Preparation of self-doped nitrogen porous carbon derived from MOFs and its electrochemical properties as a composite ele
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Preparation of self‑doped nitrogen porous carbon derived from MOFs and its electrochemical properties as a composite electrode material Chi Zhang1 · Jing Yang1 · Jianqiang Zhang1 · Xia Zhao1 · Huixia Feng1 · Heming Luo1 Accepted: 3 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Metal–organic framework compounds with abundant network structures are widely used in gas separation and storage, non-linear optics, catalysis, functional materials, and other applications. Here, self-doped nitrogen porous carbon was prepared by a one-step carbonization of Z n2(ATRZ)2SO4·3H2O synthesized using a hydrothermal method. The self-doped nitrogen porous carbon material (ZYC-800) features a three-dimensional network structure, high specific surface area of 725 m2 g−1, and high nitrogen (7.26%) and oxygen (5.46%) contents. Consequently, the ZYC-800 electrode shows a high specific capacitance of 205.5 F g−1 at a current density of 1.0 A g−1 and high capacitance retention rate of 71.1% after 5000 cycles. Moreover, a composite electrode material (ZYC-800-5.3) with small redox additives was prepared and showed a high specific capacitance of 274.1 F g −1 at a current density of 1.0 A g −1. After 5000 cycles, the capacitance retention rate is 72.8%. The results show that the addition of redox additives in self-doped nitrogen porous carbon is an effective method in the development of high performance supercapacitors. Keywords Metal–organic framework compounds · Hydrothermal method · Self-doped nitrogen porous carbon · Composite electrode materials
1 Introduction High energy storage devices are of great interest in industry and academia owing to the increasing demand for renewable energy resources [1, 2]. Among them, supercapacitors are receiving great attention due to their remarkable advantages in specific energy compared to conventional capacitors [3–6]. Some effective and useful approaches to improve specific capacitance of materials for supercapacitors are as follows: (i) preparation of graded porous carbon with high specific surface area; (ii) the doping of heteroatoms (e.g. N, B, P, S, etc.), adjusting surface structure and pore size distribution of carbon materials; and (iii) surface hydrophilicity improvement of carbon materials and the capacitance of materials [7–9]. Also, some studies have shown that the electrochemical performance of supercapacitors can be improved by incorporating a small amount of redox additives into the electrolyte [10–13]. However, recent studies * Heming Luo [email protected] 1
School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, China
have shown that incorporating redox additives into electrode materials is a favorable platform to enhance the supercapacitance performance of materials quickly, efficiently, and economically [14]. MOFs (metal–organic frameworks) are skeleton compounds formed by the connection of transition metals with organic ligands containing oxygen or nitrogen. Due to its controllable composition and hig
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