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Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells

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Layered LiCoO_2-LiFeO₂ Heterostructure Composite for Semiconductor-Based Fuel Cells.

Yanyan Liu¹, Chen Xia², Baoyuan Wang²

¹Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 064004, China.

Nanomaterials (Basel, Switzerland)

|June 2, 2021

Summary

A novel LiCoO2-LiFeO2 composite enhances ionic conductivity for low-temperature solid oxide fuel cells (LT-SOFCs). Semiconductor-based fuel cells (SBFCs) utilizing this material achieved a power density of 714 mW cm-2, significantly outperforming conventional SOFCs.

Keywords:

LiCoO2–LiFeO2 heterostructure composite high performance semiconductor-based fuel cell

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Area of Science:

Materials Science
Electrochemistry
Energy Conversion

Background:

Fast ionic transport is crucial for low-temperature solid oxide fuel cells (LT-SOFCs) operating between 400-600 °C.
Layered oxides offer potential for improved performance in electrochemical devices.

Purpose of the Study:

To explore a layer-structured LiCoO2-LiFeO2 heterostructure composite for LT-SOFC applications.
To investigate the multifunctional properties of this composite as both a cathode and a semiconductor membrane layer.
To enhance ionic conductivity using a composite with Sm3+ doped ceria (SDC) electrolyte.

Main Methods:

Fabrication of fuel cell devices with different configurations (conventional SOFCs and semiconductor-based fuel cells - SBFCs).
Utilizing LiCoO2-LiFeO2 composite as a cathode in SOFCs.
Employing LiCoO2-LiFeO2 composite as a semiconductor membrane layer in SBFCs, combined with SDC electrolyte.

Main Results:

The LiCoO2-LiFeO2 composite demonstrated multifunctional properties in various fuel cell configurations.
Enhanced ionic conductivity was achieved in SBFCs with the LiCoO2-LiFeO2 and SDC electrolyte composite.
SBFC devices exhibited high open-circuit voltages (OCVs) and promising cell performance.
A significantly improved power density of 714 mW cm-2 was achieved in the SBFC device at 550 °C.

Conclusions:

The LiCoO2-LiFeO2 heterostructure composite shows great promise for developing high-performance LT-SOFCs.
The SBFC configuration with the composite material offers a substantial advancement over conventional SOFC designs.
Multifunctional layered oxides are key to advancing low-temperature fuel cell technology.