Preparation and Electrochemical Properties of Al3+-Doped δ -MnO2

doi:10.7503/cjcu20220658

Abstract

Abstract:

Al³⁺-doped δ-MnO₂ nano-powders with different doping ratios were synthesized by hydrothermal method. The influence of Al³⁺-doping on the δ-MnO₂ crystal structure and electrochemical performance was characterized by X-ray diffraction， scanning electron microscopy， transmission electron microscopy， X-ray photoelectron spectro- scopy， cyclic voltammetry， electrochemical impedance spectroscopy and galvanostatic charge-discharge. The results suggested that Al³⁺ ions entered into the crystal lattice of δ-MnO₂ to replace some Mn³⁺ and Mn⁴⁺ ions， which enhanced the electrical conductivity and structural stability of δ-MnO₂， and thus significantly improved the electrochemical performance. When the molar ratio of Al³⁺/Mn²⁺ in the precursor was 0.45， the synthesized product （A0.45M） showed the best electrochemical performance. A0.45M delivered a specific capacitance of 207.61 F/g at a current density of 1 A/g， which was 2.4 times the capacitance of the pure δ-MnO₂（A0M）. Moreover， A0.45M could maintain a high specific capacitance of 100.81 F/g even after 10000 cycles at 10 A/g， with capacity retention ratio of 81.33%.

Key words: δ-MnO₂, Supercapacitor, Al³⁺-Doped, Hydrothermal method

CLC Number:

O646

TrendMD:

XIA Ao, ZENG Xiaoxiong, LI Jiameng, CHEN Jun, TAN Guoqiang. Preparation and Electrochemical Properties of Al³⁺-Doped δ -MnO₂[J]. Chem. J. Chinese Universities, 2023, 44(4): 20220658.

Figures/Tables 12

References 27

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Sample	Atom ratio
Sample	Mn³⁺/Mn⁴⁺	O₁/O₂
A0M	0.4887	6.495
A0.45M	0.3285	6.118
A0.5M	0.2497	6.287

Sample	Atom ratio
Sample	Mn³⁺/Mn⁴⁺	O₁/O₂
A0M	0.4887	6.495
A0.45M	0.3285	6.118
A0.5M	0.2497	6.287

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Preparation and Electrochemical Properties of Al³⁺-Doped δ -MnO₂

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