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Material Analysis of Coated Siliconized Silicon Carbide (SiSiC) Honeycomb Structures for Thermochemical Hydrogen Production

Neises-von Puttkamer, Martina and Simon, Heike and Schmücker, Martin and Roeb, Martin and Sattler, Christian and Pitz-Paal, Robert (2013) Material Analysis of Coated Siliconized Silicon Carbide (SiSiC) Honeycomb Structures for Thermochemical Hydrogen Production. Materials, 6, pp. 421-436. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/ma6020421 ISSN 1996-1944

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Official URL: http://www.mdpi.com/1996-1944/6/2/421

Abstract

In the present work, thermochemical water splitting with siliconized silicon carbide (SiSiC) honeycombs coated with a zinc ferrite redox material was investigated. The small scale coated monoliths were tested in a laboratory test-rig and characterized by X-ray diffractometry (XRD) and Scanning Electron Microscopy (SEM) with corresponding micro analysis after testing in order to characterize the changes in morphology and composition. Comparison of several treated monoliths revealed the formation of various reaction products such as SiO2, zircon (ZrSiO4), iron silicide (FeSi) and hercynite (FeAl2O4) indicating the occurrence of various side reactions between the different phases of the coating as well as between the coating and the SiSiC substrate. The investigations showed that the ferrite is mainly reduced through reaction with silicon (Si), which is present in the SiSiC matrix, and silicon carbide (SiC). These results led to the formulation of a new redox mechanism for this system in which Zn-ferrite is reduced through Si forming silicon dioxide (SiO2) and through SiC forming SiO2 and carbon monoxide. A decline of hydrogen production within the first 20 cycles is suggested to be due to the growth of a silicon dioxide and zircon layer which acts as a diffusion barrier for the reacting specie.

Item URL in elib:https://elib.dlr.de/83195/
Document Type:Article
Title:Material Analysis of Coated Siliconized Silicon Carbide (SiSiC) Honeycomb Structures for Thermochemical Hydrogen Production
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neises-von Puttkamer, Martinamartina.neises (at) dlr.deUNSPECIFIED
Simon, Heikeheike.simon (at) dlr.deUNSPECIFIED
Schmücker, MartinMartin.Schmuecker (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deUNSPECIFIED
Date:February 2013
Journal or Publication Title:Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:6
DOI :10.3390/ma6020421
Page Range:pp. 421-436
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1996-1944
Status:Published
Keywords:thermochemical cycle; water splitting; mixed iron oxides; ferrite; hydrogen; silicon carbide
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:22 Jul 2013 13:30
Last Modified:21 Sep 2019 05:05

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