Fiber-shaped supercapacitors

Electro chromic fiber-shaped supercapacitors. Adv. Mater. 26,8126-8132. 

Yang, Z.B., Deng, Chen, XL., Ren, L, Peng, H.S., 2013a. A highly stretchable, fiber-shaped supercapacitor. Angew. Chem. Int. Ed. 52,13453-13457. 

Jin, H. Y, L. M. Zhou, C. L. Mak, H. T. Huang, W. M. Tang, and H. L. W. Chan. 2015. High-performance fiber-shaped supercapacitors using carbon fiber thread (CFT) polyanilne and functionalized CRT electrodes for wearable/stretchable electronics. Nano Energy 11 662-670. 

Fiber-shaped supercapacitors have attractive applications in flexible devices. A high performance carbon nanotube (CNT)-based fibershaped supercapacitor has been developed by adding two redox additives simultaneously, i.e., poly(pyrrole) (PPY) to the electrodes and hydroquinone (HQ) to the electrolyte (8). 

A core-sheU CNT-PPY nanocomposite fiber was prepared using an electrochemical deposition method. In the fiber-shaped supercapacitor with CNT-PPY electrodes, PPY provides a pseudocapacitance due to its reversible dropping and de-dropping reactions in a poly(vinyl alcohol) (PVA)/H2S04 gel electrolyte. The capacitance of the CNT-PPY fiber-shaped supercapacitor reaches 36 Fg, which is 7 times higher than that of a pure CNT fiber-shaped supercapacitor. 

By adding HQ to the PVA/H2SO4 gel electrolyte in the CNT-PPY fiber-shaped supercapacitor, the specific capacitance reaches 56 Fg, which is 10 times higher than that of the pure CNT fibershaped supercapacitor. 

Deng, J., Zhang, Y., Zhao, Y, Chen, P., Cheng, X., Peng, H., 2015. A shape-memory supercapacitor fiber. Angew. Chem. Int. Ed. 54,15419-15423. 

Ren, J., Li, L., Chen, C., Chen,X., Cal, Z., Qiu, L.,Wang,Y, Zhu,X., Peng, H., 2013. Twisting carbon nanotube fibers for both wire-shaped micro-supercapacitor and micro-battery. Adv. Mater. 25, 1155-1159. 

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