Preparation of N, P self-doped activated carbon hollow fibers derived from liquefied wood
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Preparation of N, P self‑doped activated carbon hollow fibers derived from liquefied wood Lina Wang1 · Xiaojun Ma1 Received: 15 April 2020 / Accepted: 3 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The heteroatom self-doped activated carbon hollow fibers from liquefied wood (ACHFs) were prepared by melt spinning, half-curing, carbonization and activation using steam. The results showed that the ACHFs with N and P doping exhibited high specific surface area (1896.6–2040.8 m 2g−1) and total pore volume (1.02–1.058 3 −1 cm g ). It was also found that the mechanisms of P from catalyst and N from curing agent were different in the formation of pore structure of ACHFs. When applied to supercapacitor, the ACHF-N10P16 can deliver a high specific capacitance of 151 F g−1 at current density of 1 A g−1 in 6 M KOH electrolyte. In addition, ACHFs displayed the synergistic advantages of pseudo-capacitance and double-layer capacitance because of N and P doping. As a result, the ACHFs with adjustable heteroatom doping have a broad application prospect in electrochemical energy storage.
Introduction Supercapacitor is one of the most promising electrochemical energy storage systems, which has attracted more and more attention because of its high power, excellent cycle stability and reversibility. So far, various carbonaceous materials have been widely studied as electrode materials for supercapacitors, such as activated carbon (Frackowiak 2007), carbon fiber (Xu et al. 2008), carbon nanotubes (An et al. 2001), graphene (Zhang et al. 2010), carbon spheres and carbon aerogels (Chen et al. 2013). Activated carbon fiber (ACF) has been widely studied because of its large specific surface area, light weight, easy production and so on. In addition, a large number of micropores directly lead to the outside of activated carbon fibers, accelerating the adsorption/desorption rate of molecules (Frackowiak 2007; Inagaki 2009). In recent years, biomass-activated carbon prepared from agricultural and forestry wastes is becoming more and more interesting because of its low cost, * Xiaojun Ma [email protected] 1
College of Light Industry Science and Engineering, Tianjin University of Science and Technology, Tianjin 300222, China
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Wood Science and Technology
sustainable development, abundant sources, excellent electrochemical performance and so on (Ganesan et al. 2014; Li et al. 2012; Long et al. 2015; Sodtipinta et al. 2017; Yu et al. 2017). However, for most biomass-derived carbon-based materials, compared with other carbonaceous materials (such as template carbon and carbidederived carbon), it is relatively difficult to achieve designable physical structures because of the complexity and diversity of sources (Liu et al. 2017). Heteroatom doping (such as N, P, B and S) has been proved to be a promising method to significantly improve electrochemical performance. The electronic structure, atomic radius and electronegativity of heteroatoms are different from those of carbon
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