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Research Article

Boosting Zn-ion storage capability of self-standing Zn-doped Co3O4 nanowire array as advanced cathodes for high-performance wearable aqueous rechargeable Co//Zn batteries

Qiulong Li1,2,5,§, Qichong Zhang3,§, Zhengyu Zhou3,4,§, Wenbin Gong3, Chenglong Liu3,4, Yongbao Feng1, Guo Hong6,7, Yagang Yao2,3,4( )
College of Materials Science and Engineering, Nanjing Tech University, 30 Puzhu Road, Nanjing 211816, China
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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 Nanotech and Nanobionics, Chinese Academy of Sciences, Suzhou 215123, China
Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Nanchang, Chinese Academy of Sciences, Nanchang 330200, China
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
Institute of Applied Physics and Materials Engineering, University of Macau. Avenida da Universidade, Taipa, Macau SAR 999078, China
Department of Physics and Chemistry, Faculty of Science and Technology, University of Macau, Avenida da Universidade, Taipa, Macau SAR 999078, China

§ Qiulong Li, Qichong Zhang, and Zhengyu Zhou contributed equally to this work.

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Abstract

Neutral aqueous rechargeable Co3O4//Zn batteries with high-output voltage and outstanding cycling stability have yielded new insights into wearable energy-storage devices. To meet the increasing demand for a means of powering wearable and portable devices, the development of a high-performance fiber-shaped Co//Zn battery would be highly desirable. However, the intrinsically poor conductivity of Co3O4 significantly restricts the application of these high-capacity and high-rate aqueous rechargeable battery. Encouragingly, density functional theory (DFT) calculations demonstrate that the substitution of Zn for Co3+ leads to an insulator-metal transition in the Zn-doped Co3O4 (Zn-Co3O4). In this study, we used metallic Zn-Co3O4 nanowire arrays (NWAs) as a novel binder-free cathode to successfully fabricate an all-solid-state fiber-shaped aqueous rechargeable (AFAR) Co//Zn battery. The resulting fiber-shaped Co//Zn battery takes advantage of the enhanced conductivity, increased capacity, and improved rate capability of Zn-Co3O4 NWAs to yield a remarkable capacity of 1.25 mAh·cm-2 at a current density of 0.5 mA·cm-2, extraordinary rate capability (60.8% capacity retention at a high current density of 20 mA·cm-2) and an admirable energy density of 772.6 mWh·cm-3. Thus, the successful construction of Zn-Co3O4 NWAs provides valuable insights into the design of high-capacity and high-rate cathode materials for aqueous rechargeable high-voltage batteries.

Keywords

Zn-doped Co3O4aqueous rechargeable Co//Zn batteryfiber-shapedhigh-capacityhigh-rate

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Nano Research
Volume 14 Issue 1,
January 2021
Pages 91-99
DOI: 10.1007/s12274-020-3046-8
Cite this article:
Li Q, Zhang Q, Zhou Z, et al. Boosting Zn-ion storage capability of self-standing Zn-doped Co3O4 nanowire array as advanced cathodes for high-performance wearable aqueous rechargeable Co//Zn batteries. Nano Research, 2021, 14(1): 91-99. https://doi.org/10.1007/s12274-020-3046-8
Topics:
Nano unitCathodesDensity functional theoryElectric energy storageNanowiresState BatteriesWearable technologyZinc compounds

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Received: 24 July 2020
Revised: 24 July 2020
Accepted: 10 August 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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