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Effect of anodic polarization on carbon deposition on Ni/YSZ anodes exposed to methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
43012 45951 2008 7 PDF Available
Title
Effect of anodic polarization on carbon deposition on Ni/YSZ anodes exposed to methane
Abstract

The formation of carbon is a problem when operating solid-oxide fuel cells (SOFC) containing nickel/yttria-stabilized zirconia (Ni/YSZ) anodes with hydrocarbon fuels directly. Previous studies have examined the carbon formed ex-situ on Ni/YSZ anodes. In this study, we have examined the carbon formed in-situ under operating conditions, and investigated the effects of current density, time, and anode thickness on both the amount and type of carbon formed at 1073 K using temperature programmed oxidation and scanning electron microscopy. The carbon formed under operating conditions was more reactive and contained hydrogen compared to the carbon formed at open circuit potential that did not contain hydrogen. When the current density was increased less carbon was deposited, but the characteristics of the carbon did not change. With increasing time and/or anode thickness, the carbon deposits became more difficult to remove and decreased in hydrogen content.

Graphical abstractThe carbon formed under operating conditions was examined by investigating the effects of current density, time, and anode thickness on both the amount and type of carbon formed at 1073 K. Carbon deposited under operating conditions is more reactive than the carbon formed at open circuit conditions. Increasing the current density reduces carbon formation.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
SOFC; Ni/YSZ; Carbon deposition; TPO; SEM
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Effect of anodic polarization on carbon deposition on Ni/YSZ anodes exposed to methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 342, Issues 1–2, 30 June 2008, Pages 49–55
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us