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Batteries and Fuel Cells

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...

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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

Published on: October 2, 2016

Nanotubular array solid oxide fuel cell.

Munekazu Motoyama¹, Cheng-Chieh Chao, Jihwan An

¹Department of Mechanical Engineering and ‡Department of Materials Science & Engineering, Stanford University , Stanford, California 94305, United States.

|November 26, 2013

Summary

This summary is machine-generated.

Researchers developed novel nanotubular solid oxide fuel cells (SOFCs) with enhanced surface area. These ultrathin SOFCs demonstrate promising power densities at intermediate temperatures.

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Published on: April 16, 2017

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Solid oxide fuel cells (SOFCs) are promising energy conversion devices.
Achieving high surface area and thin electrolytes is crucial for intermediate-temperature operation.
Current SOFC designs face challenges in maximizing surface area while maintaining structural integrity.

Purpose of the Study:

To demonstrate and characterize a nanotubular array of solid oxide fuel cells (SOFCs).
To introduce a fabrication methodology for high surface area, ultrathin SOFCs.
To explore the potential for increased power density in next-generation SOFCs.

Main Methods:

Fabrication of one-end-closed hollow tube Ni/yttria-stabilized zirconia/Pt membrane electrode assemblies (MEAs).
Utilizing a template process involving atomic layer deposition and electrodeposition.
Characterization of nanotubular MEAs with dimensions of ~5 μm length and <500 nm outside diameter.

Main Results:

Achieved open circuit voltages up to 660 mV (vs air) at 550 °C with H2 fuel.
Measured power densities up to 1.3 μW cm⁻² at 550 °C.
The nanotubular architecture theoretically offers a 20-fold increase in effective surface area, with potential for up to 40-fold.

Conclusions:

The developed nanotubular SOFCs represent a significant advancement for intermediate-to-low temperature operation.
The fabrication methodology enables the creation of high surface area, ultrathin SOFCs.
This approach paves the way for more efficient and compact fuel cell technologies.