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Solid-state yet flexible supercapacitors made by inkjet-printing hybrid ink of carbon quantum dots/graphene oxide platelets on paper

喷墨打印碳量子点/氧化石墨烯混合墨水制备纸基全固态柔性超级电容器

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Abstract

Paper-based flexible supercapacitors (SCs) show advantages due to the improved adhesion between paper and active materials, the simplified printing process and the lower cost, compared to other substrates such as plastics. Here we report the fabrication of solid-state yet flexible SCs by inkjetprinting a hybrid ink consisting of carbon quantum dots (CQDs) and graphene oxide (GO) platelets, followed by casting of polyvinyl alcohol (PVA)/sulfuric acid (H2SO4) gel electrolyte. The SC obtained from 100-time-printing of the hybrid ink shows a specific capacitance of ~1.0 mF cm−2 at a scan rate of 100 mV s−1, which is enhanced by nearly 150%; the whole device including paper substrate, gel electrolyte and active material demonstrates an energy density of 0.078 mW h cm−3 at a power density of 0.28 mW cm−3. In addition, the excellent mechanical strength of GO platelets ensures the good flexibility and mechanical robustness of the printed SCs, which show a retention of 98% in capacitance after being bended for 1,000 cycles at a bending radius of 7.6 mm. This study demonstrates a promising strategy for the large-scale preparation of low-cost, lightweight, and flexible/wearable energy storage devices based on carbon-based ink and paper substrate.

摘要

与其他柔性基底材料如塑料相比, 纸基柔性超级电容器具有印刷工艺简单、 制造价格低廉以及基底和活性材料之间具有更好的粘合力等优势. 在这里, 我们通过喷墨打印碳量子点(CQDs)和氧化石墨烯(GO)组成的混合墨水、 采用PVA/H2SO4为凝胶电解质制备了固态柔性超级电容器, 并对其性能进行了系统研究. 打印100次混合墨水获得的超级电容器在100 mV s−1的扫描速率下显示出~1.0 mF cm−2的比电容, 相比于纯GO墨水制备的超级电容器其比电容增加了150%; 通过进一步优化, 基于超级电容器整个装置(包括纸基、 凝胶电解质和活性材料)在0.28 mW cm−3的功率密度下表现出0.078 mW h cm−3的能量密度. 此外, GO薄片具有出色的机械强度, 确保超级电容器具有良好的柔韧性和机械强度, 在弯曲半径为7.6 mm的条件下弯曲1000次后, 仍保留98%的电容. 基于碳基墨水和纸张基材的喷墨打印的技术为低成本、 轻便、 灵活/可穿戴式储能装置的大规模制备提供了可能.

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Acknowledgements

This work was supported by the Thousand Talents Plan of China, the Program for New Century Excellent Talents in University, and the National Natural Science Foundation of China (51322204 and 51772282).

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Correspondence to Yanwu Zhu  (朱彦武).

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Jie Liu is a graduate student at the University of Science and Technology of China. She is currently studying in the Department of Materials Science and Engineering. Her research focuses on the energy storage of new carbon-based composites.

Yanwu Zhu is currently a Professor of the Department of Materials Science and Engineering, University of Science and Technology of China. He obtained a BSc degree in applied physics from the National University of Defense Technology in 2000, a MSc degree in physics from Peking University in 2003, and a PhD degree in physics from the National University of Singapore in 2007. He was a postdoctoral researcher at the National University of Singapore and at the University of Texas at Austin. In the last decade, he has been engaged in the preparation, characterization and property research of graphene and other novel carbon materials.

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Solid-state yet flexible supercapacitors made by inkjet-printing hybrid ink of carbon quantum dots/graphene oxide platelets on paper

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Liu, J., Ye, J., Pan, F. et al. Solid-state yet flexible supercapacitors made by inkjet-printing hybrid ink of carbon quantum dots/graphene oxide platelets on paper. Sci. China Mater. 62, 545–554 (2019). https://doi.org/10.1007/s40843-018-9309-x

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