气凝胶
材料科学
石墨烯
超级电容器
墨水池
氧化物
纳米技术
多孔性
3D打印
电容
重量分析
电阻率和电导率
化学工程
复合材料
冶金
电极
有机化学
电气工程
工程类
物理化学
化学
作者
Yanqiu Jiang,Zhen Xu,Tieqi Huang,Yingjun Liu,Fangwei Guo,Jiabin Xi,Weiwei Gao
标识
DOI:10.1002/adfm.201707024
摘要
Abstract Graphene aerogel microlattices (GAMs) hold great prospects for many multifunctional applications due to their low density, high porosity, designed lattice structures, good elasticity, and tunable electrical conductivity. Previous 3D printing approaches to fabricate GAMs require either high content of additives or complex processes, limiting their wide applications. Here, a facile ion‐induced gelation method is demonstrated to directly print GAMs from graphene oxide (GO) based ink. With trace addition of Ca 2+ ions as gelators, aqueous GO sol converts to printable gel ink. Self‐standing 3D structures with programmable microlattices are directly printed just in air at room temperature. The rich hierarchical pores and high electrical conductivity of GAMs bring admirable capacitive performance for supercapacitors. The gravimetric capacitance ( C s ) of GAMs is 213 F g −1 at 0.5 A g −1 and 183 F g −1 at 100 A g −1 , and retains over 90% after 50 000 cycles. The facile, direct 3D printing of neat graphene oxide can promote wide applications of GAMs from energy storage to tissue engineering scaffolds.
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