Abstract
Conventional carbon materials cannot combine high density and high porosity, which are required in many applications, typically for energy storage under a limited space. A novel highly dense yet porous carbon has previously been produced from a three-dimensional (3D) reduced graphene oxide (r-GO) hydrogel by evaporation-induced drying. Here the mechanism of such a network shrinkage in r-GO hydrogel is specifically illustrated by the use of water and 1,4-dioxane, which have a sole difference in surface tension. As a result, the surface tension of the evaporating solvent determines the capillary forces in the nanochannels, which causes shrinkage of the r-GO network. More promisingly, the selection of a solvent with a known surface tension can precisely tune the microstructure associated with the density and porosity of the resulting porous carbon, rendering the porous carbon materials great potential in practical devices with high volumetric performance.
摘要
以两亲性氧化石墨烯为结构单元, 可控组装构建三维网络石 墨烯水凝胶, 动网络致密化, 获得高密多孔碳, 解决 了传统多孔碳电极体积容量低的应用瓶颈. 本文旨在探究氧化石 墨烯水凝胶致密化机理, 阐明了毛细作用力是使溶剂脱出并引发 石墨烯网络收缩的驱动力. 溶剂表面张力决定毛细作用力, 因此通 过调节溶剂表面张力或采用不同表面张力的溶剂, 可以实现“孔”与 “密”的“收放自如”调控, 从而得到不同密度和孔隙率的高密多孔碳, 实现高密和多孔连续精确调控. 氧化石墨烯水凝胶的毛细收缩也 为纳米材料致密化提供了方法论支持.
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Acknowledgements
This work was supported by the National Natural Science Fund for the Distinguished Young Scholars, China (51525204), the National Natural Science Foundation of China (51702229 and 51872195), the CAS Key Laboratory of Carbon Materials (KLCM KFJJ1704).
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Yang QH conceived and supervised the study. Qi C and Tao Y designed the experiment and Qi C carried out it. Qi C, Luo C, Tao Y and Yang QH discussed the data. Lv W, Zhang C, Deng Y, Li H, Han J, Ling G provided the technical support and commented the results.
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The authors declare no conflict of interest.
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Experimental details and supporting data are available in the online version of the paper.
Changsheng Qi received his Bachelor’s degree and Master’s degree of applied chemistry from the North University of China in 2005 and 2008, respectively. He is a PhD candidate under the guidance of Prof. Quan-Hong Yang. His research interest focuses on the liquid phase assembly and mechanism of GO, and its applications.
Chong Luo received his Bachelor’s degree of materials science and engineering from the Central South University in 2013 and now is a PhD candidate under the guidance of Prof. Quan-Hong Yang and Prof. Wei Lv. His research interest focuses on the liquid phase assembly of GO and mechanism study on energy storage.
Ying Tao is an associate professor at the School of Chemical Engineering and Technology at Tianjin University. Her main research interests focus on the assembly of low dimensional materials, carbon-based materials and their applications in electrochemical energy storage and environmental remediation.
Quan-Hong Yang joined Tianjin University as a full professor in 2006 and became a Chair Professor in the same university in 2016. His research focuses on novel functional carbon materials with the applications in energy and environmental fields. Specifically, he has made significant advances in high volumetric performance EES devices and the catalysis in lithiumsulfur batteries. See http://nanoyang.tju.edu.cn for more details about Nanoyang Group.
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Qi, C., Luo, C., Tao, Y. et al. Capillary shrinkage of graphene oxide hydrogels. Sci. China Mater. 63, 1870–1877 (2020). https://doi.org/10.1007/s40843-019-1227-7
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DOI: https://doi.org/10.1007/s40843-019-1227-7