For the first time, zero‐dimensional (0D) CoFe₂O₄ nanoparticles, one‐dimensional (1D) polyacrylonitrile‐based carbon fibers (PBCF), and two‐dimensional (2D) reduced graphene oxide (RGO) nanosheets were used as building blocks to create an integrated ternary nanocomposite paper with a nacre‐like microstructure for flexible supercapacitors. Inspired by the “mortar‐brick” toughening mechanism of nacre, hydrogen and covalent bonding were further introduced into the bioinspired paper with 0D CoFe₂O₄, 1D PBCF, and 2D RGO to realize increased mechanical properties through the synergistic toughening effects of the interfacial interactions of hydrogen and covalent bonding. These collaboratively lead to enhanced mechanical properties such as high tensile strength, exceptional toughness, and eminent electrical conductivity. When used as a free‐standing flexible electrode, the bioinspired interconnected 3D network exhibits an outstanding volumetric capacity of 240 F ⋅ cm⁻³ at 10 mV ⋅ s⁻¹ and an excellent cycle life of 2000 cycles for a flexible symmetric supercapacitor device (SSCD). Remarkably, the fabricated flexible SSCD can be cycled reversibly in the voltage range of −1 to 0 V and shows a maximum energy density of 33.33 mW ⋅ h cm⁻³, suggesting great potential for practical applications in flexible energy storage devices.

中文翻译：

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生物启发的氧化石墨烯/聚丙烯腈基碳纤维/ CoFe2O4纳米复合材料，用于具有高强度和电容的柔性超级电容器

首次使用零维（0D）CoFe ₂ O ₄纳米颗粒，一维（1D）聚丙烯腈基碳纤维（PBCF）和二维（2D）还原氧化石墨烯（RGO）纳米片作为建筑材料块以创建具有类似珍珠质微结构的集成三元纳米复合纸，用于柔性超级电容器。受珍珠母的“砂浆-砖”增韧机理的启发，氢和共价键被进一步引入了具有0D CoFe ₂ O ₄的生物启发纸中。，1D PBCF和2D RGO通过氢与共价键的界面相互作用的协同增韧作用来实现增强的机械性能。这些共同提高了机械性能，例如高拉伸强度，出色的韧性和出色的导电性。当作为一个独立的柔性电极使用的，仿生互连3D网络表现出器240f⋅cm的杰出的体积容量^-3以10mV⋅小号^-1和2000次循环用于柔性对称超级电容器装置优异的循环寿命（SSCD ）。值得注意的是，所制造的柔性SSCD可以在-1至0 V的电压范围内可逆循环，并显示出33.33 mW⋅h cm ^-3的最大能量密度。，表明在挠性储能设备中有实际应用的巨大潜力。