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Substrate-Free and Shapeless Planar Micro-Supercapacitors

机译：无基板，无形状的平面微型超级电容器

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摘要

Micro-supercapacitors (MSCs), albeit powerful, are unable to broaden their potential applications primarily because they are not as flexible and morphable as electronics. To address this problem, a universal strategy to fabricate substrate-free, ultrathin, shapeless planar-MSCs with high-performance tenability under serious deformation is put forward. These represent a new class of "all-inside-one" film supercapacitors, achieved by encapsulating two-dimensional interdigital microelectrodes within chemically cross-linked polyvinyl-alcohol-based hydrogel electrolyte containing graphene oxide (GO). GO nanosheets significantly improve ionic conductivity, enhance the capacitance, and boost robustness of hydrogel electrolyte. Consequently, the entire MSC, while being only 37 mu m thick, can be crumpled and its shape can self-adjust through fluid channel ten times smaller than its original size without any damage, demonstrating shapelessness. Using MXene as active material, high single-cell areal capacitance of 40.8 mF cm(-2) is achieved from microelectrodes as thin as 5 mu m. Furthermore, to demonstrate wide applicability of this protocol, screen-printed graphene-based highly integrated MSCs connecting nine cells in series are fabricated to stably output a high voltage of 7.2 V while crumpling them from 0.11 to 0.01 cm(-3), manifesting superior performance uniformity. This protocol allows the coexistence of high performance with incredible flexibility that may greatly diversify MSCs' applications.
机译：微型超级电容器（MSC）尽管功能强大，但由于其不像电子设备那样灵活且易于变形，因此无法扩展其潜在应用。为了解决这个问题，提出了一种普遍的策略，即在严重变形的情况下，制造无基板，超薄，不变形的平面MSC，并具有高性能。这些代表了新型的“全内合一”膜超级电容器，它是通过将二维叉指式微电极封装在含有氧化石墨烯（GO）的化学交联的聚乙烯醇基水凝胶电解质中而实现的。 GO纳米片可显着改善离子电导率，增强电容并提高水凝胶电解质的坚固性。因此，整个MSC虽然只有37μm厚，但是可以被弄皱，并且其形状可以通过比其原始尺寸小十倍的流体通道进行自我调节而没有任何损坏，这表明其是无形的。使用MXene作为活性材料，可以通过薄至5μm的微电极实现40.8 mF cm（-2）的高单电池面电容。此外，为了证明该协议的广泛适用性，制造了串联连接九个电池的基于丝网印刷的基于石墨烯的高度集成的MSC，以稳定地输出7.2 V的高压，同时将其从0.11压至0.01 cm（-3），表现出优越的性能。性能均匀性。该协议允许高性能与令人难以置信的灵活性并存，这可能极大地使MSC的应用多样化。

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  • 来源
    《Advanced Functional Materials》 |2020年第7期|1908758.1-1908758.10|共10页
  • 作者

    Das Pratteek; Shi Xiaoyu; Fu Qiang; Wu Zhong-Shuai;

  • 作者单位

    Chinese Acad Sci Dalian Natl Lab Clean Energy Dalian Inst Chem Phys 457 Zhongshan Rd Dalian 116023 Peoples R China|Univ Chinese Acad Sci 19 A Yuquan Rd Beijing 100049 Peoples R China;

    Chinese Acad Sci Dalian Natl Lab Clean Energy Dalian Inst Chem Phys 457 Zhongshan Rd Dalian 116023 Peoples R China|Chinese Acad Sci State Key Lab Catalysis Dalian Inst Chem Phys 457 Zhongshan Rd Dalian 116023 Peoples R China|Univ Sci & Technol China Dept Chem Phys 96 JinZhai Rd Hefei 230026 Anhui Peoples R China;

    Chinese Acad Sci Dalian Natl Lab Clean Energy Dalian Inst Chem Phys 457 Zhongshan Rd Dalian 116023 Peoples R China|Chinese Acad Sci State Key Lab Catalysis Dalian Inst Chem Phys 457 Zhongshan Rd Dalian 116023 Peoples R China;

    Chinese Acad Sci Dalian Natl Lab Clean Energy Dalian Inst Chem Phys 457 Zhongshan Rd Dalian 116023 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    graphene; micro-supercapacitors; MXene; shapeless; substrate-free;

    机译：石墨烯微型超级电容器MXene;无形无底物;

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