A wearable system based on core-shell structured peptide-Co9S8 supercapacitor and triboelectric nanogenerator
A wearable system based on core-shell structured peptide-Co9S8 supercapacitor and triboelectric nanogenerator
复制标题
基于核壳结构肽-Co9S8超级电容器和摩擦纳米发电机的可穿戴系统
DOI：
10.1016/j.nanoen.2019.104149
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发表时间：
2019-12
期刊：
影响因子：
17.6
通讯作者：
Wang Xinwei
中科院分区：
文献类型：
--
作者：
Xiong Wei;Hu Kuan;Li Zhe;Jiang Yixiang;Li Zigang;Li Zhou;Wang Xinwei
报道了一种用于超级电容器电极的新型多肽-Co9S8纳米块的核壳结构。这种纳米结构的多肽具有内在的柔性和生物相容性，非常适合用于可穿戴的超级电容器电极。然而，纳米结构多肽的应用往往受到其较低的功率密度和能量密度的限制，其长期稳定性也是一个令人担忧的问题。在本论文中，通过原子层沉积(ALD)在自组装的多肽纳米块上共形包覆一层Co9S8的薄壳层，得到了具有核-壳结构的多肽-Co9S8纳米块。壳层不仅可以保护多肽材料免受电解液的侵蚀，还可以为超级电容器提供额外的电容。由多肽-Co9S8纳米块制成的超级电容器在0.7 mA/cm2下的高容量为1.3 F/cm2，在5000次充放电循环后的容量保持率为96%，大大改善了循环稳定性。核壳型多肽-Co9S8纳米块还可以用活性碳制成高性能柔性固态不对称超级电容器(SC)。柔性非对称超级电容器还可以与摩擦电纳米发电机(TENG)相耦合，以提供灵活的自供电TEN/SC系统。Teng的2.7h连续充电的Teng/SC系统可以为红色发光二极管供电21 min，显示了其优异的自充电和能量供应性能，因此在未来的可穿戴电子应用中具有很大的前景。
We report a new core-shell structure of peptide-Co9S8nanobricks for supercapacitor electrode. The nanostructured peptide is intrinsically flexible and biocompatible, which is highly suited for wearable supercapacitor electrodes. However, the application of the nanostructured peptide is often limited by its generally low power density and energy density, and its long-term stability is also a concern. Herein, the core-shell structure of peptide-Co9S8nanobricks is synthesized by conformally coating a thin shell layer of Co9S8via atomic layer deposition (ALD) onto self-assembled peptide nanobricks. The shell layer can not only protect the peptide material from being attacked by the electrolyte but also contribute extra capacitance to the supercapacitor. The supercapacitors made of the peptide-Co9S8nanobricks exhibit a high capacitance of 1.3 F/cm2at 0.7 mA/cm2and a much improved cycling stability of 96% capacitance retention after 5000 charge-discharge cycling. High-performance flexible solid-state asymmetric supercapacitor (SC) can be also made from the core-shell peptide-Co9S8nanobricks with activated carbon. The flexible asymmetric supercapacitor can also be coupled with a triboelectric nanogenerator (TENG) to afford a flexible self-powered TENG/SC system. The TENG/SC system with 2.7-h continuously charging by TENG can power a red LED for 21 min, which demonstrates its excellent performance of self-charging and energy-supplying, and therefore it is of great promise for future wearable electronics applications.
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