Investigations on Core-Shell Single Layered Membrane for Low-Temperature Fuel Cell(II)

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Project title

Code/計畫編號

MOST108-2221-E019-032-MY2

Translated Name/計畫中文名

低溫燃料電池核殼單層膜研究(II)

Project Coordinator/計畫主持人

Horng-Yi Chang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=13328663

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

1236千元

ResearchField/研究領域

能源工程

開發低溫操作之SOFC需整合電解質有良好氧離子導電率，陰、陽極材料在氧化還原環境下，有足夠穩定性並具有良好電催化特性。本二年計畫提出多元摻雜氧化鈰基離子電解質(LSBC)為核晶粒，電子阻隔性晶界為殼之單層膜，塗佈鈣鈦礦-Pt複合電極成單層燃料電池，以取代傳統三明治燃料電池結構。使用固態混合法(SS)與半有機溶液蒸發法(SV)製備鈰基電解質(La0.75Sr0.2Ba0.05)0.175Ce0.825O1.891 (LSBC)為核，BaZr0.1Ce0.7Y0.2O3-δ (BZCY)為殼，B2O3或LiCO3等鹽類為液相燒結助劑之核殼單層膜；Pt與Sr2Fe1.5Mo0.5O6-δ (SFM)雙鈣鈦礦為複合電極。其中LSBC-x mol%BZCY (x=0-30)，LSBC-y mol%L (L:liqid phase, x=0-40)與SFM-z mol%Pt (z=0-50)結合成電池。建立晶粒-晶界之核-殼結構，研究晶界相與晶粒間電子與離子導電相互浸透作用(percolation)，分析殼層的電子阻隔層厚度對開路電壓與漏電流影響，探討影響離子與電子導電行為之能障效應。SFM-Pt電極層做為單層膜電池之電觸媒與電流收集層，探討形成緻密及多孔電極對電觸媒與電流收集之影響。進一步分析Ce與Sr、Fe、Mo交互擴散之TPB與核殼電子阻隔層電性間之關係；期望有效開發低溫高電性效能之單層膜燃料電池。Low-temperature solid oxide fuel cells (LTSOFCs) require electrolyte with high ionic conductivity, anode and cathode with enough stability and good electrocatalytic properties under reduction-oxidation atmosphere. This two-year proposal provides multiple elements doped ceria-based electrolyte grain as a core and electron barrier grain boundary as a shell to form a single layered membrane using liquid phase sintering. Such a prepared membrane is coated with perovskite-Pt composite electrodes to become a single layered membrane fuel cell that can replace currently traditional sandwich fuel cell structure. The core-shell single layered membrane composes of the grain core (La0.75Sr0.2Ba0.05)0.175Ce0.825O1.891 (LSBC), the grain boundary shell BaZr0.1Ce0.7Y0.2O3-δ (BZCY) and B2O3 or LiCO3 salt as liquid phase sintering reagent. Pt and double perovskite Sr2Fe1.5Mo0.5O6-δ (SFM) are combined into composite electrode acting as the roles of electrocatalyzer and current collector. The prepared conditions are LSBC-x mol%BZCY (x=0-30), LSBC-y mol%L (L:liqid phase, x=0-40) and SFM-z mol%Pt (z=0-50) using solid state mixing (SS) and semi-organic solvent evaporation (SV) methods. The percolation between electrons and ions among grains and grain boundaries is analyzed in the core-shell structure to study the effect of electron barrier thickness on the open circuit voltage and leakage current. An energy barrier is expected as an effective factor on ionic and electronic conducting transportation. The electrocatalytic and current collecting efficiencies of the densified and porous composite electrodes are under investigation. Furthermore, the analyses of inter-diffusion between Ce and Sr、Fe、Mo are studied to correlate to the triple phase boundaries (TPBs) and electron barrier shell. After that, high electrical performance at low temperature operated single layered membrane fuel cell will be an achievement.

Keyword(s)

低溫燃料電池
核殼單層膜
雙鈣鈦礦電極
三相邊界
浸透作用
low-temperature solid oxide fuel cell
core-shell single layered membrane
double perovskite electrode
triple phase boundaries
percolation

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Investigations on Core-Shell Single Layered Membrane for Low-Temperature Fuel Cell(II)

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