石墨烯/聚(N-异丙基)丙烯酰胺复合薄膜电极材料的制备

Preparation of Graphene/ Polyacrylamide(Poly-isopropylacrylamide) Composite Film Electrode Materials

石墨烯凭借巨大的比表面积和优良的电性能在储能领域受到广泛的关注,但团聚问题限制了其应用发展。针对由Hummers法合成的石墨烯分别采用聚丙烯酰胺和聚N-异丙基丙烯酰胺进行改性,制得石墨烯/聚丙烯酰胺、石墨烯/聚N-异丙基丙烯酰胺自支撑薄膜,以亲水大分子链网络在石墨烯片层间阻隔其层间团聚。结果表明,改性后的石墨烯薄膜具有优异的保水性,当其作为电极材料时显现出良好的循环稳定性和较大的比电容。其中,石墨烯/聚N-异丙基丙烯酰胺自支撑薄膜处于电流密度为0.2 A/g时的电极比电容可达273.8 F/g。

Graphene attracts great attention gradually in the field of energy storage because of its large specific surface area and fine electrical properties.However the graphene agglomeration restricts its further development.In this paper,we prepared a modified self-supporting grapheme film successfully by using amphiphilic polyacrylamide(PAM)and poly-isopropylacrylamide(PNIPAM)modify graphene fabricated by Hummers,which uses interpenetrating polymer networks as support to avoid graphene agglomeration.As the result,the modified grapheme film exhibits high water retention property.Moreover,the modified-graphene film shows good cycle stability and excellent specific capacitance as electrode material.Specially,the graphene/PNIPAM self-supporting grapheme film has specific capacitance 273.8 F/g under the electric current density 0.2 A/g.