Jump to main content
Jump to site search


Dual potassium salts-assisted lyophilization of natural fibres for high-yield synthesis of one-dimensional carbon microtubes for supercapacitor and oxygen reduction reaction

Abstract

One-dimensional kapok fibre-derived carbon microtubes (KCMT) were synthesized by the dual potassium salts-assisted lyophilization of biochar. The optimal KCMT not only possesses the well-developed porous, microtubular architecture with large specific surface area but also presents the high production yield (55.3%) owing to the moderate effect of molten potassium salts. The optimum material manifests excellent capacitive performance, including large mass specific capacitance (380.1 F g–1 in the alkaline electrolyte), high energy density (25.0 Wh kg–1 in the neutral electrolyte) and good cycling stability (capacitance retention of 90.1% after 8000 cycles). This synthetic strategy can be extended to the preparation of analogous CMT made from other natural fibres exemplified by poplar catkin and cotton wool. Further, the metal-free carbon-based electrocatalyst obtained by the post nitrogen doping of KCMT exhibits high catalytic activity towards the oxygen reduction reaction (ORR). Our synthetic approaches have substantiated good prospects for microtubular carbon-based materials of electrochemical energy-related technologies.

Back to tab navigation

Supplementary files

Article information


Submitted
29 Jan 2020
Accepted
20 Mar 2020
First published
23 Mar 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Dual potassium salts-assisted lyophilization of natural fibres for high-yield synthesis of one-dimensional carbon microtubes for supercapacitor and oxygen reduction reaction

J. Qi, W. Zhang, H. Zhou and L. Xu, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ00499E

Social activity

Search articles by author

Spotlight

Advertisements