Zou Xinquan, Song Yaoting, Zhang Yi, Xing Lu, Li Peiyuan, Cheng Jinggang, Feng Yuwei, Wang Kun, Liu Wenxiu, Wang Jikui
School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
Int J Biol Macromol. 2024 Dec;282(Pt 4):136995. doi: 10.1016/j.ijbiomac.2024.136995. Epub 2024 Oct 29.
As a new type of energy storage device, supercapacitors have attracted more and more attention due to their excellent performance. However, the current electrode materials have limited specific surface area and cannot meet the needs of high energy storage. The aerogel material is a 3D network structure containing interconnected micro-nano structures, and also has hierarchical pores on the micro, meso and macro scales. The microporous and mesoporous structures can provide high specific surface area, while the macropores provide channels for the entry of active substances. In this study, calcium alginate (CA)/polyaniline (PANI)/reduced graphene oxide (RGO) aerogels based on double network structure with high mechanical property and excellent electrochemical performance are successfully constructed by sol-gel method. Due to the double network structure, the CA/PANI/RGO aerogel exhibits self-supported 3D porous network structures with high surface areas (330.3 m/g). CA/PANI/RGO composite aerogel electrode shows high specific capacitance (908 F/g at 1 A/g) and excellent rate performance. The initial capacitance of more than 80 % can be maintained after 10,000 times of charge/discharge cycle test. Most importantly, the assembled flexible solid-state supercapacitor has high specific capacitance (885 F/g at 1 A/g) and mechanical flexibility (92.6 % of the capacitance retention after 1000 bending cycles).
作为一种新型储能装置，超级电容器因其优异的性能而受到越来越多的关注。然而，目前的电极材料比表面积有限，无法满足高储能的需求。气凝胶材料是一种包含相互连接的微纳结构的三维网络结构，在微观、介观和宏观尺度上还具有分级孔隙。微孔和介孔结构可提供高比表面积，而大孔则为活性物质的进入提供通道。在本研究中，通过溶胶-凝胶法成功构建了具有高机械性能和优异电化学性能的基于双网络结构的海藻酸钙（CA）/聚苯胺（PANI）/还原氧化石墨烯（RGO）气凝胶。由于双网络结构，CA/PANI/RGO气凝胶呈现出自支撑的三维多孔网络结构，具有高比表面积（330.3 m²/g）。CA/PANI/RGO复合气凝胶电极显示出高比电容（1 A/g时为908 F/g）和优异的倍率性能。在10000次充放电循环测试后，初始电容可保持80%以上。最重要的是，组装的柔性固态超级电容器具有高比电容（1 A/g时为885 F/g）和机械柔韧性（1000次弯曲循环后电容保持率为92.6%）。
