用于柔性超级电容器的共价组装黑磷/导电 C3N4 混合材料具有超长 30,000 次循环耐久性,ACS Nano

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用于柔性超级电容器的共价组装黑磷/导电 C3N4 混合材料具有超长 30,000 次循环耐久性
ACS Nano ( IF 15.8 ) Pub Date : 2022-12-21 , DOI: 10.1021/acsnano.2c09970
Xipeng Xin ₁ , Yifeng Xu ₁ , Hexige Wuliji ₁ , Fei Sun ₁ , Qingdong Liu ₁ , Zezhen Wang ₁ , Tian-ran Wei ₁ , Xiaofeng Zhao ₁ , Xuefeng Song _{1,

2} , Lian Gao ₁

Affiliation

黑磷 (BP) 已被证明是一种很有前途的超级电容器电极材料。目前，其实际应用的主要限制是导电率低和结构稳定性差。因此，基于 BP 的超级电容器通常严重遭受低电容和较差的循环稳定性。在此，化学桥接的 BP/导电 gC ₃ N ₄ (BP/cC ₃ N ₄) hybrid 是通过简单的球磨方法开发的。通过球磨过程产生共价 P-C 键，有效地防止了 BP 由离子传输和扩散引起的结构变形。_{此外，由于BP与高导电cC 3} N ₄之间的充分耦合，整体电导率显着提高。此外，C原子周围不平衡的电荷分布可以诱导局部电场的产生，促进电极材料的电荷转移行为。因此，BP/cC ₃ N ₄ -20:1 柔性超级电容器 (FSC) 表现出 42.1 F/cm ^{3的出色体积电容}在0.005 V/s、5.85 mW h/cm ³的高能量密度和15.4 W/cm ³的最大功率密度。更重要的是，该器件具有出色的循环稳定性，在 30,000 次循环后没有电容损耗。

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Covalently Assembled Black Phosphorus/Conductive C3N4 Hybrid Material for Flexible Supercapacitors Exhibiting a Superlong 30,000 Cycle Durability

Black phosphorus (BP) has been demonstrated as a promising electrode material for supercapacitors. Currently, the main limitation of its practical application is the low electrical conductivity and poor structure stability. Hence, BP-based supercapacitors usually severely suffer from low capacitance and poor cycling stability. Herein, a chemically bridged BP/conductive g-C₃N₄ (BP/c-C₃N₄) hybrid is developed via a facile ball-milling method. Covalent P–C bonds are generated through the ball-milling process, effectively preventing the structural distortion of BP induced by ion transport and diffusion. In addition, the overall electrical conductivity is significantly enhanced owing to the sufficient coupling between BP and highly conductive c-C₃N₄. Moreover, the imbalanced charge distribution around the C atom can induce the generation of a local electric field, facilitating the charge transfer behavior of the electrode material. As a result, the BP/c-C₃N₄-20:1 flexible supercapacitor (FSC) exhibits an outstanding volumetric capacitance of 42.1 F/cm³ at 0.005 V/s, a high energy density of 5.85 mW h/cm³, and a maximum power density of 15.4 W/cm³. More importantly, the device delivers excellent cycling stability with no capacitive loss after 30,000 cycles.

更新日期：2022-12-21

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