@article{Chen2022, 
author = {Yiming Chen and Minghao Guo and Lin Xu and Yuyang Cai and Xiaocong Tian and Xiaobin Liao and Zhaoyang Wang and Jiashen Meng and Xufeng Hong and Liqiang Mai},
title = {In-situ selective surface engineering of graphene micro-supercapacitor chips},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {2},
pages = {1492-1499},
keywords = {micro-supercapacitors, 3D-printing, in-situ modification, selective surface engineering, edge-welded graphene},
url = {https://www.sciopen.com/article/10.1007/s12274-021-3693-4},
doi = {10.1007/s12274-021-3693-4},
abstract = {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.}
}