journal homepage: www.elsevier.com/locate/nanoenergy Available online at www.sciencedirect.com RAPID COMMUNICATION Scalable non-liquid-crystal spinning of locally aligned graphene fibers for high-performance wearable supercapacitors Shaohua Chen a , Wujun Ma a , Yanhua Cheng a , Zhe Weng b , Bin Sun a , Lu Wang a , Wenping Chen a , Feng Li b , Meifang Zhu a,n , Hui-Ming Cheng b,n a State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science & Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China b Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China Received 5 March 2015; received in revised form 4 May 2015; accepted 7 May 2015 Available online 21 May 2015 KEYWORDS Graphene fibers; Liquid crystals; Wet spinning; Wearable supercapacitors Abstract One-dimensional graphene fibers have attracted increasing interests due to their extraordinary mechanical strength, electrical conductivity and flexibility compared with two-dimensional graphene films/papers and three-dimensional foams/hydrogels/aerogels. Here, we developed a scalable non-liquid-crystal spinning process for the production of continuous graphene fibers with tailored structure for high-performance wearable supercapacitors. These fibers possessed surfaces with bark-like fine microstructure and different shaped cross-sections with locally aligned dense pores, depending on the jet stretch ratio (R) during spinning. Owing to this unique structure facilitating the access to, and diffusion of electrolyte ions, the specific capacitance reached 279 F g 1 (340 F cm 3 ) at a current density of 0.2 A g 1 (0.244 A cm 3 ) in 1MH 2 SO 4 when R = 1.0. A flexible solid-state fiber supercapacitor assembled from these fibers showed a specific capacitance and energy density of 226 F cm 3 and 7.03 mWh cm 3 at 0.244 A cm 3 , respectively. We further demonstrated the proof-of-concept of wearable energy- storage by sewing three solid-state yarn supercapacitors in series into a textile, which was able http://dx.doi.org/10.1016/j.nanoen.2015.05.004 2211-2855/& 2015 Elsevier Ltd. All rights reserved. n Corresponding authors. E-mail addresses: zhumf@dhu.edu.cn (M. Zhu), cheng@imr.ac.cn (H.-M. Cheng). Nano Energy (2015) 15, 642–653