Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 144, Issue 30, Pages 13764-13772Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c04663
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Funding
- Australian Research Council Discovery Program [DP190103290]
- Australian Research Council Future Fellowships [FT200100730, FT210100804]
- Australian Research Council [FT210100804] Funding Source: Australian Research Council
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This study presents a strategy to optimize the ion transportation of two-dimensional nanomaterial membranes for improving osmotic energy harvest (OEH) by introducing self-exfoliated oxidative fragments (OFs) from graphene oxide in nanochannels. The results show improved power density and cation selectivity, making it a promising approach for ion separation, OEH, and other nano-fluidic applications.
Introducing alien intercalations to sub-nanometer scale nanochannels is one desirable strategy to optimize the ion transportation of two-dimensional nanomaterial membranes for improving osmotic energy harvest (OEH). Diverse intercalating agents have been previously utilized to realize this goal in OEH, but with modest performance, complex operations, and physicochemical uncertainty gain. Here, we employ the self-exfoliation behavior of oxidative fragments (OFs) from graphene oxide basal plane under an alkaline environment to encapsulate detached OFs in nanochannels for breaking a trade-off between permeability and selectivity, boosting power density from 1.8 to 4.9 W m(-2) with a cation selectivity of 0.9 and revealing a negligible decline in power density and trade-off during a long-term operation test (similar to 168 h). The strategy of membrane design, employing the intrinsically self-exfoliated OFs to decorate the nanochannels, provides an alternative and facile approach for ion separation, OEH, and other nano-fluidic applications.
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