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<p>Manganese dioxide is an environmentally friendly, low-cost zinc-based energy storage electrode material. However, its practical application is easily hindered by slow diffusion kinetics and low specific capacity. During the preparation of manganese dioxide by hydrothermal method, we observed that the hydrothermal time had a significant effect on the zinc-ion transport channels in MnO<sub>2</sub>, which was manifested as a shift from 1 × 1 tunnel structure (MnO<sub>2</sub>-24h, hydrothermal for 24h) to 2 × 2 tunnel structure (MnO<sub>2</sub>-8h, hydrothermal for 8h). MnO<sub>2</sub>-8h sample achieves a faster Zn<sup>2+</sup> migration rate due to the widening of ion channels and the microporous structure formed by the aggregation of nanowire morphology. At the same time, the sample demonstrated excellent specific capacity and stability. At a current density of 0.2 A g<sup>−1</sup>, the specific capacity is as high as 256.9&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup>, which is much higher than that of the MnO<sub>2</sub>-24h sample. It also has excellent durability of 71.7% after 1000 cycles at 1 A g<sup>−1</sup>. In addition, the dynamic behavior shows that capacitive control is dominant, with the pseudo-capacitance of the MnO<sub>2</sub>-8h sample contributing up to 79% at 0.4 mV&#xa0;s<sup>−1</sup>.</p>

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Effect of hydrothermal time on Zn2+ transport channel in manganese dioxide

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Yao Xu,
  • Zu-Tao Pan,
  • Zhi-Cai Wang,
  • Jing-Feng Hou,
  • Ling-Bin Kong

摘要

Manganese dioxide is an environmentally friendly, low-cost zinc-based energy storage electrode material. However, its practical application is easily hindered by slow diffusion kinetics and low specific capacity. During the preparation of manganese dioxide by hydrothermal method, we observed that the hydrothermal time had a significant effect on the zinc-ion transport channels in MnO2, which was manifested as a shift from 1 × 1 tunnel structure (MnO2-24h, hydrothermal for 24h) to 2 × 2 tunnel structure (MnO2-8h, hydrothermal for 8h). MnO2-8h sample achieves a faster Zn2+ migration rate due to the widening of ion channels and the microporous structure formed by the aggregation of nanowire morphology. At the same time, the sample demonstrated excellent specific capacity and stability. At a current density of 0.2 A g−1, the specific capacity is as high as 256.9 mA h g−1, which is much higher than that of the MnO2-24h sample. It also has excellent durability of 71.7% after 1000 cycles at 1 A g−1. In addition, the dynamic behavior shows that capacitive control is dominant, with the pseudo-capacitance of the MnO2-8h sample contributing up to 79% at 0.4 mV s−1.