国 际 竹 藤 组 织

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A Bamboo-Inspired Nanostructure Design for Flexible, Foldable, and Twistable Energy Storage Devices

竹藤论文

期刊/会议:

NANO LETTERS

Language:

English

作者:

Sun Yongming; Sills Ryan B.; Hu Xianluo; Seh Zhi Wei; Xiao Xu; Xui Henghui; Luo Wei; Jin Huanyu; Xin Ying; Li Tianqi; Zhang Zhaoliang; Zhou Jun; Cai Wei; Huang Yunhui; Cui Yi

年份:

2015

卷:

15

期:

6

页码:

3899-3906

关键词:

Bamboo-like carbon nanofibers; mechanical properties; supercapacitor; electrochemieal performances

Flexible energy storage devices are critical components for emerging flexible electronics. Electrode design is key in the development of all-solid-state supercapacitors with superior electrochemical performances and mechanical durability. Herein, we propose a bamboo-like graphitic carbon nanofiber with a well-balanced macro-, meso-, and microporosity, enabling excellent mechanical flexibility, foldability, and electrochemical performances. Our design is inspired by the structure of bamboos, where a periodic distribution of interior holes along the length and graded pore structure at the cross section not only enhance their stability under different mechanical deformation conditions but also provide a high surface area accessible to the electrolyte and low ion-transport resistance. The prepared nanofiber network electrode recovers its initial state easily after 3-folded manipulation. The mechanically robust membrane is explored as a free-standing electrode for a flexible all-solid-state supercapacitor. Without the need for extra support, the volumetric energy and power densities based on the whole device are greatly improved compared to the state-of-the-art devices. Even under continuous dynamic operations of forceful bending (90 degrees) and twisting (180 degrees), the as-designed device still exhibits stable electrochemical performances with 100% capacitance retention. Such a unique supercapacitor holds great promise for high-performance flexible electronics.