Free‐Standing 3D Nanoporous Duct‐Like and Hierarchical Nanoporous Graphene Films for Micron‐Level Flexible Solid‐State Asymmetric Supercapacitors |
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| Authors: | Kaiqiang Qin Enzuo Liu Jiajun Li Jianli Kang Chunsheng Shi Chunnian He Fang He Naiqin Zhao |
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| Affiliation: | 1. School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, China;2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China;3. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin, China |
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| Abstract: | High energy density and power density within a limited volume of flexible solid‐state supercapacitors are highly desirable for practical applications. Here, free‐standing high‐quality 3D nanoporous duct‐like graphene (3D‐DG) films are fabricated with high flexibility and robustness as the backbones to deposit flower‐like MnO2 nanosheets (3D‐DG@MnO2). The 3D‐DG is the ideal support for the deposition of large amount of active materials because of its large surface area, appropriate pore structure, and negligible volume compared with other kinds of carbon backbones. Moreover, the 3D‐DG preserve the distinctive 2D coherent electronic properties of graphene, in which charge carriers move rapidly with a small resistance through the high‐quality and continuous chemical vapor deposition‐grown graphene building blocks, which results in a high rate performance. Marvelously, ultrathin (≈50 μm) flexible solid‐state asymmetric supercapacitors (ASCs) using 3D‐DG@MnO2 as the positive electrode and 3D hierarchical nanoporous graphene films as the negative electrode display ultrahigh volumetric energy density (28.2 mW h cm?3) and power density (55.7 W cm?3) at 2.0 V. Furthermore, as‐prepared ASCs show high cycle stability clearly demonstrating their broad applications as power supplies in wearable electronic devices. |
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| Keywords: | chemical vapor deposition hierarchical nanoporous graphene nanoporous copper nanoporous duct‐like graphene solid‐state asymmetric supercapacitors |
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