氧化鎳助燒結技術應用於薄膜電解質固態氧化物燃料電池;NiO-assisted sintering of thin-film BaCe0.6Zr0.2Y0.2O3-δ electrolyte for proton–conducting solid oxide fuel cells

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Title:	氧化鎳助燒結技術應用於薄膜電解質固態氧化物燃料電池;NiO-assisted sintering of thin-film BaCe0.6Zr0.2Y0.2O3-δ electrolyte for proton–conducting solid oxide fuel cells
Authors:	陳廷嘉;Chen, Ting-Chia
Contributors:	材料科學與工程研究所
Keywords:	助燒結劑;固態氧化物燃料電池;電解質;旋轉塗佈;SOFC;sintering agent;proton-conducting;spin coating
Date:	2018-07-30
Issue Date:	2018-08-31 13:11:40 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究以固相反應法合成質子傳導氧化物BaCe0.6Zr0.2Y0.2O3-δ (BCZY)電解質粉末，並將BCZY配置成電解質懸浮液以旋轉塗佈技術製備電解質薄膜，並探討添加助燒結劑於薄膜化電解質之影響。當添加3 wt% NiO至BCZY中，晶粒適當的成長且有效提升電解質燒結性質，使得電解質層數可從三層減少至兩層，進而縮短離子傳輸距離，且避免連通孔洞所造成之漏氣狀況。將添加NiO之兩層BCZY與三層BCZY之電池相比，於800 ℃下，最高功率密度可由61 mW/cm2提升至101 mW/cm2，除了有效減少質子傳輸之阻礙，由於電解質結構更為緻密使得電解質與陰、陽極有效反應面積將有所提升，於800 ℃下，總阻抗由5.81 Ωcm2降低至4.13 Ωcm2。於固相反應法中添加助燒結劑NiO，相較於溶膠-凝膠法、燃燒法等濕化學合成方法，其材料成本較低、製程方便且保持良好質子傳導性，因此更能實際應用於固態氧化物燃料電池之製程中。;Small amounts of sintering agent NiO added to the calcined BCZY powders are known to promote the grain growth and to accelerate the densification of the NiO-modified BCZY at relatively low temperature. The purpose of this study is to investigate the effect of sintering agent NiO on the performance of proton-conducting SOFC single cell. Proton-conducting oxide (BaCe0.6Zr0.2Y0.2O3-δ, BCZY) powders were synthesized by solid-state reaction method. The electrolyte suspension was prepared by mixing 0-10 wt% with BCZY electrolyte powder and binder PVP in pure ethanol. The uniform suspension was spread onto NiO-BCZY composite anode support by spin coating. A thin, dense and crack free BCZY electrolyte film was successfully obtained after sintering at 1500 ℃. Single cells comprising of LSCF/BCZY(0-10 wt% NiO)/NiO-BCZY were then fabricated and tested for their electrochemical performance at 550-800 ℃. The results showed that cell performance was improved by addition of NiO to enhance the electrolyte sinterability in cells with reduced electrolyte layers. The maximum power density was increased from 61 mW/cm2 to 101 mW/cm2 at 800 ℃. The result of EIS measurement indicates that the addition of NiO can reduce ohmic resistance as well as polarization resistance for the cell, resulting in the improved cell performance.
Appears in Collections:	[Institute of Materials Science and Engineering] Electronic Thesis & Dissertation

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