High-performance carbon-coated ZnMn2O4 nanocrystallite supercapacitors with tailored microstructures enabled by a novel solution combustion method
High-performance carbon-coated ZnMn2O4 nanocrystallite supercapacitors with tailored microstructures enabled by a novel solution combustion method
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DOI：
10.1016/j.jpowsour.2017.12.022
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发表时间：
2018-02-28
影响因子：
9.2
通讯作者：
Wu, Nae-Lih
中科院分区：
文献类型：
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作者：
Abdollahifar, Mozaffar;Huang, Sheng-Siang;Wu, Nae-Lih
虽然ZnMn 2 O 4作为锂离子电池阳极被广泛研究，但为超级电容器应用定制合适的氧化物微结构仍然是一个挑战。碳包覆的ZnMn 2 O 4（C@ZMO）纳米晶在中性电解质水溶液中表现出高性能的赝电容器行为，首次成功地通过一种新的溶液燃烧过程，使用聚乙二醇作为多功能的微观结构导向剂合成。控制燃烧溶液中聚合物的分子量和量使得能够通过一锅法合成工艺形成高度结晶的C@ZMO，所述高度结晶的C@ZMO具有基本上更高的（超过5倍）比表面积，具有中孔结构和保形碳涂层。在Na 2SO 4（aq）电解质中得到的C@ZMO超级电容器电极表现出理想的电容行为，比电容高达150 F g（-1），并且循环稳定性显示在10，000次循环后在60%的全容量和> 99%的库仑效率下没有电容衰减。这项研究不仅说明了一种新的强大的合成路线，能够生产用于储能应用的导电介孔结晶氧化物基纳米材料，而且还揭示了一类新的高性能赝电容材料，用于中性水性电解质。
Although ZnMn2O4 is widely studied as Li-ion battery anodes, it remains a challenge to tailor suitable microstructures of the oxide for supercapacitor applications. Carbon-coated ZnMn2O4 (C@ZMO) nanocrystallites showing high-performance pseudocapacitor behaviours in neutral aqueous electrolyte are for the first time successfully synthesised via a novel solution combustion process using polyethylene glycol as a multifunctional microstructure-directing agent. Controlling the molecular weight and amount of the polymer in the combustion solution enables the formation of highly-crystalline C@ZMO having substantially higher, by more than 5 folds, specific surface areas with mesoporous structures and conformal carbon coating via the one-pot synthesis process. The resulting C@ZMO supercapacitor electrodes in Na2SO4(aq) electrolyte exhibit ideal capacitive behaviours with specific capacitances up to 150 F g(-1) and cycle stability showing no capacitance fade after 10,000 cycles at 60% of full capacity and > 99% Coulombic efficiency. This study not only illustrates a new powerful synthesis route capable of producing conductive mesoporous crystalline oxide-based nanomaterials for energy storage applications but also reveals a new class of high-performance pseudocapacitive materials for neutral aqueous electrolytes.