Mn 7C 3@C核壳型纳米粒子制备及其超级电容器电极特性

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Ramon Alberto Paredes Camacho,冯晨辰,吴爱民,黄昊.Mn 7C 3@C核壳型纳米粒子制备及其超级电容器电极特性[J].,2016,56(6):567-574

Mn 7C 3@C核壳型纳米粒子制备及其超级电容器电极特性

Synthesis of core-shell Mn 7C 3@C nanoparticles and their electrode characteristics for supercapacitors

DOI：10.7511/dllgxb201606003

中文关键词:直流电弧等离子体 Mn 7C 3@C 高比电容循环稳定性

英文关键词:DC arc-discharge plasma Mn 7C 3@C high specific capacitance cycle stability

基金项目:中央高校基本科研业务费专项资金资助项目(DUT15LAB05)；常州市企业领军型创新人才引进培育计划资助项目(CQ20153002)；国家自然科学基金资助项目(51171033).

作者	单位
Ramon Alberto Paredes Camacho,冯晨辰,吴爱民,黄昊

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中文摘要:

以甲烷作为碳源气体，块体锰作为原料，采用一种简单的直流电弧等离子体法成功制备了Mn 7C 3@C核壳型纳米粒子，用于高性能超级电容器的电极材料．所制备的Mn 7C 3@C核壳型纳米粒子平均直径为30~35 nm．拉曼光谱结果显示石墨碳壳具有良好的导电性．通过循环伏安、恒电流充放电及电化学交流阻抗谱对Mn 7C 3@C核壳型纳米粒子电极材料进行电化学性能分析，结果表明其具有高比电容、快速充放电等优异的电化学性能．在扫描速率为1 mV/s时，比电容最高可达185.8 F/g．同时具有良好的循环稳定性，在100 mV/s扫描速率下1 000次循环伏安测试后，比电容仍保持为最初的88%，与单纯Mn 7C 3(79%)相比，有明显提高．Mn 7C 3@C核壳型纳米粒子电极材料优异的电化学性能归因于其良好的核壳结构，富缺陷碳层具有良好的导电性，有助于离子的传输和结构的稳定，而内核Mn 7C 3主要产生赝电容，在C和Mn 7C 3的协同作用下产生双电层和赝电容双模式储能机制．

英文摘要:

Core-shell Mn 7C 3@C nanoparticles are synthesized successfully by a facile DC arc-discharge plasma method with CH 4 as carbon source and block metal Mn as manganese material, which are used as electrode materials for high-performance supercapacitors. The as-prepared Mn 7C 3@C mainly composes of spherical nanoparticles with a mean size of about 30-35 nm. Raman spectra provide enough evidence of high electrical conductivity of the graphitic carbon layers. The electrochemical performance of core-shell Mn 7C 3@C nanoparticles electrode material is tested by cyclic voltammograms, galvanostatic charge-discharge and electrochemical impedance spectroscopy, which shows an excellent electrochemical performance, such as high specific capacitance, rapid charge-discharge and so on. The specific capacitance reaches 185.8 F/g at the scan rate of 1 mV/s. Meanwhile, good cycle stability is obtained, where 88% of the initial specific capacitance is retained after 1 000 cycles at the scan rate of 100 mV/s, significantly improving the Mn 7C 3 nanoparticles performance (79%). The excellent electrochemical response is attributed to a well-defined core-shell structure, where a super-conductive, defect-enriched carbon layer that fastens the ion exchange and provides stability for the structure and the pseudocapacitive contribution from Mn 7C 3 core, which generates an optimal dual energy storage mechanism of double-layer capacitance and pseudocapacitance.

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