Xu Shichen, Shen Chao, Peng Zhisheng, Wu Jiandong, Chen Zhuo, Zhang Xinyu, Ji Nannan, Jian Muqiang, Wu Mingmao, Gao Xin, Zhang Jin
Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
School of Materials Science and Engineering, Peking University, Beijing 100871, P. R. China.
ACS Nano. 2024 Sep 3;18(35):24154-24161. doi: 10.1021/acsnano.4c05493. Epub 2024 Aug 20.
Fiber-shaped electrochemical capacitors (FSECs) have garnered substantial attention to emerging portable, flexible, and wearable electronic devices. However, achieving high electronic and ionic conductivity in fiber electrodes while maintaining a large specific surface area is still a challenge for enhancing the capacitance and rapid response of FSECs. Here, we present an electric-field-assisted cold-wall plasma-enhanced chemical vapor (EFCW-PECVD) method for direct growth of vertical graphene (VG) on fiber electrodes, which is incorporated in the FSECs. The customized reactor mainly consists of two radio frequency coils: one for plasma generation and the other for substrate heating. Precise temperature control can be achieved by adjusting the conductive plates and the applied power. With induction heating, only the substrate is heated to above 500 °C within just 5 min, maintaining a low temperature in the gas phase for the growth of VG with a high quality. Using this method, VG was easily grown on metallic fibers. The VG-coated titanium fibers for FSECs exhibit an ultrahigh rate performance and quick ion transport, enabling the conversion of an alternating current signal to a direct current signal and demonstrating outstanding filtering capabilities.
纤维状电化学电容器（FSECs）在新兴的便携式、柔性和可穿戴电子设备方面已引起了广泛关注。然而，在保持大比表面积的同时，在纤维电极中实现高电子和离子导电性仍然是提高FSECs电容和快速响应的一个挑战。在此，我们提出一种电场辅助冷壁等离子体增强化学气相沉积（EFCW-PECVD）方法，用于在纤维电极上直接生长垂直石墨烯（VG），该纤维电极被集成到FSECs中。定制的反应器主要由两个射频线圈组成：一个用于产生等离子体，另一个用于加热衬底。通过调节导电板和施加的功率可以实现精确的温度控制。通过感应加热，仅在5分钟内就能将衬底加热到500℃以上，在气相中保持低温以高质量生长VG。使用这种方法，VG很容易在金属纤维上生长。用于FSECs的涂覆VG的钛纤维表现出超高的倍率性能和快速的离子传输，能够将交流信号转换为直流信号，并展示出出色的滤波能力。
