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Highly mesoporous structure nickel cobalt oxides with an ultra-high specific surface area for supercapacitor electrode materials

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Abstract

Highly mesoporous structure nickel cobalt oxides with an ultra-high specific surface area are synthesized through a sol–gel method by using silica derived from tetraethoxysilane hydrolysis as a template. The structural and morphological characteristics of the oxides are determined using X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and N2 adsorption experiments. The electrochemical properties, including capacitance, of the oxides are analyzed through cyclic voltammetry, AC impedance spectroscopy, and charge–discharge tests in 7 M KOH under ambient conditions. The as-prepared nickel cobalt oxides possessing an ultra-high specific surface area of 438.3 m2 g−1 and a mesoporous structure exhibit a high specific capacitance of 1157.7 F g−1 and a long-term cyclic stability (97.13 % capacity retention after 5000 cycles). Thus, the prepared oxides are promising for supercapacitor applications.

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Acknowledgments

We gratefully acknowledge the funding support by Laboratory of Precision Manufacturing Technology, CAEP (Grant No. KF15003).

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Authors and Affiliations

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China

    Ni Wang, Mengqi Yao, Peng Zhao, Qian Zhang & Wencheng Hu

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  1. Ni Wang
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  2. Mengqi Yao
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  3. Peng Zhao
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  4. Qian Zhang
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  5. Wencheng Hu
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Correspondence to Wencheng Hu.

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Wang, N., Yao, M., Zhao, P. et al. Highly mesoporous structure nickel cobalt oxides with an ultra-high specific surface area for supercapacitor electrode materials. J Solid State Electrochem 20, 1429–1434 (2016). https://doi.org/10.1007/s10008-016-3149-z

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  • DOI: https://doi.org/10.1007/s10008-016-3149-z

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