Fabrication and Characterization of Anode-supported Solid Oxide Fuel Cell Based on Proton Conductor Electrolyte

doi:10.15541/jim20190576

Abstract

Abstract:

Proton conducting oxide BaCe_0.7Zr_0.1Y_0.2O_3-_d (BCZY7) was synthesized by high temperature solid-state reaction method, which crystal structure and microstructure morphology were characterized. The anode-supported button solid oxide fuel cell (SOFC), NiO-BCZY7/BCZY7/La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ(LSCF)-BCZY7, was fabricated by combining the dip-coating and co-sintering processes. It operated by using H₂ (containing 3vol% H₂O) as fuel and ambient air as oxidant. The maximum power density of the cell reaches 203, 123 and 92 mW×cm^-2 at 600, 550 and 500 ℃, respectively. However, traditional SOFCs based on (ZrO₂)_0.92(Y₂O₃)_0.08 electrolyte usually display only tens of milliwatts output per unit area at 600 ℃. Proton conducting electrolyte greatly improves the low and medium temperature performance of SOFCs and provides a promising solution to reduce SOFCs’ operating temperature.

Key words: proton conductor, solid oxide fuel cell, reduced temperature electrolyte, activation energy

CLC Number:

TM911

CAO Dan,ZHOU Mingyang,LIU Zhijun,YAN Xiaomin,LIU Jiang. Fabrication and Characterization of Anode-supported Solid Oxide Fuel Cell Based on Proton Conductor Electrolyte[J]. Journal of Inorganic Materials, 2020, 35(9): 1047-1052.

Figures/Tables 7

Table 1 Composition of 0.5NiO-BCZY7 electrolyte slurry

Component	BCZY7	NiO	DOP	PEG-600	TEA	Ethanol
Weight/g	5	0.025	0.30	0.30	0.36	15

Fig. 1 Photograph of cell NiO-BCZY7/BCZY7/LSCF-BCZY7

Fig. 2 (a)SEM morphology and (b)XRD pattern of BZCY7 powder synthesized by high temperature solid-state reaction method

Fig. 3 (a) Output performance and (b) comparision between theoretical and practical OCV of NiO-BCZY7/BCZY7/LSCF- BCZY7 single cell operated at different temperatures

Fig. 4 (a) Impedance plots of single cell under OCV at different temperature, (b) variation of Ohmic resistance and polarization resistance as the function of temperature, and (c) Arrhenius plot for 0.5NiO-BCZY7

Fig. 5 Cross-sectional SEM images of (a) the tested cell, the anodes (b) before and (c) after testing

Fig. 6 SEM image and EDX mappings of the particle observed in the anode surface of tested cell

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