题目：

Constructing Ultrahigh-Capacity Zinc−Nickel−Cobalt Oxide@Ni(OH)₂ Core−Shell Nanowire Arrays for High-Performance Coaxial Fiber-Shaped Asymmetric Supercapacitors

作者：

Qichong Zhang,^#,1,3 Weiwei Xu,^#,2 Juan Sun,^#,1,4 Zhenghui Pan,¹ Jingxin Zhao,¹ Xiaona Wang,¹ Jun Zhang,¹ Ping Man,¹ Jiabin Guo,¹ Zhenyu Zhou,¹ Bing He,¹ Zengxing Zhang,³ Qingwen Li,¹ Yuegang Zhang,¹ Lai Xu,*^,2 and Yagang Yao^*,1

单位：

¹Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Suzhou 215123, P. R. China

²Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, PR China

³Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, P. R. China

⁴School of Physical Science and Technology, Shanghai Tech University, Shanghai 200120, PR China

摘要：

Increased efforts have recently been devoted to developing high-energy-density flexible supercapacitors for their practical application in portable and wearable electronics. Although high operating voltages have been achieved in fiber-shaped asymmetric supercapacitors (FASCs), low specific capacitance still restricts further enhancement of their energy density. This article specifies a facile and cost-effective method to directly grow three-dimensionally well-aligned zinc-nickel-cobalt oxide (ZNCO)@Ni(OH)₂ nanowire arrays (NWAs) on carbon nanotube fiber (CNTF) with ultrahigh specific capacitance of 2847.5 F/cm³ (10.678 F/cm²) at a current density of 1 mA/cm², which is approximately five times higher than that of ZNCO NWAs/CNTF electrode (2.10 F/cm²) and four times of Ni(OH)₂/CNTF electrode (2.55 F/cm²). Benefiting from their unique features, we successfully fabricated a prototype coaxial FASC (CFASC) with a maximum operating voltage of 1.6 V, which was assembled by adopting ZNCO@Ni(OH)₂ NWAs/CNTF as the core electrode and thin carbon layer coated vanadium nitride (VN@C) NWAs on carbon nanotube strip (CNTS) as the outer electrode with KOH poly(vinyl alcohol) (PVA) as the gel electrolyte. A high specific capacitance of 94.67 F/cm³ (573.75 mF/cm²) and an exceptional energy density of 33.66 mWh/cm³ (204.02 μWh/cm²) were achieved for our CFASC device, which represent the highest level of fiber-shaped supercapacitors to date. More importantly, the fiber-shaped ZnO-based photodetector is powered by the integrated CFASC and it demonstrates excellent sensitivity of detecting UV light. Thus, this work paves the way to construct ultrahigh˗capacity electrode materials for next-generation wearable energy-storage devices.

影响因子：

12.712

分区情况：

一区

链接：

http://pubs.acs.org/doi/10.1021/acs.nanolett.7b03507