Electrochemical Impedance spectroscopy

WEEKLY PRESENTATION

ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY RESEARCH PROGRESS

12/09/2015

EQUIVALENT ELECTRICAL CIRCUIT OF A BATTERY

Resistance??

Impedance

IMPEDANCE SPECTROSCOPY

• Uses a small AC signal for the excitation.

• Output Signal

• Impedance of the circuit :

GRAPHICAL REPRESENTATION

• Nyquist Plot

• Body Plot

PHYSICAL CHEMISTRY AND EQUIVALENT CIRCUIT ELEMENT

• Electrolyte Resistance.

• Double Layer Capacitance.

• Polarization Resistance.

• Warburg Impedance.

ELECTOCHEMICAL IMPEDANCE SPECTROSCOPY

https://www.google.com/search?q=nyquist+plot+impedance&espv=2&biw=1366&bih=643&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjTiYT-_s7JAhUBQSYKHYO4Bb0Q_AUIBigB#imgrc=6n5zhv1NWmY_0M%3A

EIS

RESEARCH• NMC Synthesis , trying another sample.

• Finding ways to synthesize li-riched NMC material.

• Finding IQE and JSC for each subcell layer in the triple junction solar cell (Working with Jobayer)

• For finding Jsc, some doubts.

IQE and Jsc for GaP

IQE and Jsc for InGaAs

????

THANK YOU!!