Download Final Presentation

csep.cnsi.ucsb.edu

Download Final Presentation

University of California at Santa BarbaraCalifornia NanoSystems InstituteAugust 26 th , 2011Mentor:Brian GieraENHANCING MEAN-FIELDMODELS FOR ELECTRICFaculty Advisors:Dr. Todd SquiresDr. Scott ShellDOUBLE LAYERCAPACITORSDavid HydeDavid RodriguezJessica Mendez


SUPERCAPACITORS• Applications• Stabilizing the national power grid• Efficient, eco-friendly energy stores• Buses and cars• Limitations• Energy does not last long• Too expensive for widespread use2


ELECTRIC DOUBLE LAYER THEORYlbl.gov3


DESIGN AND IMPACT OF RESEARCHAcknowledginglimitations ofGouy-ChapmantheoryImprovingtheoreticalmodels withcomputersimulationsMakingsupercapacitorsmore efficientReducing costsand promotingsustainabilitybgce.descientificamerican.com4


ADVANCING THE MODEL1. Write LAMMPS script for EDL simulation2. Setup script for various configurations• Change relative and absolute ion sizes3. Run script on CNSI/LANL supercomputers• Enables several simulations to run at once• Simulations take just over 1 day to run5


ADVANCING THE MODEL4. Graph charge concentrations vs. distance from electrode toshow real results5. Use MD data to guide development of theorylbl.gov6


MOLECULAR DYNAMICS DEMO7


EFFECTS OF DIFFERENT ION SIZESDensity profile of attracted ionsCharge ConcentrationIncreasing charge on electrodeDistance8


EFFECTS OF DIFFERENT ION SIZESDensity profile of repelled ionsCharge ConcentrationIncreasing charge on electrodeDistance9


EFFECTS OF DIFFERENT ION SIZESCharge ConcentrationProfile of net chargeIncreasing charge on electrodeDistance10


EFFECTS OF LARGE ION SIZESDensity profile of attracted ionsCharge ConcentrationIncreasing charge on electrodeDistance11


EFFECTS OF LARGE ION SIZESDensity profile of repelled ionsCharge ConcentrationIncreasing charge on electrodeDistance12


PROJECT SUCCESS & FUTURE WORK• Predicted oscillations did occur• Key is volume fraction, though, not just relative ion sizes• Found regime where Gouy-Chapman theory fails• Does very good job, though, for certain setups• Combine relative and absolute ion size changes• Develop mathematical model of our results• Translate our developments to industry13


ACKNOWLEDGEMENTS• Brian Giera • Dr. Todd Squires • Dr. Scott Shell14


VOLTAGE PROFILE (OSCILLATING CASE)16

More magazines by this user
Similar magazines