微波水热合成氧化锰纳米晶及其形貌与物相关联的电化学性能研究
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- 英文论文题名：Morphology and phase dependent electrochemical performance of manganese oxide nanostructures derived by a microwave-assisted solvothermal process
- 论文作者：陈德良 ; 葛连方 ; 杨晶 ; 王志强 ; 邵刚 ; 范冰冰 ; 王海龙 ; 许红亮 ; 卢红霞 ; 张锐
- 英文论文作者：Deliang Chen ; Lianfang Ge ; Jing Yang ; Zhiqiang Wang ; Gang Shao ; Bingbing Fan ; Hongliang Xu ; Hongxia Lu ; Rui Zhang ; School of Materials Science and Engineering ; Zhengzhou University ; Department of Energy and Chemical Engineering ; Dongguan University of Technology
- 年：2016
- 作者机构：郑州大学材料科学与工程学院;东莞理工学院能源与化工系;
- 论文关键词：氧化锰纳米晶 ; 电极活性材料 ; 微波辅助溶剂热合成 ; 电化学性能 ; 电化学阻抗谱
- 英文论文关键词：Manganese oxide nanocrystals ; electroactive materials ; microwave-assisted solvothermal synthesis ; electrochemical property ; electrochemical impedance spectroscopy
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十二分会：能源纳米材料物理化学
- 语种：中文
- 分类号：TQ137.12;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十二分会 ; 能源纳米材料物理化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：210k
- 原文格式：D
- 会议级别：全国
摘要
氧化锰(MnO_x)形貌和物相严重影响它们作为电极材料的电化学活性。本文用高锰酸钾作为Mn源,在60-160℃下微波辅助溶剂热处理30分钟,制备了形貌可控的MnO_x纳米晶。采用XRD、SEM和电化学分析等方法对所得到样品进行了系统表征。结果表明:在60-130℃得到的样品为δ-MnO_2物相,而在160℃得到的样品则主要由四方相Mn_3O_4组成。氧化锰纳米晶的形貌受溶剂热温度高的影响很大;氧化锰纳米晶的晶粒大小从60℃下13纳米增大到160℃下的87纳米。在60℃下所得的MnO_2样品的比容量可达293 F/g,高于其他条件下所得氧化锰纳米晶的比容量(100℃时206 F/g、130℃时183 F/g、160℃时47 F/g)。氧化锰纳米晶提高的比容量应主要因为更小的颗粒尺寸和更低的等效串联电阻所致。
The morphology and phase of manganese oxide(MnO_x) highly influence their electrochemistry. This paper reported the controlled synthesis of MnO_x nanostructures by a microwave-assisted solvothermal process at 60-160℃ for 30 min, using KMn O4 as the Mn source. The as-obtained samples were characterized by XRD, SEM, and electrochemical analysis. The samples obtained at 60-130℃ consist of a δ-MnO_2 phase, whereas the sample obtained at 160℃ consists of a tetragonal Mn_3O_4 phase. Their morphologies are highly influenced by the solvothermal temperature, and the particle size increases from ~13 nm to ~87 nm as the temperature increases from 60 to 130℃. The MnO_2 sample obtained at 60℃ has a higher specific capacitance(293 F/g) than the other samples(206 F/g at 100℃, 183 F/g at 130℃, and 47 F/g at 160℃), because of the smaller sizes and lower equivalent series resistance.
The morphology and phase of manganese oxide(MnO_x) highly influence their electrochemistry. This paper reported the controlled synthesis of MnO_x nanostructures by a microwave-assisted solvothermal process at 60-160℃ for 30 min, using KMn O4 as the Mn source. The as-obtained samples were characterized by XRD, SEM, and electrochemical analysis. The samples obtained at 60-130℃ consist of a δ-MnO_2 phase, whereas the sample obtained at 160℃ consists of a tetragonal Mn_3O_4 phase. Their morphologies are highly influenced by the solvothermal temperature, and the particle size increases from ~13 nm to ~87 nm as the temperature increases from 60 to 130℃. The MnO_2 sample obtained at 60℃ has a higher specific capacitance(293 F/g) than the other samples(206 F/g at 100℃, 183 F/g at 130℃, and 47 F/g at 160℃), because of the smaller sizes and lower equivalent series resistance.
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