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Enhanced micro-supercapacitors in aqueous electrolyte based on Si nanowires coated with TiO2

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Abstract

Silicon nanowire (SiNW) is a promising material for micro-supercapacitors (μ-SCs). However, the practical application of SiNW μ-SCs is hindered due to the instability of Si in aqueous solutions. Here, we demonstrate that the overall capacitive properties of SiNW μ-SCs can be improved by a facile TiO2 coating treatment. In this study, SiNWs were fabricated by metal-assisted chemical etching and TiO2 was spin-coated on SiNWs. With the optimal processing condition, the TiO2-coated SiNWs (T-SiNWs) exhibit an areal capacitance of 2.69 mF cm−2 at the scan rate of 50 mV s−1 and 3.55 mF cm−2 at the current density of 0.1 mA cm−2, respectively. Further, an enhanced rate capability of T-SiNWs is observed owing to the TiO2 coating. Moreover, a retention of 68.8% is obtained by T-SiNWs after 1000 galvanostatic charge–discharge cycles, which is higher than that of the bare SiNWs. The reasons for the capacitive property enhancement of the electrode materials were also investigated.

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Acknowledgement

The authors thank Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology (ASMA201602), Open Fund of Key Laboratory of Materials Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology No. 56XCA17006-1 for financial support.

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Authors and Affiliations

  1. Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, China

    Cheng Zhang, Shuang Tian, Jian Zhou & Feng Xue

  2. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA

    Cheng Zhang, Liyi Li & Ching-Ping Wong

  3. Industry and Information Technology Key Laboratory of Materials Processing and Protection Technology for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing, China

    Jian Zhou & Feng Xue

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  1. Cheng Zhang
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  2. Shuang Tian
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  3. Liyi Li
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  4. Jian Zhou
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  6. Ching-Ping Wong
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Correspondence to Jian Zhou or Ching-Ping Wong.

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Zhang, C., Tian, S., Li, L. et al. Enhanced micro-supercapacitors in aqueous electrolyte based on Si nanowires coated with TiO2. J Mater Sci: Mater Electron 30, 8763–8770 (2019). https://doi.org/10.1007/s10854-019-01200-8

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  • DOI: https://doi.org/10.1007/s10854-019-01200-8

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