Fe 2 O 3纳米粒子簇/ rGO纸在负电压范围内显示出更大的体积电容（178.3相比，在1 mV s时为106.2 F cm –3 –循环伏安法测试中的扫描速率为1）。另外，当组装成ASC时，可以获得高体积能量和功率密度（0.056 Wh cm –3和6.21 W cm –3），与使用RGO纸作为负极的ASC相比要高得多。对了解Fe 2 O 3纳米簇和rGO纸之间电化学行为的协同效应的系统研究为未来的混合型超级电容器设计提供了见识。
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