Trevor Yates Junior University of Cincinnati Adam McNeeley PreJunior University of Cincinnati William Barrett Sophomore University of Cincinnati GRA Abhinandh Sankar AC Dr Anastasios Angelopoulos ID: 225332
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Bismuth Nanoparticles as an Electrocatalyst
Trevor Yates, Junior, University of CincinnatiAdam McNeeley, Pre-Junior, University of Cincinnati William Barrett, Sophomore, University of Cincinnati GRA: Abhinandh SankarAC: Dr. Anastasios Angelopoulos
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Introduction
Basic Electrochemistry Cyclic VoltammetryLayer by Layer Assemblies (LbL)
Results and Interpretations
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Electrochemistry
The study of the flow of electrons in chemical reactions Redox ReactionsAnode and Cathode
Cell Potentials
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http://www.chem.latech.edu/~upali/chem102/102MSJc19.htm
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Equipment
PotentiostatUltrasonicator Voltammeter
Glassy Carbon electrode
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Cyclic Voltammetry
Voltage SweepBetween two set valuesCurrent Peaks
Scan Rates
Determined by user
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Important Equations
Faraday’s Lawm = (Q/F)*(M/z) (dm/dt) = (i/F)*(M/z)
Fick’s Law
J = -D*(dC/dz)
Randles-Sevcik Equation
i
= (F A
Mv
)/(4RT)
p
2
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Method (Layer by Layer)
Takes advantage of surface chargesGlassy Carbon (base)Cationic polymer (+)
Bismuth-Tin nanoparticles (-)
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Methods Cont.
Cleaning electrodePolishSoak in Aqua Regia (30-45mins)
Rinse with DI water
Ultrasonication (5mins)Dry (10-15mins)
Run cleaning sweep
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Conclusions
Polymer improves current density NaOH promotes electrochemical activity
More layers means higher current density
Fresh particles exhibit improved stability
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Goals
Understand loss of durability with time Incorporate CarbonBegin drafting final deliverables
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Timeline
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Thank You NSF!
Grant ID No. 0756921
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References
“CHEM 102 CLASS NOTES” by Upali Siriwardane. Louisiana Tech Chemistry. June 5th, 2003.http://www.chem.latech.edu/~upali/chem102/102MSJc19.htm
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