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Microstructure development of the Ni-GDC anode material for IT-SOFC
Zupan, Klementina (Author), Marinšek, Marjan (Author)

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Abstract
The NiO-GDC-based material is a potential candidate for an anode material for the low-temperature SOFCs. In this work a modified combustion synthesis was used for the preparation of NiO-GDC. The main advantage of the preparation method employed was that after the synthesis both phases, NiO and GDC, in the ash product were randomly distributed on a nanometre scale. The citrate-nitrate (c/n) ratios in the combustion-reaction mixtures varied from 0.15 to 0.18. The prepared powders were isostatically pressed into pellets, sintered at 1200 °C, 1250 °C, 1300 °C, 1350 °C or 1400 °C, reduced and subsequently submitted to a microstructure analysis. The crystallite sizes of both phases in the as-prepared powders, as well as the grain sizes of nickel in the final reduced samples greatly depended on the slight variation of the c/n ratio in the starting reaction gel mixture. In the as-synthesized samples, crystallite sizes were calculated to be 4.3 nm or 40.0 nm for the GDC phase and 7.6 nm or 48.0 nm for the NiO phase for the samples with the c/n ratios of 0.15 or 0.18, respectively. After sintering under different conditions and reductions, the final average particle size of Ni varied from 71 nm to 146 nm or from 143 nm to 254 nm, while the average size of GDC grains ranged from 84 nm to 193 nm or from 96 nm to 247 nm for the samples with the c/n ratios of 0.15 or 0.18, respectively. The temperatures from 1200 °C to 1250 °C were recognized as the most appropriate temperature interval that provided good connectivity between the grains and the smallest one-phase regions in the final Ni-GDC cermets with an average Ni-particle diameter of around 70 nm.

Language:English
Keywords:combustion synthesis, nanocomposites, microstructure, fuel cells, Ni-GDC
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2012
Publisher:Inštitut za kovinske materiale in tehnologije
Number of pages:str. 445-451
Numbering:Letn. 46, št. 5
UDC:546:66.017:669.018.95
ISSN on article:1580-2949
COBISS.SI-ID:942762 Link is opened in a new window
Views:616
Downloads:156
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 This link opens in a new window

Secondary language

Language:Slovenian
Title:Razvoj mikrostrukture Ni-GDC anodnega materiala za srednjetemperaturne SOFC
Abstract:
Materiali na osnovi NiO-GDC spadajo med potencialne kandidate za izdelavo anod v srednjetemperaturnih SOFC. NiO-GDC smo pripravili z modificirano zgorevalno sintezo. Največja prednost metode je ta, da sta po sintezi obe fazi NiO in GDC naključno porazdeljeni na nanometrskem nivoju. Citratno-nitratno razmerje c/n v reakcijskih zmeseh je bilo 0,15 in 0,18. Pripravljeni prah smo po sintezi izostatsko stisnili v tablete, jih sintrali pri temperaturah 1200 °C, 1250 °C, 1300 °C, 1350 °C in 1400 °C, reducirali ter izvedli kvantitativno analizo mikrostruktur. Razmerje c/n v začetni raztopini močno vpliva na velikost kristalitov faz (NiO in GDC) v vzorcu po sintezi, kot tudi na velikost zrn faz v sintranih in reduciranih vzorcih. Najmanjša nikljeva zrna (povprečna velikost okoli 70 nm) v končnem Ni-GDC-kompozitu keramika-kovina so nastala po sintranju in kasnejši redukciji v temperaturnem intervalu med 1200 °C in 1250 °C.

Keywords:zgorevalna sinteza, nanokompoziti, mikrostruktura, gorivne celice, Ni-GDC

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