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<p>In this work, to improve the performance of P-doped MnO<sub>2</sub> (designated PMO) electrodes as a supercapacitor, TiO<sub>2</sub> was deposited on a PMO (designated PMO@TiO<sub>2</sub>) electrode and annealed at various temperatures. Through this surface engineering, using atomic layer deposition (ALD), an ultrathin film of 5&#xa0;nm TiO<sub>2</sub> deposited over the PMO electrode acts as an active layer that enhances both the electrochemical performance and the stability of the core electrode. In addition, the thermal treatment of TiO<sub>2</sub> deposited on a PMO electrode enhanced the crystallinity of TiO<sub>2</sub> with anatase phase and improved its electrical conductivity and cyclic stability. These results lead to such a significant improvement in the specific capacitance from 1828 to 2817 F/g with a decrease in charge transfer resistance (R<sub>ct</sub>) and an increase in active sites at the PMO@TiO<sub>2</sub> electrode annealed at 500 ℃ (designated PMO@TiO<sub>2</sub>(500)) compared to the PMO electrode from GCD profiles and coulombic efficiency. Moreover, cyclic stability of the PMO@TiO<sub>2</sub>(500) electrode improved capacity retention from 69.8 to 86.4% at 3000 cycles. Therefore, it is suitable for a positive electrode, which has high capacitance, low R<sub>ct</sub>, low cost, and high-water decomposition overvoltage for supercapacitor.</p>

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Thermally Enhanced Supercapacitive Performance of ALD-Grown TiO2 Thin Film on Phosphorus-Doped MnO2 as a Positive Electrode

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Yeonhong Kim,
  • Amarnath. T. Sivagurunathan,
  • Gi-Hyeok Noh,
  • Ganghyun Jang,
  • Do-Heyoung Kim

摘要

In this work, to improve the performance of P-doped MnO2 (designated PMO) electrodes as a supercapacitor, TiO2 was deposited on a PMO (designated PMO@TiO2) electrode and annealed at various temperatures. Through this surface engineering, using atomic layer deposition (ALD), an ultrathin film of 5 nm TiO2 deposited over the PMO electrode acts as an active layer that enhances both the electrochemical performance and the stability of the core electrode. In addition, the thermal treatment of TiO2 deposited on a PMO electrode enhanced the crystallinity of TiO2 with anatase phase and improved its electrical conductivity and cyclic stability. These results lead to such a significant improvement in the specific capacitance from 1828 to 2817 F/g with a decrease in charge transfer resistance (Rct) and an increase in active sites at the PMO@TiO2 electrode annealed at 500 ℃ (designated PMO@TiO2(500)) compared to the PMO electrode from GCD profiles and coulombic efficiency. Moreover, cyclic stability of the PMO@TiO2(500) electrode improved capacity retention from 69.8 to 86.4% at 3000 cycles. Therefore, it is suitable for a positive electrode, which has high capacitance, low Rct, low cost, and high-water decomposition overvoltage for supercapacitor.