Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China.
Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China; Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong Special Administrative Region.
J Colloid Interface Sci. 2019 Feb 15;536:291-299. doi: 10.1016/j.jcis.2018.10.044. Epub 2018 Oct 19.
Flexible supercapacitor plays a progressively more important part in power source for smart electronic devices and how to enhance its energy density is the urgent issue to be addressed. Hence, a hybrid electrode of Polypyrrole@reduced graphene oxide hydrogel (PPy@rGOH) is synthesized via a combine hydrothermal treatment of GO solution to assemble hydrogel and subsequently in-situ electropolymerization preparation of PPy on the surface of graphene. Through controlling the time of electropolymerization, the resultant PPy@rGOH-20 s with high specific surface area exhibits an excellent specific capacitance of 340 F g at a current density of 1 A g and superior cycling stability of 87.4% capacitance retention after 10,000 charging/discharging cycles at 3 A g in 1 M KNO. The assembled flexible asymmetric supercapacitor (FASC) by employing the PPy@rGOH-20s as positive electrode and pure rGOH as negative electrode presents a maximum operational voltage window of 1.6 V and high energy density of 46.9 W h kg, which is higher than polymer/carbon-based supercapacitors previously reported.
柔性超级电容器在智能电子设备的电源中扮演着越来越重要的角色，如何提高其能量密度是亟待解决的问题。因此，通过将 GO 溶液进行水热处理以组装水凝胶，随后在石墨烯表面原位电聚合制备 PPy，合成了一种聚吡咯@还原氧化石墨烯水凝胶（PPy@rGOH）的混合电极。通过控制电聚合的时间，具有高比表面积的所得 PPy@rGOH-20s 在 1 A g 的电流密度下表现出优异的比电容为 340 F g，在 3 A g 下 10,000 次充放电循环后，电容保持率为 87.4%，循环稳定性优异。采用 PPy@rGOH-20s 作为正极和纯 rGOH 作为负极组装的柔性不对称超级电容器（FASC）具有 1.6 V 的最大工作电压窗口和 46.9 Wh kg 的高能量密度，高于以前报道的聚合物/碳基超级电容器。
