JP2017147234A - 燃料電池 - Google Patents
燃料電池 Download PDFInfo
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Abstract
【解決手段】燃料電池10は、燃料極20と、空気極50と、燃料極20および空気極50の間に配置される固体電解質層30とを備える。空気極50は、一般式ABO3で表され、AサイトにLa及びSrを含むペロブスカイト型酸化物を主成分として含有する。空気極50は、固体電解質層30と反対側の第1表面50Sを有する。第1表面50SにおけるX線光電子分光分析で検出されるLa濃度に対するSr濃度の第1の比R1は、第1表面50Sに表面処理を施して露出した露出面51SにおけるX線光電子分光分析で検出されるLa濃度に対するSr濃度の第2の比R2の4倍以下である。露出面51Sは、厚み方向において第1表面50Sから5nm内部に位置する。
【選択図】図3
Description
燃料電池10の構成について、図面を参照しながら説明する。燃料電池10は、いわゆる固体酸化物型燃料電池(SOFC:Solid Oxide Fuel Cell)である。燃料電池10は、縦縞型、横縞型、燃料極支持型、電解質平板型、或いは円筒型などの形態を取りうる。
空気極50の微構造について、図面を参照しながら説明する。図2は、空気極50の断面を模式的に示す図である。
次に、燃料電池10の製造方法の一例について説明する。
また、空気極50を焼成した後、降温中も酸素濃度の高い焼成雰囲気を維持することが好ましい。具体的には、純酸素雰囲気又は酸素濃度が40%以上の酸素リッチ空気雰囲気で空気極50の焼成体を常温まで降温させることによって、第1表面50Sにおける第1の比R1の露出面51Sにおける第2の比R2に対する比を微調整することができる。
本発明は以上のような実施形態に限定されるものではなく、本発明の範囲を逸脱しない範囲で種々の変形又は変更が可能である。
Lam(Ni1−x−yFexCuy)nO3−δ・・・(1)
組成式(1)のAサイトにはLa以外の物質が含まれていてもよく、BサイトにはNi、Fe及びCu以外の物質が含まれていてもよい。組成式(1)において、m及びnは0.95以上1.05以下であり、x(Fe)は0.03以上0.3以下であり、y(Cu)は0.05以上0.5以下であり、δは0以上0.8以下である。
以下のようにして、サンプルNo.1〜No.10に係る燃料電池を作製した。
各サンプル10個ずつについて、空気極の外表面を顕微鏡及び目視で観察することによって、外表面におけるクラックの有無を確認した。確認結果を表1に示す。
まず、X線光電子分光分析(Physical Electronics Inc.社製、型式ESCA−5700ci、X線源:MgKα(400W、1254.6eV)、分析径:800μmφ、X線と試料との角度:45°、X線と分光器との角度:54.7°)によって空気極の最表面上の任意の5箇所におけるLa濃度とSr濃度を検出し、La濃度に対するSr濃度の第1の比R1(5箇所における比の算術平均値)を算出した。
サンプルNo.1〜No.10について、燃料極側に窒素ガス、空気極側に空気を供給しながら750℃まで昇温し、750℃に達した時点で燃料極に水素ガスを供給しながら還元処理を3時間行った。
20 燃料極
30 固体電解質層
40 バリア層
50 空気極
50S 第1表面
51 空気極粒子
51S 露出面
Claims (2)
- 燃料極と、
一般式ABO3で表され、AサイトにLa及びSrを含むペロブスカイト型酸化物を主成分として含有する空気極と、
前記燃料極および前記空気極の間に配置される固体電解質層と、
を備え、
前記空気極は、前記固体電解質層と反対側の表面を有し、
前記空気極の前記表面におけるX線光電子分光分析で検出されるLa濃度に対するSr濃度の第1の比は、前記表面に表面処理を施して露出した露出面におけるX線光電子分光分析で検出されるLa濃度に対するSr濃度の第2の比の1倍以上4倍以下であり、
前記露出面は、厚み方向において前記表面から5nm内部に位置する、
燃料電池。 - 前記ペロブスカイト型酸化物のAサイトにおけるBa、Ca、Na及びKの総量は、2000ppm以下である、
請求項1に記載の燃料電池。
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US11024856B2 (en) * | 2016-08-08 | 2021-06-01 | Morimura Sofc Technology Co., Ltd. | Electrochemical reaction single cell having cathode including cerium oxide and strontium sulfate and electrochemical reaction cell stack including the same |
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US11894565B2 (en) | 2018-09-27 | 2024-02-06 | Sakai Chemical Industry Co., Ltd. | Powder for solid oxide fuel cell air electrode and method of manufacturing same |
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