Preparation Of Ordered Mesoporous Carbon Composite And Its Energy Storage Properties

With the development of new energy industries,new energies are gradually applied in our daily life,taking place of traditional fossil fuels.However,owing to their low energy density,poor stability and scattered distribution,electrochemical energy storage systems?EESSs?are necessary for the use of them.While the electrode is the core component for these EESSs.Ordered mesoporous carbon is well-known for its high specific surface area,uniform pore distribution,favourable pore structure,stable mechanical property and structure controllable,showing an enormous potential in electrochemical application.Hence,developing ordered mesoporous carbon based EESSs will make a significant economic and social benefit of new energy industry.In this paper,ordered mesoporous carbons?Cx,x=0,5 and 10?were synthesized by a two-step impregnation method,using mesoporous silica SBA-15 as hard template,sucrose as carbon precursor and boric acid as pore-expanding agent.Cx possessed highly ordered mesopore with uniform pore size of 3.2 nm,4.0 nm and 5.0 nm,respectively.Then,the w%tBC/Cx was prepared by decorating different amount of tBC on Cx.Finally,the relationships between the distributions of tBC molecules in mesopore,pore width and the redox reaction were analyzed.Next,PANI/CMK-3 was synthesized through in-situ polymerization of aniline on CMK-3 by controlling the density gradient.CMK-3 acted as electronic channel,and the whisker-like PANI could efficiently increase the contact area with electrolyte.Finally,the optimum working voltage window of 0.1-2.45 V and electrochemical performances of PANI/CMK-3 as cathode of aluminum-ion battery were analyzed.At a current density of 0.1 A g^-1,the battery realized a specific capacity of 140 mA h g^-1.After 5000 cycles at a current density of 1 A g^-1,the capacity maintained at 89%.We further proposed a mechanism based on the doping/de-doping reaction of Cl^-,AlCl₄^-and Al₂Cl₇^-.