纳米氧化锰的电沉积及其在超级电容器中的电化学性能研究

Electrodeposition of Nanostructured Manganese Oxide Material and Its Electrochemical Performances in Supercapacitors

摘要: 超级电容器是一种新型电化学储能器件，具有充放电速度快、使用寿命长及安全环保等特点，可广泛应用于民用、军事及航空航天等领域。电极材料是影响超级电容器性能的重要指标。氧化锰电极材料具有理论容量大、电位窗口宽及储量丰富等优势，但其自身电导率较低，实际电化学性能表现仍需进一步提高。本文利用恒电流沉积技术在碳布基底上电沉积氧化锰电极材料，研究了制备液中Mn²⁺浓度对氧化锰电化学性能的影响。结果表明，当制备液中Mn²⁺浓度为0.15 mol/L时，沉积时间为10 min时，所制备的氧化锰具有多孔状的纳米纤维形貌，在1 mA/cm²电流密度下的面积比电容高达841.0 mF/cm²，在50 mA/cm²下的比电容维持率高达53.91%。

Abstract: Supercapacitors are a novel type of electrochemical energy storage device characterized by rapid charging and discharging, long service life, safety, and environmental friendliness. They can be broadly applied in civil, military, aerospace, and other fields. Electrode material is a crucial factor influencing the performance of supercapacitors. Manganese oxide electrode materials offer advantages such as high theoretical capacitance, wide potential window, and abundant reserves. However, their low intrinsic conductivity necessitates further enhancement of their actual electrochemical performance. In this paper, manganese oxide electrode materials were electrodeposited onto a carbon cloth substrate using galvanostatic deposition technology. The influence of Mn²⁺ concentration in the preparation solution on the electrochemical performance of manganese oxide was investigated. The results indicated that when the Mn²⁺ concentration in the preparation solution was 0.15 mol/L and the deposition time was 10 minutes, the prepared manganese oxide exhibited a porous nanofiber morphology. It achieved a high areal capacitance of 841.0 mF/cm² at a current density of 1 mA/cm² and maintained a high capacitance retention rate of 53.91% at 50 mA/cm².