Introduction of MnO2 nanoneedles to activated carbon to fabricate high-performance electrodes as electrochemical supercapacitors
Introduction of MnO2 nanoneedles to activated carbon to fabricate high-performance electrodes as electrochemical supercapacitors
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DOI：
10.1016/j.electacta.2013.09.058
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发表时间：
2013-12
影响因子：
6.6
通讯作者：
Myeongjin Kim;Yongseon Hwang;Kyung-Joon Min;Jooheon Kim
中科院分区：
文献类型：
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作者：
Myeongjin Kim;Yongseon Hwang;Kyung-Joon Min;Jooheon Kim
报道了通过以下合成步骤合成用作超级电容器中的高性能材料的活性炭/MnO 2复合材料：首先，对活性炭进行热处理以产生含氧官能团，从而在活性炭和MnO 2纳米针之间提供锚位点。随后在活性炭表面上实现了MnO 2纳米针的形成。表征表明，复合材料中的MnO 2纳米针均匀分散在热处理后的活性炭表面。在制备活性炭/MnO 2复合材料之前，测定了活性炭的氧化程度。由经过6小时热处理（AC 6）的活性炭制成的电极显示出最高的比电容（90.5 F g-1），这归因于由氧官能团引起的快速氧化还原过程。当MnO 2/AC 6投料比为3：1时（AC 6/MnO 2（3）），AC 6/MnO 2复合电极的比电容值最高，这是活性炭多孔结构和MnO 2纳米针氧化还原反应的协同作用的结果。该过程是一种有前途的超级电容器电极的制造方法。
Synthesis of activated carbon/MnO2composites for use as high-performance materials in supercapacitors is reported by the following synthetic procedure: first, activated carbon was thermally treated to create oxygen-containing functional groups in order to provide anchor sites between the activated carbon and MnO2nanoneedles. Formation of MnO2nanoneedles was subsequently achieved on the activated carbon surface. Characterizations indicated that the MnO2nanoneedles in the composite were homogeneously dispersed on the thermally treated activated carbon surface. Before fabricating activated carbon/MnO2composites, the extent of the oxidation of the activated carbon was determined. The electrode made from the activated carbon subjected to 6 h of thermal treatment (AC6) showed the highest specific capacitance (90.5 F g−1), which was attributed to the fast redox process caused by the oxygen functional groups. The specific capacitance of the AC6/MnO2composite formed with a MnO2/AC6 feeding ratio of 3:1 (AC6/MnO2(3)) showed the highest value among the AC6/MnO2composite electrodes fabricated, which was attributed to the synergistic effect of both the activated carbon porous structure and redox reaction of the MnO2nanoneedles. This procedure is a promising fabrication method for supercapacitor electrodes.