Journal
NANOMATERIALS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nano11123249
Keywords
polydopamine doping; cellulose nanofiber; pyrolysis; 3D porous nanocarbon; supercapacitor
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Funding
- Nanotechnology Platform Project (Nanotechnology Open Facilities in Osaka University) from the Ministry of Education, Culture, Sports, Science and Technology, Japan [JPMXP09S21OS0029]
- Japan Prize Heisei Memorial Research Grant Program
- JST FOREST Program [JPMJFR2003]
- [JP20J11624]
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Biomass-derived 3D porous nanocarbons, fabricated from cellulose by pyrolysis with polydopamine doping, show improved carbon yield and volume retention, larger specific surface area and electrical conductivity, and higher specific capacitance as a supercapacitor electrode compared to cellulose-derived nanocarbons without polydopamine doping.
Biomass-derived three-dimensional (3D) porous nanocarbons have attracted much attention due to their high surface area, permeability, electrical conductivity, and renewability, which are beneficial for various electronic applications, including energy storage. Cellulose, the most abundant and renewable carbohydrate polymer on earth, is a promising precursor to fabricate 3D porous nanocarbons by pyrolysis. However, the pyrolysis of cellulosic materials inevitably causes drastic carbon loss and volume shrinkage. Thus, polydopamine doping prior to the pyrolysis of cellulose nanofiber paper is proposed to fabricate the 3D porous nanocarbons with improved yield and volume retention. Our results show that a small amount of polydopamine (4.3 wt%) improves carbon yield and volume retention after pyrolysis at 700 degrees C from 16.8 to 26.4% and 15.0 to 19.6%, respectively. The pyrolyzed polydopamine-doped cellulose nanofiber paper has a larger specific surface area and electrical conductivity than cellulose nanofiber paper that without polydopamine. Owing to these features, it also affords a good specific capacitance up to 200 F g(-1) as a supercapacitor electrode, which is higher than the recently reported cellulose-derived nanocarbons. This method provides a pathway for the effective fabrication of high-performance cellulose-derived 3D porous nanocarbons.
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