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Vol. 13 (2021)

Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors

https://doi.org/10.1007/s40820-020-00529-8
Xiaona Wang
Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, Joint Key Laboratory of Functional Nanomaterials and Devices, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano‑Tech and Nano‑Bionics, Chinese Academy of Sciences, Suzhou 215123, People’s Republic of China
Zhenyu Zhou
Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, Joint Key Laboratory of Functional Nanomaterials and Devices, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano‑Tech and Nano‑Bionics, Chinese Academy of Sciences, Suzhou 215123, People’s Republic of China
Zhijian Sun
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Jinho Hah
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Yagang Yao
Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, Joint Key Laboratory of Functional Nanomaterials and Devices, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano‑Tech and Nano‑Bionics, Chinese Academy of Sciences, Suzhou 215123, People’s Republic of China
Kyoung‑Sik Moon
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Jiangtao Di
Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, Joint Key Laboratory of Functional Nanomaterials and Devices, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano‑Tech and Nano‑Bionics, Chinese Academy of Sciences, Suzhou 215123, People’s Republic of China
Qingwen Li
Division of Advanced Nanomaterials, Key Laboratory of Nanodevices and Applications, Joint Key Laboratory of Functional Nanomaterials and Devices, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano‑Tech and Nano‑Bionics, Chinese Academy of Sciences, Suzhou 215123, People’s Republic of China
Ching‑ping Wong
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Corresponding Author: Ching‑ping Wong

cp.wong@mse.gatech.edu

Nano-Micro Letters, Vol. 13 (2021), Article Number: 4

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.


Highlights:


1 3D Zn-doped CuO framework was designed for aligned distributing high mass loading of MnO2 nanosheets.
2 Zn could be introduced into the CuO crystal lattice to tune the covalency character and thus improve charge transport.
3 A free-standing asymmetric coaxial fiber-shaped supercapacitor based on Zn–CuO@MnO2 core electrode possesses superior performance including higher capacity and better stability under deformation.

Keywords

Coaxial fiber-shaped supercapacitors 3D framework Zn–CuO nanowires Zn–CuO@MnO2 core–shell structure
Wang, Xiaona, Zhenyu Zhou, Zhijian Sun, Jinho Hah, Yagang Yao, Kyoung‑Sik Moon, Jiangtao Di, Qingwen Li, and Ching‑ping Wong. 2020. “Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber-Shaped Supercapacitors”. Nano-Micro Letters 13 (October):4. https://doi.org/10.1007/s40820-020-00529-8.
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