MnO2-deposited lignin-based carbon nanofiber mats for application as electrodes in symmetric pseudocapacitors

초록

Low-cost, high-performance electrodes are highly attractive for practical supercapacitor applications. MnO2-deposited carbon nanofiber mats (MnO2-CNFMs) are prepared for use as binder-free supercapacitor electrodes. MnO2 is deposited on the mats in situ by hydrothermally decomposing aqueous KMnO4, leading to the formation of nanocrystals of MnO2. The MnO2-CNFM electrode produced with 38.0 mu mol KMnO4 (this electrode) shows a high specific capacitance of similar to 171.6 F.g(-1) at a scan rate of 5 mV.s(-1). Moreover, a symmetric supercapacitor with the electrode exhibits a specific capacitance of 67.0 F.g(-1), an energy density of 6.0 Wh.kg(-1) and a power density of 160 W.kg(-1) at a special current of 0.1 A.g(-1). Further, the symmetric supercapacitor displays excellent cycling stability, retains approximately 99% of the capacitance after 1000 cycles. The simplicity and ease of preparation of the MnO2-CNFMs as well as their suitability for use in coin-type supercapacitor cells make them ideal for application in cost-effective and high-performance electrodes for supercapacitors. (C) 2018 Elsevier B.V. All rights reserved.

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