TY - JOUR
T1 - Porous Ti3C2Tx MXene Membranes for Highly Efficient Salinity Gradient Energy Harvesting
AU - Hong, Seunghyun
AU - El Demellawi, Jehad K.
AU - Lei, Yongjiu
AU - Liu, Zhixiong
AU - Marzooqi, Faisal Al
AU - Arafat, Hassan A.
AU - Alshareef, Husam N.
N1 - KAUST Repository Item: Exported on 2022-01-18
Acknowledgements: Research reported in this work was supported by King Abdullah University of Science and Technology (KAUST).
PY - 2022/1/9
Y1 - 2022/1/9
N2 - Extracting 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 Ti3C2Tx MXene sheets, exhibiting simultaneous enhancement in permeability and ion selectivity beyond their inherent trade-off. The perforated nanopores formed by facile H2SO4 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 Ti3C2Tx MXene membranes reaches up to 17.5 W·m-2 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.
AB - Extracting 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 Ti3C2Tx MXene sheets, exhibiting simultaneous enhancement in permeability and ion selectivity beyond their inherent trade-off. The perforated nanopores formed by facile H2SO4 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 Ti3C2Tx MXene membranes reaches up to 17.5 W·m-2 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.
UR - http://hdl.handle.net/10754/674975
UR - https://pubs.acs.org/doi/10.1021/acsnano.1c08347
U2 - 10.1021/acsnano.1c08347
DO - 10.1021/acsnano.1c08347
M3 - Article
C2 - 35000386
SN - 1936-0851
JO - ACS Nano
JF - ACS Nano
ER -