PREPARATION OF Bi2O3-DOPED NiO/YSZ ANODE MATERIALS FOR SOFCs

Fei Li, Jingde Zhang (), Junpeng Luan, Yalei Liu and Jianxun Han
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Fei Li: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
Jingde Zhang: #x2020;Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250100, P. R. China
Junpeng Luan: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
Yalei Liu: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
Jianxun Han: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 07, 1-8

Abstract: The NiO/YSZ anode materials of SOFCs with Bi2O3 as sintering aids were successfully prepared by dry-pressing process. The effects of Bi2O3 content on the sintering properties of NiO/YSZ anode materials were studied, including the effects on the density, open porosity, weight loss, phase composition, microstructure, mechanical strength and electrical conductivity. In particular, the weight loss, relative density and bending strength of the sintered NiO/YSZ ceramics increased with the increase of Bi2O3 content while the open porosity decreased gradually. The density of the NiO–YSZ ceramics with 6wt.% Bi2O3 sintered at 1250∘C could reach that of the ceramics without Bi2O3 sintered at 1400∘C. For Bi2O3 concentration higher than 6wt.%, phase transformation of zirconia from monoclinic to cubic structure occurs, causing volume change and microcracks in the anode materials. Therefore, the optimum adding amount of Bi2O3 is 6wt.%, which can reduce the sintering temperature to 1250∘C. The ceramics with 6wt.% Bi2O3 have relatively high bending strength and low sintering temperature. This is of great significance for improving the performance of the anode and cutting the cost.

Keywords: SOFCs; NiO/YSZ anode; Bi2O3; Pore-forming agent (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500925

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