Graphene quantum dots/graphene fiber nanochannels for osmotic power generation
Over the past few years, several nanofluidic channels have been constructed using ion-conductive materials. However, the design and fabrication of surface-charge-controllable nanochannels remain a scientific as well as a technological challenge. This study investigated the feasibility of graphene ox...
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Published in | Journal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 41; pp. 23727 - 23732 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
2019
|
Subjects | |
Online Access | Get full text |
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Summary: | Over the past few years, several nanofluidic channels have been constructed using ion-conductive materials. However, the design and fabrication of surface-charge-controllable nanochannels remain a scientific as well as a technological challenge. This study investigated the feasibility of graphene oxide (GO)-based fiber-type nanochannels for generating electrical energy by converting the salinity gradient. Owing to their large lateral size and the localized charged species on the edge, the low charge density of the GO fibers remains a critical bottleneck in their wider investigation. To address this critical issue, highly negatively charged and extremely small (2.42 ± 0.38 nm) graphene quantum dots (GQDs) were synthesized and intercalated through the interstitial network of GO sheets in fibers. With the application of GQDs, the charge density was significantly increased to 1.12 mC m
−2
so that the ion conductance was enhanced to an average of 21 nS and the electrical energy generation was 0.25 W m
−2
. This study presents a facile and novel approach of enhancing ion selectivity and ion conductivity of graphene-fiber based miniaturized nanofluidic channels, proving their potential for osmotic energy generation and efficiency.
Graphene quantum dots were intercalated into graphene fiber nanochannel as a nano-charger for high surface charge density. The hybrid nanochannel shows efficient ion transport behaviors and ion selectivity facilitating superior osmotic power generation. |
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Bibliography: | 10.1039/c9ta05242a Tae Hee Han is an Associate Professor in the Department of Organic and Nano Engineering at Hanyang Univeristy and the group leader in the Hybrid Functional Nano Materials Laboratory, Seoul, Korea since 2012. He obtained his PhD in the Department of Materials Science and Engineering at KAIST in 2010 and was a Postdoctoral Fellow in the Department of Materials Science and Engineering at Northwestern University until 2012. His research interests include the liquid crystalline assembly of soft 2-dimentional nanomaterials into fibers and films, and their energy harvesting/conversion applications. Electronic supplementary information (ESI) available: Supplementary figure (Fig. S1) See DOI |
ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/c9ta05242a |