The reduction of carbon dioxide (CO2) to value-added products is top-of-mind. In this arena, chemists are well-positioned to lead the charge. Herein, we present advances made in homogeneous CO2 reduction using transition met...
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Nitrogen‐Doped Cellulose‐Derived Porous Carbon Fibers for High Mass‐Loading Aqueous Supercapacitors
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Nitrogen-doped cellulose-derived porous carbon fibers (N-CHPCs) with controllable surface properties and microstructure were prepared to fabricate aqueous supercapacitor with high electrochemical performance at high mass loading of 12.8 mg cm−2, which may pave a new way to biomass-derived functional carbon materials for advanced aqueous supercapacitors and beyond.
Abstract
Biomass-based porous carbon with renewability and flexible structure tunability is a promising electrode material for supercapacitors. However, there is a huge gap between experimental research and practical applications. How to maintain good electrochemical performance of high mass-loading electrodes and suppress the self-discharge of supercapacitors is a key issue that urgently needs to be addressed. The structure regulation of electrode materials such as heteroatom doping is a promising optimization strategy for high mass-loading electrodes. In this work, nitrogen-doped cellulose-derived porous carbon fibers (N-CHPCs) were prepared by a facile bio-template method using cotton cellulose as raw material and urea as dopant. The prepared N-CHPCs have high specific surface area, excellent hierarchical porous structure, partial graphitization properties and suitable heteroatom content. The assembled high mass-loading (12.8 mg cm−2; 245 μm) aqueous supercapacitor has excellent electrochemical performance, i. e., low open-circuit voltage attenuation rate (21.39 mV h−1), high voltage retention rate (78.81 %), high specific capacitance (295.8 F g−1 at 0.1 A g−1), excellent area capacitance (3.79 F cm−2 at 0.1 A g−1), excellent cycling stability (97.28 % over 20,000 cycles at 1.0 A g−1). The excellent performance of high mass-loading N-CHPCs is of great significance for their practical applications in advanced aqueous supercapacitors.
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