Flower-like Ni-Co hydroxides combined with mascroporous carbon tubes derived from eggplant as electrodes for supercapaci
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Flower-like Ni-Co hydroxides combined with mascroporous carbon tubes derived from eggplant as electrodes for supercapacitor application Xinrang Hu 1 & Rui Chen 1 & Qingsheng Wu 2 & Jiangfeng Li 1 Received: 20 May 2020 / Revised: 9 September 2020 / Accepted: 9 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Prussian blue analogues, Ni3[Fe(CN)6]2-Co3[Fe(CN)6]2-derived flower-like Ni-Co hydroxides coupled with eggplant-derived macroporous carbon tubes, have been prepared by chemical replacement method at room temperature. The composite electrode exhibits high specific capacitance (801 F g-1), rate stability (68.5 %), and cycle stability. It is indicted that the synergistic effect of the high conductivity of macroporous carbon tubes and flower-like structures contributes to the abundant active redox sites, thus delivering high electrochemical performance. Then, the prepared material in this study could be an ideal candidate as electrode materials for supercapacitor. Keywords Double hydroxides . Carbon nanotube . Compounds . Supercapacitor
Introduction Supercapacitor, as green energy storing device, has attracted great attentions in the last decades in the world owing to its high power density, long lifecycle, fast charge/discharge capability, safety, and environment-friendly [1–3]. Depending on the mechanism of energy storage, supercapacitor can be separated into two parts: double-layer capacitor (EDLC) and faradic pseudocapacitor. The carbon material-based EDLC shows high rate stability and long-cycle stability, while the transition-metal compound or polymer material-derived pseudocapacitor delivers high specific capacitance and energy density [4]. Therefore, the electrode material is an important factor determining the property of supercapacitors. Recently, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03806-z) contains supplementary material, which is available to authorized users. * Rui Chen [email protected] * Jiangfeng Li [email protected] 1
College of Ecology, Lishui University, Lishui 323000, People’s Republic of China
2
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, People’s Republic of China
the attention of researchers has focused on transition-metal compounds due to their high theoretical-specific capacitance, low cost and eco-friendly [5]. Based on this, transition-metal compounds with unique structures have been designed via template methods, which could improve their electrochemical performance. Recently, materials have been used in various fields through metal-organic frameworks (MOFs) as template due to their unique morphologies and structures. For supercapacitors, the MOF-derived materials always show high specific surface area and abundant porous, which could provide a large number of reactive sites and high electron transfer rate [6–8]. But, the low rate stability and bad cycling stability are two shortcomings of transitionmetal compounds based
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