Graphite foils have displayed a large potential in a variety of applications. However, their poor mechanical performance strongly limits their applications in flexible devices. Here, a hierarchical nacre‐like graphite foil with greatly improved mechanical properties (tensile strength: 54 MPa, toughness: 513 kJ m⁻³) and high conductivity (1400 S cm⁻¹) is reported. The biomimetic graphite foil has a brick‐and‐mortar‐like structure with exfoliated expanded graphite (EEG) platelets as bricks and reduced graphene oxide (rGO) as mortar, in which rGO sheets efficiently fill the interspaces and voids between EEG platelets and bridge the adjacent EEG platelets, synergistically reinforcing its mechanical performance and enhancing its conductivity. When evaluated as a current collector for flexible and foldable supercapacitors, the device delivers a long cycle life over 5000 cycle folding tests with 100% capacitance retention. The biomimetic graphite foil provides a new material platform for flexible and wearable electronic devices.

中文翻译：

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具有高可折叠性和导电性的仿生石墨箔

石墨箔在各种应用中显示出巨大的潜力。但是，它们较差的机械性能极大地限制了它们在柔性设备中的应用。此处，是一种分层的珍珠质石墨箔，具有极大改善的机械性能（抗张强度：54 MPa，韧性：513 kJ m ^-3）和高电导率（1400 S cm ^-1））被报告。仿生石墨箔具有砖瓦状结构，具有片状脱落的膨胀石墨（EEG）片和作为灰浆的还原型氧化石墨烯（rGO），其中，rGO片有效填充了EEG血小板之间的空隙和空隙并桥接了相邻的EEG血小板，可协同增强其机械性能并增强其电导率。当评估为柔性和可折叠超级电容器的集电器时，该器件在5000次循环折叠测试中具有100％的电容保持率，可提供较长的循环寿命。仿生石墨箔为柔性和可穿戴电子设备提供了新的材料平台。