摘要
Surface modification of graphene oxide(GO)is a powerful strategy to develop its energy density for electrochemical energy storage.However,pre-modified GO always exhibits unsatisfactory hydrophilia and its ink-relevant utilization is extremely limited.Although GO ink is widely utilized in fabricating micro energy storage devices via extrusion-based 3D-printing,simultaneously obtaining satisfactory hydrophilia and high energy density still remains a challenge.In this work,an in-situ surface engineering strategy was employed to enhance the performance of GO micro-supercapacitor chips.Three dimensionally printed GO micro-supercapacitor chips were treated with pyrrole monomer to achieve selective and spontaneous anchoring of polypyrrole on the microelectrodes without affecting interspaces between the finger electrodes.The interface-reinforced graphene scaffolds were edge-welded and exhibited a considerably improved specific capacitance,from 13.6 to 128.4 mF·cm^(-2).These results are expected to provide a new method for improving the performance of micro-supercapacitors derived from GO inks and further strengthen the practicability of 3D printing techniques in fabricating energy storage devices.
基金
supported by the National Key Research and Development Program of China(No.2020YFA715000)
the National Natural Science Foundation of China(No.51802239)
the National Key Research and Development Program of China(No.2019YFA0704902)
Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(Nos.XHT2020-005 and XHT2020-003)
the Natural Science Foundation of Hubei Province(No.2019CFA001)
the Fundamental Research Funds for the Central Universities(Nos.2020III011GX,2020IVB057,2019IVB054,2019III062JL,and 2019-YB-008).
