Chen Wen, Jiang Shunqiong, Xiao Han, Zhou Xufeng, Xu Xueyan, Yang Jingdong, Siddique Ahmad Hassan, Liu Zhaoping
Key Laboratory of Graphene Technologies and Applications of Zhejiang Province, CAS Engineering Laboratory for Graphene, Advanced Li-ion Battery Engineering Laboratory of Zhejiang Province, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Zhejiang, 315201, P. R. China.
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences (UCAS), Beijing, 100049, P. R. China.
ChemSusChem. 2021 Feb 5;14(3):938-945. doi: 10.1002/cssc.202002641. Epub 2020 Dec 16.
Conjugated polymers have been widely adopted as active materials in hydrogel-based stretchable supercapacitors, but the relatively low conductivity and poor structural stability limit their applications. Herein, highly conductive graphene was incorporated as a substrate to anchor polyaniline (PANI) in a hydrogel-based stretchable electrode. Graphene not only provided an effective conducting network in the electrode, but also stabilized PANI during repeating charge-discharge processes due to strong π-π interaction between graphene and PANI. The obtained electrode showed high capacitance of 500.13 mF cm and 100 % capacitance retention after 10000 charge-discharge cycles. The symmetrical supercapacitor using this novel stretchable electrode showed a high capacitance of 218.26 mF cm , high capacitance retention of 43 % even when stretched at 150 % strain, and no capacitance decay when stretched to 100 % and then released to 0 % repeatedly for 2000 cycles, all of which were much better than the device based on the electrode without adding graphene. Such outstanding electrochemical performance shows the great application potential of highly conductive graphene in conjugated polymer-based stretchable energy storage devices.
共轭聚合物已被广泛用作水凝胶基可拉伸超级电容器的活性材料，但相对较低的电导率和较差的结构稳定性限制了它们的应用。在此，将高导电性的石墨烯作为基底引入，以在水凝胶基可拉伸电极中锚定聚苯胺（PANI）。石墨烯不仅在电极中提供了有效的导电网络，而且由于石墨烯与聚苯胺之间强烈的π-π相互作用，在重复充放电过程中稳定了聚苯胺。所制备的电极显示出500.13 mF cm的高电容，并且在10000次充放电循环后电容保持率为100%。使用这种新型可拉伸电极的对称超级电容器显示出218.26 mF cm的高电容，即使在150%应变下拉伸时仍具有43%的高电容保持率，并且在拉伸至100%然后反复释放至0%共2000次循环时没有电容衰减，所有这些性能都远优于基于未添加石墨烯的电极的器件。这种优异的电化学性能表明高导电性石墨烯在共轭聚合物基可拉伸储能器件中具有巨大的应用潜力。
