Porous Ti3C2Tx MXene Membranes for Highly Efficient Salinity Gradient Energy Harvesting
El Demellawi, Jehad K.
Marzooqi, Faisal Al
Arafat, Hassan A.
Alshareef, Husam N.
KAUST DepartmentBiological and Environmental Science and Engineering (BESE) Division
Material Science and Engineering
Physical Science and Engineering (PSE) Division
Material Science and Engineering Program
Permanent link to this recordhttp://hdl.handle.net/10754/674975
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AbstractExtracting osmotic energy through nanoporous membranes is an efficient way to harvest renewable and sustainable energy using the salinity gradient between seawater and river water. Despite recent advances of nanopore-based membranes, which have revitalized the prospect of blue energy, their energy conversion is hampered by nanomembrane issues such as high internal resistance or low selectivity. Herein, we report a lamellar-structured membrane made of nanoporous Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene sheets, exhibiting simultaneous enhancement in permeability and ion selectivity beyond their inherent trade-off. The perforated nanopores formed by facile H<sub>2</sub>SO<sub>4</sub> oxidation of the sheets act as a network of cation channels that interconnects interplanar nanocapillaries throughout the lamellar membrane. The constructed internal nanopores lower the energy barrier for cation passage, thereby boosting the preferential ion diffusion across the membrane. A maximum output power density of the nanoporous Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene membranes reaches up to 17.5 W·m<sup>-2</sup> under a 100-fold KCl gradient at neutral pH and room temperature, which is as high as by 38% compared to that of the pristine membrane. The membrane design strategy employing the nanoporous two-dimensional sheets provides a promising approach for ion exchange, osmotic energy extraction, and other nanofluidic applications.
CitationHong, S., El-Demellawi, J. K., Lei, Y., Liu, Z., Marzooqi, F. A., Arafat, H. A., & Alshareef, H. N. (2022). Porous Ti3C2Tx MXene Membranes for Highly Efficient Salinity Gradient Energy Harvesting. ACS Nano. doi:10.1021/acsnano.1c08347
SponsorsResearch reported in this work was supported by King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)
Except where otherwise noted, this item's license is described as copyright © American Chemical Society. This is an open access article under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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