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The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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Double layer capacitance of anode/solid-electrolyte interfaces.

Xiaoming Ge¹, Changjing Fu, Siew Hwa Chan

¹School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798. ge0001ng@e.ntu.edu.sg

Physical Chemistry Chemical Physics : PCCP

|July 26, 2011

Summary

Investigating lanthanum strontium vanadate (LSV)/yttria-stabilized zirconia (YSZ) interfaces in solid oxide fuel cells reveals capacitance patterns crucial for device performance. Understanding double layer capacitance provides a more accurate triple-phase boundary estimate.

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Area of Science:

Materials Science
Electrochemistry
Surface Science

Background:

The electrode/electrolyte interface's double layer significantly impacts solid-state electrochemical cell performance.
Double layer capacitance is a key descriptor of this interface.
Lanthanum strontium vanadate (LSV) and yttria-stabilized zirconia (YSZ) are critical materials in solid oxide fuel cells (SOFCs).

Purpose of the Study:

To investigate the double layer capacitance at LSV/YSZ interfaces under SOFC anode conditions.
To differentiate between apparent and intrinsic double layer capacitance.
To correlate capacitance behavior with applied anodic bias.

Main Methods:

Utilizing electrochemical impedance spectroscopy to measure apparent double layer capacitance.
Applying Stern's method and Volta potential analysis to determine intrinsic double layer capacitance.
Examining LSV/YSZ interfaces under varying anodic biases (0–150 mV).

Main Results:

Both apparent and intrinsic double layer capacitances showed right-skewed volcano patterns with increasing anodic bias.
Apparent capacitance was approximately one order of magnitude higher than intrinsic capacitance.
The discrepancy was attributed to differences in the effective surface areas considered.

Conclusions:

The study provides a method for evaluating intrinsic double layer capacitance at LSV/YSZ interfaces.
Understanding the difference between apparent and intrinsic capacitance is vital for accurate device modeling.
This analysis offers a more realistic estimation of the triple-phase boundary (TPB) in working SOFCs.