School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea.
Department of Environmental Engineering, Inha University, 100 Inharo, Nam-gu, Incheon, 22212, Republic of Korea.
J Environ Manage. 2017 Dec 1;203(Pt 3):880-887. doi: 10.1016/j.jenvman.2017.05.008. Epub 2017 May 9.
Developing supercapacitor electrodes at an affordable cost while improving their energy and/or power density values is still a challenging task. This study introduced a recipe which assembled a novel electrode composite using a liquid phase plasma that was applied to a reactant solution containing an activated carbon (AC) powder with dual metal precursors of iron and manganese. A comparison was made between the composites doped with single and dual metal components as well as among those synthesized under different precursor concentrations and plasma durations. The results showed that increasing the precursor concentration and plasma duration raised the content of both metal oxides in the composites, whereas the deposition conditions were more favorable to iron oxide than manganese oxide, due to its higher standard potential. The composite treated with the longest plasma duration and highest manganese concentration was superior to the others in terms of cyclic stability and equivalent series resistance. In addition, the new composite selected out of them showed better electrochemical performance than the raw AC material only and even two types of single metal-based composites, owing largely to the synergistic effect of the two metal oxides. Therefore, the proposed methodology can be used to modify existing and future composite electrodes to improve their performance with relatively cheap host and guest materials.
以可负担的成本开发具有高能量和/或功率密度的超级电容器电极仍然是一项具有挑战性的任务。本研究提出了一种使用液相等离子体组装新型电极复合材料的方案，该方案应用于含有活性炭（AC）粉末和双金属铁和锰前体的反应溶液中。对掺杂单金属和双金属成分的复合材料进行了比较，对不同前体浓度和等离子体持续时间下合成的复合材料也进行了比较。结果表明，增加前体浓度和等离子体持续时间会提高复合材料中两种金属氧化物的含量，而由于其标准电位较高，铁氧化物的沉积条件比锰氧化物更有利。在等离子体持续时间最长和锰浓度最高的条件下处理的复合材料在循环稳定性和等效串联电阻方面优于其他复合材料。此外，从它们中选择的新型复合材料在电化学性能方面优于原始 AC 材料，甚至优于两种基于单金属的复合材料，这主要归因于两种金属氧化物的协同效应。因此，所提出的方法可用于修饰现有的和未来的复合电极，以相对便宜的主体和客体材料来提高其性能。
