Journal
ENERGY STORAGE MATERIALS
Volume 23, Issue -, Pages 594-601Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2019.03.024
Keywords
Bacterial cellulose; Metal-organic frameworks; Template-sacrificing; Solid-state supercapacitor; Areal energy density
Funding
- National Natural Science Foundation of China [51573077, 51861145401]
- Natural Science Foundation of Jiangsu Province of China [BK20170834]
- Open Project Program of State Key Laboratory of Organic -Inorganic Composites [oic-201701009]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Conductive bacterial cellulose (BC) membranes are a fascinating class of lightweight and flexible electrodes for electrochemical energy storage. Herein, we demonstrate a simple and efficient method to prepare polypyrrole (PPy)-coated BC electrodes via a template-sacrificing polymerization. Polydopamines serve as the interfacial modifier for the engagement of ZIF-67 polyhedrons along the BC nanofibers. Subsequent metal-organic frameworks-template sacrificing polymerization results in well-ordered PPy alignments along BC nanofibers to afford recovered electrolyte accessible channels. The binder-free electrode exhibits a high areal capacitance of 1.71 F cm(-2) (0.4 mA cm(-2)) and an excellent capacitance retention of 59.8% at 20 mA cm(-2). We further use the electrodes to assemble a flexible symmetric supercapacitor, which shows an areal energy density of 89.8 mu Wh cm(-2) at a power density of 0.31 mW cm(-2). This work holds great promise in fabricating flexible electrodes for portable energy storage devices.
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