Journal
NANOMATERIALS
Volume 8, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/nano8040215
Keywords
graphene oxide; hydrothermal treatment; hydrolysis; humic acid; supercapacitor
Categories
Funding
- National Natural Science Foundation of China [U1361119, 51404098, 51174077]
- Key Scientific Research Project of Colleges and Universities in Henan Province [18A440002]
- Foundation of Henan Polytechnic University for Ph. D [B2014-008]
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The conventional synthesis route of graphene oxide (GOG), based on Hummers method, suffers from explosion risk, environmental concerns and a tedious synthesis process, which increases production costs and hinders its practical applications. Herein, we report a novel strategy for preparing few-layer graphene oxide (GOH) from humic acid via simple hydrothermal treatment. The formation of GO(H) is mainly attributed to the hydrolysis, oxidation and aromatization of humic acid under hydrothermal conditions. The as-prepared few-layer GO(H) has typical morphology (thin and crumpled sheets with the thickness of similar to 3.2 nm), crystal structure (a Raman I-D/I-G ratio of 1.09) and chemical composition (an X-ray Photoelectron Spectroscopy (XPS) O/C atomic ratio of 0.36) of few-layer GOG. The thermally reduced GOH (r-GO(H)) delivers considerable area capacitance of 28 mu F.cm(-2), high rate capability and low electrochemical resistance as supercapacitor electrodes. The described hydrothermal process shows great promise for the cheap, green and efficient synthesis of few-layer graphene oxide for advanced applications.
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