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 Ca²⁺ 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.

中文翻译：

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直接3D打印超轻氧化石墨烯气凝胶微晶格

石墨烯气凝胶微晶格（GAMs）具有低密度，高孔隙率，设计的晶格结构，良好的弹性和可调的电导率，因此在许多多功能应用中具有广阔的前景。制造GAM的以前的3D打印方法需要高含量的添加剂或复杂的工艺，从而限制了它们的广泛应用。在这里，一种简便的离子诱导胶凝方法被证明可以直接从基于氧化石墨烯（GO）的油墨中打印GAM。微量添加Ca ²⁺离子作为胶凝剂时，水性GO溶胶会转化为可印刷的凝胶油墨。具有可编程微晶格的自立式3D结构直接在室温下的空气中直接打印。GAM的丰富的层级孔隙和高电导率为超级电容器带来了令人赞叹的电容性能。重量比电容（C ^_小号GAMS的）是213 F G ^-1在0.5 A克^-1和183 F G ^-1在100克^-1，并保持50 000次循环后90％以上。简便，直接的3D氧化石墨烯直接印刷可以促进GAM从能量存储到组织工程支架的广泛应用。