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Analysis of nanofiber-based La0.2Sr0.8TiO3-Gd0.2Ce0.8O1.9 electrode kinetics
Yuwei Wang1, Erqing Zhao2, Liquan Fan1
1College of Materials Science and Engineering, Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar University No. 42, Wenhua Street Qiqihar 161006 China Liquan_Fan@163.com.
RSC Advances
|May 13, 2022
Summary
Nanofiber-based lanthanum strontium titanate-gadolinium doped ceria (LST-GDC) anodes show superior performance in solid oxide fuel cells compared to nanoparticle-based anodes. This is due to significantly lower potential drops, enhancing overall cell kinetics.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Conversion
Background:
- Solid oxide fuel cells (SOFCs) require efficient anode materials for optimal performance.
- Lanthanum strontium titanate-gadolinium doped ceria (LST-GDC) is a promising composite anode material.
- The morphology of LST-GDC (nanofiber vs. nanoparticle) can significantly impact its electrochemical properties.
Purpose of the Study:
- To compare the electrochemical performance of SOFCs utilizing nanofiber-based LST-GDC anodes versus nanoparticle-based LST-GDC anodes.
- To investigate the influence of anode material morphology on potential drops (ohmic and electrochemical) and overall cell kinetics.
- To determine the preferred morphology for enhanced SOFC anode performance.
Main Methods:
- Fabrication of two single SOFC cells: one with a nanofiber-based LST-GDC anode (Cell-1) and another with a nanoparticle-based LST-GDC anode (Cell-2).
- Measurement of electrolyte ohmic resistances using AC resistance measurements.
- Determination of total ohmic resistance via current interrupt method.
- Analysis of voltage-current (V-I) characteristics to evaluate potential drops and cell kinetics.
Main Results:
- Under a current density of 0.6 A cm⁻² at 850 °C, the nanofiber-based anode (NF-LST-GDC) exhibited significantly lower potential drops: 0.007 V (electrode ohmic) and 0.080 V (electrochemical reaction).
- In contrast, the nanoparticle-based anode (NP-LST-GDC) showed higher potential drops: 0.159 V (electrode ohmic) and 0.246 V (electrochemical reaction).
- Cell-1 (nanofiber-based anode) demonstrated superior kinetics compared to Cell-2 (nanoparticle-based anode).
Conclusions:
- The nanofiber morphology of LST-GDC composite anodes leads to substantially lower electrode ohmic and electrochemical reaction potential drops compared to nanoparticle morphology.
- The enhanced kinetics observed in the nanofiber-based anode cells indicate a more efficient charge transfer and reaction process.
- Nanofiber-based LST-GDC composite anodes are a more effective material for improving the performance of solid oxide fuel cells.
