Two-Dimensional Ti3C2Tx MXene Membranes as Nanofluidic Osmotic Power Generators
Kim, In S.
Tang, Chuyang Y.
Alshareef, Husam N.
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Environmental Nanotechnology Lab
Environmental Science and Engineering
Environmental Science and Engineering Program
Functional Nanomaterials and Devices Research Group
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Water Desalination & Reuse Center
Water Desalination and Reuse Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia, 23955-6900
Water Desalination and Reuse Research Center (WDRC)
Embargo End Date2020-07-15
Permanent link to this recordhttp://hdl.handle.net/10754/656189
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AbstractSalinity-gradient is emerging as one of the promising renewable energy sources but its energy conversion is severely limited by unsatisfactory performance of available semipermeable membranes. Recently, nanoconfined channels, as osmotic conduits, have shown superior energy conversion performance to conventional technologies. Here, ion selective nanochannels in lamellar Ti3C2Tx MXene membranes are reported for efficient osmotic power harvesting. These subnanometer channels in the Ti3C2Tx membranes enable cation-selective passage, assisted with tailored surface terminal groups, under salinity gradient. A record-high output power density of 21 W·m–2 at room temperature with an energy conversion efficiency of up to 40.6% is achieved by controlled surface charges at a 1000-fold salinity gradient. In addition, due to thermal regulation of surface charges and ionic mobility, the MXene membrane produces a large thermal enhancement at 331 K, yielding a power density of up to 54 W·m–2. The MXene lamellar structure, coupled with its scalability and chemical tunability, may be an important platform for high-performance osmotic power generators.
CitationHong, S., Ming, F., Shi, Y., Li, R., Kim, I. S., Tang, C. Y., … Wang, P. (2019). Two-Dimensional Ti3C2Tx MXene Membranes as Nanofluidic Osmotic Power Generators. ACS Nano, 13(8), 8917–8925. doi:10.1021/acsnano.9b02579
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST) center applied research fund (CARF) awarded to Water Desalination and Reuse Center (WDRC). C.Y.T. was funded by the Research Grants Council of the Hong Kong Special Administration Region, China (C7051-17G).
PublisherAmerican Chemical Society (ACS)