Bipolar plates(BPs)are essential multifunctional components in vanadium redox flow batteries(VRFBs)that require excellent electrical conductivity,low permeability,and strong solid support for the stack.However,convent...Bipolar plates(BPs)are essential multifunctional components in vanadium redox flow batteries(VRFBs)that require excellent electrical conductivity,low permeability,and strong solid support for the stack.However,conventional BPs are based on graphite sheets,which provide mechanical properties and corrosion resistance but have limitations in terms of electrical conductivity.Although carbon nanotubes(CNTs)have excellent properties,CNT composites with low CNT volume fractions(10–20%)have increased electrolyte permeability and limited electrical conductivity improvement,resulting in low durability and efficiency for VRFBs.This study proposes a novel concept of horizontally aligned CNT nanocomposite bipolar plate(HACN-BP)to address these issues.The HACN-BPs feature an optimized conduction path with a CNT volume fraction of 59%,resulting in reduced manufacturing time while demonstrating superior conductivity and permeability compared to conventional BPs.Furthermore,integrated HACN-BP mitigates ohmic loss that occurs in the BPs,thereby mitigating the potential drop by 40%.Therefore,the utilization of HACN-BP shows superior performance compared to recent studies,a substantial improvement of more than 6%in energy efficiency and 14%in capacity over conventional BP.展开更多
We demonstrate the layer-by-layer(LbL)assembly of polyelectrolyte multilayers(PEM)on three-dimensional nanofiber scaffolds.High porosity(99%)aligned carbon nanotube(CNT)arrays are photolithographically patterned into ...We demonstrate the layer-by-layer(LbL)assembly of polyelectrolyte multilayers(PEM)on three-dimensional nanofiber scaffolds.High porosity(99%)aligned carbon nanotube(CNT)arrays are photolithographically patterned into elements that act as textured scaffolds for the creation of functionally coated(nano)porous materials.Nanometer-scale bilayers of poly(allylamine hydrochloride)/poly(styrene sulfonate)(PAH/SPS)are formed conformally on the individual nanotubes by repeated deposition from aqueous solution in microfluidic channels.Computational and experimental results show that the LbL deposition is dominated by the diffusive transport of the polymeric constituents,and we use this understanding to demonstrate spatial tailoring on the patterned nanoporous elements.A proof-of-principle application,microfluidic bioparticle capture using N-hydroxysuccinimide-biotin binding for the isolation of prostate-specific antigen(PSA),is demonstrated.展开更多
基金supported by the Nano&Material Technology Development Program through the National R&D Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(RS-202300260461).
文摘Bipolar plates(BPs)are essential multifunctional components in vanadium redox flow batteries(VRFBs)that require excellent electrical conductivity,low permeability,and strong solid support for the stack.However,conventional BPs are based on graphite sheets,which provide mechanical properties and corrosion resistance but have limitations in terms of electrical conductivity.Although carbon nanotubes(CNTs)have excellent properties,CNT composites with low CNT volume fractions(10–20%)have increased electrolyte permeability and limited electrical conductivity improvement,resulting in low durability and efficiency for VRFBs.This study proposes a novel concept of horizontally aligned CNT nanocomposite bipolar plate(HACN-BP)to address these issues.The HACN-BPs feature an optimized conduction path with a CNT volume fraction of 59%,resulting in reduced manufacturing time while demonstrating superior conductivity and permeability compared to conventional BPs.Furthermore,integrated HACN-BP mitigates ohmic loss that occurs in the BPs,thereby mitigating the potential drop by 40%.Therefore,the utilization of HACN-BP shows superior performance compared to recent studies,a substantial improvement of more than 6%in energy efficiency and 14%in capacity over conventional BP.
基金This work was supported by the MRSEC Program of the National Science Foundation under award number DMR-0819762.
文摘We demonstrate the layer-by-layer(LbL)assembly of polyelectrolyte multilayers(PEM)on three-dimensional nanofiber scaffolds.High porosity(99%)aligned carbon nanotube(CNT)arrays are photolithographically patterned into elements that act as textured scaffolds for the creation of functionally coated(nano)porous materials.Nanometer-scale bilayers of poly(allylamine hydrochloride)/poly(styrene sulfonate)(PAH/SPS)are formed conformally on the individual nanotubes by repeated deposition from aqueous solution in microfluidic channels.Computational and experimental results show that the LbL deposition is dominated by the diffusive transport of the polymeric constituents,and we use this understanding to demonstrate spatial tailoring on the patterned nanoporous elements.A proof-of-principle application,microfluidic bioparticle capture using N-hydroxysuccinimide-biotin binding for the isolation of prostate-specific antigen(PSA),is demonstrated.
