TY - JOUR
T1 - Two-Dimensional Ti3C2Tx MXene Membranes as Nanofluidic Osmotic Power Generators
AU - Hong, Seunghyun
AU - Ming, Fangwang
AU - Shi, Yusuf
AU - Li, Renyuan
AU - Kim, In S.
AU - Tang, Chuyang Y.
AU - Alshareef, Husam N.
AU - Wang, Peng
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This 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).
PY - 2019/7/17
Y1 - 2019/7/17
N2 - Salinity-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.
AB - Salinity-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.
UR - http://hdl.handle.net/10754/656189
UR - http://pubs.acs.org/doi/10.1021/acsnano.9b02579
UR - http://www.scopus.com/inward/record.url?scp=85071708965&partnerID=8YFLogxK
U2 - 10.1021/acsnano.9b02579
DO - 10.1021/acsnano.9b02579
M3 - Article
C2 - 31305989
SN - 1936-0851
VL - 13
SP - 8917
EP - 8925
JO - ACS Nano
JF - ACS Nano
IS - 8
ER -