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Ceramic Lithium Ion Conductor to Solve the Anode Coking Problem of Practical Solid Oxide Fuel Cells
Wei Wang1, Feng Wang1, Yubo Chen1
1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009 (P.R. China).
Chemsuschem
|May 1, 2015
Summary
This study introduces a novel anode design for solid oxide fuel cells (SOFCs) using Li(+) -conducting Li0.33 La0.56 TiO3 (LLTO) to prevent coking. The Ni/LLTO composite offers enhanced operational stability and power output for hydrocarbon fuel applications.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Coke formation on Ni-based anodes is a major limitation for solid oxide fuel cells (SOFCs) operating on hydrocarbon fuels.
- Modifying anodes with basic elements improves coking resistance but leads to element loss at high temperatures.
Purpose of the Study:
- To develop a coking-resistant and stable SOFC anode using Li(+) -conducting Li0.33 La0.56 TiO3 (LLTO).
- To address the issue of basic element loss in modified anodes by proposing a self-healing mechanism.
Main Methods:
- Fabrication of a Ni/LLTO composite anode for SOFCs.
- Evaluation of anode performance, including power output and operational stability, under hydrocarbon fuel conditions.
- Analysis of lithium diffusion and compensation mechanisms within the LLTO component.
Main Results:
- The Ni/LLTO anode demonstrated excellent power outputs and operational stability.
- Lithium loss from the anode surface was effectively compensated by diffusion from the LLTO bulk.
- The composite anode design significantly improved coking resistance.
Conclusions:
- The incorporation of Li(+) -conducting LLTO into Ni-based anodes is a practical strategy to mitigate coking in SOFCs.
- This approach offers a stable and efficient solution for hydrocarbon fuel utilization in SOFCs.
- The self-healing mechanism of lithium in the Ni/LLTO composite ensures long-term performance and durability.
