科学研究

反应温度对水热合成法制备MnO2的晶型、形貌及超级电容性能的影响研究

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  • 1.西南交通大学材料科学与工程学院,成都610031;
    2.材料先进技术教育部重点实验室,成都610031
周玉(1995-),女,硕士研究生,主要研究方向为功能材料。

收稿日期: 2019-02-21

  网络出版日期: 2022-11-01

基金资助

高技术有机纤维四川省重点实验室开放基金(PLN 2016-09)

Influence of reaction temperature to crystal structure,morphology and supercapacitance performance of MnO2 prepared by hydrothermal synthesis

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  • 1. School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031;
    2. Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Chengdu 610031

Received date: 2019-02-21

  Online published: 2022-11-01

摘要

以硫酸锰为锰源、过硫酸铵为氧化剂,分别在100℃、120℃、140℃、160℃和180℃的反应温度下,通过水热合成法制备了5个MnO2产物。XRD、SEM及超级电容性能测试结果表明,反应温度直接影响MnO2产物的晶型、形貌与超级电容性能。当反应温度在100~120℃范围内时,制得的MnO2产物(S1和S2)呈球状聚集体形貌,晶型结构为α+γ;当反应温度在140~180℃范围内时,制得了呈棒状形貌的α+β型MnO2产物(S3、S4和S5),且产物平均直径随反应温度的升高而逐渐增大(0.18~0.51μm),α晶型含量随反应温度的升高而逐渐降低(77.8%~57.5%)。棒状形貌产物(S3、S4和S5)较具有球状聚集体形貌的产物(S1和S2)表现出更高的比电容值、库伦效率和比电容保持率;在棒状形貌产物中,棒状体直径最小、α晶型含量最高的S3产物表现出最优的超级电容性能。

本文引用格式

周玉, 李凯楠, 胡书春, 张鲲, 屈圆圆, 李晓冬, 周文杰 . 反应温度对水热合成法制备MnO2的晶型、形貌及超级电容性能的影响研究[J]. 化工新型材料, 2020 , 48(7) : 175 -180 . DOI: 10.19817/j.cnki.issn 1006-3536.2020.07.040

Abstract

With using manganese sulfate monohydrate as manganese source and ammonium persulfate as oxidant,five MnO2 products were prepared by a hydrothermal synthesis method at the reaction temperature of 100,120,140,160 and 180℃,respectively.The results of XRD,SEM and supercapacitor performance tests shown that the reaction temperature directly affected the crystal form,morphology and supercapacitor properties of MnO2 products.When the reaction temperature was in the range of 100~120℃,the as-prepared MnO2 (S1 and S2) were consisted of α+γ crystal and in the morphology of aggregated spheres.As the temperature was in the range of 140~180℃,MnO2 products (S3~S5) with the crystal form of α+β and the morphology of rods were synthesized;furthermore,with the increasing of reaction temperature from 140 to 180℃,the rod diameter was found to be gradually increased from 0.18 to 0.51 μm,as well as the α-form content was proved to be gradually decreased from 77.8% to 57.5%.As far as supercapacitor properties are concerned,the rod-like products (S3-S5) exhibits higher specific capacitance,coulombic efficiency and capacitance retention than those aggregated sphere-like products (S1 and S2).Among the rod-like products,product S3 which with the smallest rod diameter and the highest α-form content appeared the best supercapacitor behavior.   

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