纳微快报（英文）2021，Vol.13Issue(1)：44-55,12.
Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors
Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber?Shaped Supercapacitors
摘要
Abstract
Coaxial fiber-shaped supercapacitors are a promising class of energy storage devices requiring high performance for flexible and miniature electronic devices. Yet, they are still struggling from inferior energy density, which comes from the limited choices in materials and structure used. Here, Zn-doped CuO nanowires were designed as 3D framework for aligned distributing high mass loading of MnO2 nanosheets. Zn could be introduced into the CuO crystal lattice to tune the covalency character and thus improve charge transport. The Zn-CuO@ MnO2 as positive electrode obtained superior performance without sacrificing its areal and gravimetric capacitances with the increasing of mass loading of MnO2 due to 3D Zn-CuO framework enabling efficient electron transport. A novel category of free-standing asymmetric coaxial fiber-shaped supercapacitor based on Zn0.11CuO@ MnO2 core electrode possesses superior specific capacitance and enhanced cell potential window. This asymmetric coaxial structure provides superior performance including higher capacity and better stability under deformation because of sufficient contact between the electrodes and electrolyte. Based on these advantages, the as-prepared asymmetric coaxial fiber-shaped supercapacitor exhibits a high specific capacitance of 296.6 mF cm- 2 and energy density of 133.47 μWh cm- 2. In addition, its capacitance retention reaches 76.57％ after bending 10,000 times, which demonstrates as-prepared device's excellent flexibility and long-term cycling stability.关键词
Coaxial fiber-shaped supercapacitors/3D framework/Zn-CuO nanowires/Zn-CuO@MnO2 core-shell structureKey words
Coaxial fiber-shaped supercapacitors/3D framework/Zn-CuO nanowires/Zn-CuO@MnO2 core-shell structure引用本文复制引用
Xiaona Wang,Zhenyu Zhou,Zhijian Sun,Jinho Hah,Yagang Yao,Kyoung‑Sik Moon,Jiangtao Di,Qingwen Li,Ching‑ping Wong..Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors[J].纳微快报（英文）,2021,13(1):44-55,12.基金项目
The authors thank financial supports from the National Natural Science Foundation of China(Nos.21975281,21773293,21603264),CAS Pioneer Hundred Talents Program,the National Key Research and Development Program of China(2016YFA0203301),Jiangsu Planned Projects for Postdoctoral Research Funds(2019K048),and Suzhou Science and Technology Plan Project(SYG201926). （Nos.21975281,21773293,21603264）
