JP5596875B1 - 燃料電池セル及び空気極材料 - Google Patents
燃料電池セル及び空気極材料 Download PDFInfo
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Abstract
【解決手段】燃料電池セル10において、空気極14は、一般式ABO3で表され、Aサイトに少なくともSrを含むペロブスカイト型酸化物を主成分とする主相と、硫酸ストロンチウムを主成分とする第二相と、を含んでいる。空気極14の断面における第二相の面積占有率は、10.2%以下である。上記の構成は、空気極内部に発生する不活性領域を減少させるので、初期出力低下の問題を解決する。
【選択図】図1
Description
燃料電池セル(以下、「セル」と略称する。)10の構成について、図面を参照しながら説明する。図1は、セル10の構成を示す断面図である。
次に、図2〜図4を参照しながら、空気極14の断面における第二相の面積占有率の算出方法を説明する。
図2は、インレンズ二次電子検出器を用いたFE−SEM(Field Emission Scanning Electron Microscope:電界放射型走査型電子顕微鏡)によって倍率10000倍に拡大された空気極14の断面を示す画像である。図2のFE−SEM画像は、加速電圧:1kV、ワーキングディスタンス:2mmに設定されたZeiss社(ドイツ)製のFE−SEM(型式:ULTRA55)によって得られたものである。なお、空気極14の断面には、精密機械研磨後に株式会社日立ハイテクノロジーズのIM4000によってイオンミリング加工処理が予め施されている。図2では、一例として、LSCFを主相として含有する空気極14の画像が示されている。
図3は、図2に示すFE−SEM画像をMVTec社(ドイツ)製の画像解析ソフトHALCONによって画像解析した結果を示す図である。図3では、第二相が白色実線で囲まれている。
まず、図3の解析画像において、白色実線で囲まれた第二相の合計面積を算出する。
空気極14を構成する空気極材料には、一般式ABO3で表され、AサイトにSrを含むペロブスカイト型酸化物粉末とSrSO4粉末の混合材料が好適である。AサイトにSrを含むペロブスカイト型複合酸化物としては、上述の通り、LSCF、LSF、LSC、SSCなどが挙げられる。
次に、セル10の製造方法の一例について説明する。ただし、以下に述べる材料、粒径、温度、及び塗布方法等の各種条件は、適宜変更することができる。以下、「成形体」とは、焼成前の部材を指すものとする。
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。
以下のようにして、燃料極集電層を支持基板とする燃料極支持型セルのサンプルNo.1〜No.23を作製した。
まず、各サンプルの空気極を精密機械研磨した後に、株式会社日立ハイテクノロジーズのIM4000によってイオンミリング加工を施した。
次に、第二相の成分分析を行って、第二相がSrSO4を主成分としていることを確認した。
空気極を焼成して各サンプルが完成した時点において、空気極の断面を電子顕微鏡で観察することによって、微小クラックの有無を観察した。観察結果を表1にまとめて記載する。
各サンプルについて、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。
上記の耐久性試験が終了した後に、空気極の断面を電子顕微鏡で観察することによって、クラックの有無を観察した。観察結果を表1にまとめて記載する。
11 燃料極
111 燃料極集電層
112 燃料極活性層
12 固体電解質層
13 バリア層
14 空気極
Claims (4)
- 燃料極と、
一般式ABO3で表され、Aサイトに少なくともSrを含むペロブスカイト型酸化物を主成分とする主相と、硫酸ストロンチウムを主成分とする第二相と、を含む空気極と、
前記燃料極と前記空気極の間に配置される固体電解質層と、
を備え、
前記空気極の断面における前記第二相の面積占有率は、0.20%以上かつ10.2%以下である、
燃料電池セル。 - 前記断面における前記第二相の平均円相当径は、0.05μm以上2μm以下である、
請求項1に記載の燃料電池セル。 - 前記第二相の密度は、前記主相の密度よりも小さい、
請求項1又は2に記載の燃料電池セル。 - 前記ペロブスカイト型酸化物は、LSCFである、
請求項1乃至3のいずれかに記載の燃料電池セル。
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WO2017002555A1 (ja) * | 2015-06-30 | 2017-01-05 | 日本碍子株式会社 | 燃料電池 |
DE112016000042B4 (de) | 2015-06-30 | 2021-12-23 | Ngk Insulators, Ltd. | Brennstoffzelle |
WO2017002608A1 (ja) * | 2015-06-30 | 2017-01-05 | 日本碍子株式会社 | 燃料電池 |
DE112016000033T5 (de) * | 2015-07-01 | 2017-07-20 | Ngk Insulators, Ltd. | Brennstoffzelle |
WO2017002598A1 (ja) * | 2015-07-01 | 2017-01-05 | 日本碍子株式会社 | 燃料電池 |
DE112017003769T5 (de) * | 2016-07-27 | 2019-04-18 | Ngk Insulators, Ltd. | Elektrochemische Zelle |
JP6234628B1 (ja) | 2016-07-27 | 2017-11-22 | 日本碍子株式会社 | 燃料電池 |
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JP6144811B1 (ja) * | 2016-11-01 | 2017-06-07 | 日本碍子株式会社 | 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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US9876235B2 (en) | 2018-01-23 |
US20150024302A1 (en) | 2015-01-22 |
EP2830137A3 (en) | 2015-02-11 |
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