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Nitrogen-doped carbon integrated nickel–cobalt metal phosphide marigold flowers as a high capacity electrode for hybrid supercapacitors
CrystEngComm ( IF 3.1 ) Pub Date : 2020-08-21 , DOI: 10.1039/d0ce01006e
Pragati A. Shinde 1, 2, 3, 4, 5 , Muhammad Farooq Khan 5, 6, 7, 8 , Malik A. Rehman 1, 2, 3, 4, 5 , Euigeol Jung 1, 2, 3, 4, 5 , Quang N. Pham 9, 10, 11, 12 , Yoonjin Won 9, 10, 11, 12 , Seong Chan Jun 1, 2, 3, 4, 5
Affiliation  

Metal–organic frameworks (MOFs) serve as expedient self-templated precursors to derive hybrid materials with various functionalities. This study develops a bimetallic MOF-derived approach for the facile synthesis of nitrogen-doped carbon integrated nickel–cobalt mixed metal phosphide (NiCoP/NC) using a controlled experimental procedure for supercapacitors. Here, the nitrogen-doped carbon nanosheet functions as a conductive framework and protective layer for NiCoP nanostructures and offers facile pathways for easy charge transfer, abundant surface active sites and improves the stability of the electrode. The marigold flower-like morphology of NiCoP nanostructures stores a large number of ions in their petals and shortens the ion diffusion length. The electrochemical analysis demonstrates that the as-designed NiCoP/NC electrode possesses a high specific capacity of 690.6 mA h g−1 (6.22 F cm−2) at 1 A g−1, high rate capability and excellent cycling stability. Additionally, a hybrid supercapacitor built with NiCoP/NC and activated carbon as positive and negative electrodes shows a maximum specific energy of 47 W h kg−1 at a specific power of 1666 W kg−1 and good capacity retention over 10 000 charge–discharge cycles. The present multicomponent approach combines the virtues of efficient redox chemistries of each element and N-doped carbon providing abundant surface active sites while stabilizing the active electrode material during repeated cycling.

中文翻译:

氮掺杂碳集成的镍钴金属磷化物万寿菊花作为混合超级电容器的高容量电极

金属有机框架(MOF)是方便的自我模板化前体,可衍生出具有各种功能的杂化材料。这项研究开发了一种双金属MOF衍生的方法,该方法可使用超级电容器的受控实验程序轻松地合成氮掺杂的碳整合的镍钴混合金属磷化物(NiCoP / NC)。在这里,氮掺杂的碳纳米片充当NiCoP纳米结构的导电框架和保护层,并提供了便捷的途径,易于电荷转移,丰富的表面活性位点并提高了电极的稳定性。NiCoP纳米结构的万寿菊花状形态在其花瓣中存储了大量离子,并缩短了离子扩散长度。在1 A g -1下-1(6.22 F cm -2),高倍率能力和出色的循环稳定性。此外,以NiCoP / NC和活性炭为正极和负极构建的混合超级电容器在1666 W kg -1的比功率下显示出47 W h kg -1的最大比能,在10000次充放电中具有良好的容量保持率周期。本发明的多组分方法结合了每种元素和提供大量表面活性位的N掺杂碳的有效氧化还原化学的优点,同时在重复循环过程中稳定了活性电极材料。
更新日期:2020-10-05
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