Natural Cellulose Fiber as Substrate for Supercapacitor
Natural Cellulose Fiber as Substrate for Supercapacitor
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DOI：
10.1021/nn401818t
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发表时间：
2013-07-01
期刊：
影响因子：
17.1
通讯作者：
Lee, Sang Bok
中科院分区：
文献类型：
--
作者：
Gui, Zhe;Zhu, Hongli;Lee, Sang Bok
具有多孔结构和电解质吸收性能的纤维素纤维被认为是一种很好的用于沉积储能材料的潜在基底。与传统的基底，如金或不锈钢不同，本研究中由纤维素纤维制备的纸不仅用作具有大表面积的基底，而且还用作内部电解质储库，其中电解质可以在纤维素纤维中吸收很多，并准备扩散到储能材料中。我们通过比较一系列基于自制纤维素纸或聚酯纺织品的分层混合超级电容器电极来证明这种内部电解质储库的价值，所述纤维素纸或聚酯纺织品通过简单的溶液浸渍和用MnO 2电沉积而与碳纳米管（this）集成。使用Al 2 O3在纤维表面上的原子层沉积来限制电解质吸收到纤维中以用于比较。比较了不同数量的离子扩散通道设计的纤维素纤维在纸中可以作为一个良好的内部电解质水库，并提供了一个有效的通道，离子传输促进。使用额外的CNT涂层的进一步优化导致纸/CNT/MnO 2/CNT的电极，其具有双离子扩散和电子转移途径，并表现出上级超级电容性能。本文重点介绍了介孔纤维素纤维作为超级电容器电极基底的优点，其中纤维素纤维的吸水膨胀效应可以吸附电解质，纤维的介孔内部结构可以为离子扩散到电化学储能材料提供通道。
Cellulose fibers with porous structure and electrolyte absorption properties are considered to be a good potential substrate for the deposition of energy material for energy storage devices. Unlike traditional substrates, such as gold or stainless steel, paper prepared from cellulose fibers in this study not only functions as a substrate with large surface area but also acts as an interior electrolyte reservoir, where electrolyte can be absorbed much in the cellulose fibers and is ready to diffuse into an energy storage material. We demonstrated the value of this internal electrolyte reservoir by comparing a series of hierarchical hybrid supercapacitor electrodes based on homemade cellulose paper or polyester textile integrated with carbon nanotubes (this) by simple solution dip and electrodeposited with MnO2. Atomic layer deposition of Al2O3 onto the fiber surface was used to limit electrolyte absorption into the fibers for comparison. Configurations designed with different numbers of ion diffusion pathways were compared to show that cellulose fibers in paper can act as a good interior electrolyte reservoir and provide an effective pathway for ion transport facilitation. Further optimization using an additional CNT coating resulted in an electrode of paper/CNTs/MnO2/CNTs, which has dual ion diffusion and electron transfer pathways and demonstrated superior supercapacitive performance. This paper highlights the merits of the mesoporous cellulose fibers as substrates for supercapacitor electrodes, in which the water-swelling effect of the cellulose fibers can absorb electrolyte, and the mesoporous internal structure of the fibers can provide channels for ions to diffuse to the electrochemical energy storage materials.