JP2017017011A - 燃料電池 - Google Patents
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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の少なくとも一方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と反対側の表面50Sから5μm以内の表面領域52を有する。表面領域52は、ペロブスカイト型酸化物によって構成される主相と、酸化ストロンチウムによって構成される第二相とを含む。表面領域52の断面における第二相の面積占有率は、0.05%以上3%以下である。
【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。
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。
空気極50は、表面領域51と内部領域52とを有する。表面領域51は、内部領域52上に配置される。表面領域51は、第1表面50Sから5μm以内の領域である。本実施形態では、燃料電池10が集電層60を備えているため、表面領域51は、空気極50のうち集電層60から5μm以内の領域である。内部領域52は、空気極50のうち表面領域51を除いた領域である。本実施形態では、燃料電池10がバリア層40を備えているため、内部領域52は、表面領域51とバリア層40の間に挟まれている。厚み方向における内部領域52の厚みは、5μm〜300μmとすることができる。
次に、図面を参照しながら、表面領域51の断面における面積占有率の算出方法について説明する。以下においては、第二相の面積占有率の算出方法について説明するが、主相及び第三相の面積占有率についても同様に算出することができる。
図2は、反射電子検出器を用いたFE−SEMによって倍率1万倍に拡大された表面領域51の断面を示す反射電子像の一例である。図2では、(La,Sr)(Co,Fe)O3を主成分として含有する空気極50の断面が示されている。図2の反射電子像は、加速電圧:1.5kV、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。表面領域51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3は、図2に示す反射電子像を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、第二相が黒色実線で囲まれて白抜きされている。
図3の解析画像において、白抜きされた第二相の合計面積を算出する。そして、反射電子像全体(気孔と固相を含む)の面積に対する第二相の合計面積の割合を算出する。このように算出される第二相の合計面積の割合が、表面領域51における第二相の面積占有率である。
表面領域51を構成する空気極材料としては、主成分としてのペロブスカイト型酸化物と副成分としてのSrOとを含む混合材料を用いることができる。SrOは、炭酸ストロンチウム、水酸化ストロンチウム又は硝酸ストロンチウムの形態で混合されていてもよい。
次に、燃料電池10の製造方法の一例について説明する。
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、サンプルNo.1〜No.12に係る燃料電池を作製した。
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処理を施した。
空気極のうち表面領域の断面上の5箇所において、上述した反射電子像の解析画像を取得し、5枚の解析画像から任意に選択した20個の第二相の平均円相当径を算出した。第二相の平均円相当径の算出結果は、表1に示す通りである。
サンプルNo.1〜No.12において、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
51 表面領域
52 内部領域
60 集電層
Claims (3)
- 燃料極と、
一般式ABO3で表され、AサイトにLa及びSrの少なくとも一方を含むペロブスカイト型酸化物を主成分として含む空気極と、
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から5μm以内の表面領域を有し、
前記表面領域は、前記ペロブスカイト型酸化物によって構成される主相と、酸化ストロンチウムによって構成される第二相とを含み、
前記表面領域の断面における前記第二相の面積占有率は、0.05%以上3%以下である、
燃料電池。 - 前記表面領域の断面における前記第二相の平均円相当径は、10nm以上500nm以下である、
請求項1に記載の燃料電池。 - 前記空気極の前記表面領域上に配置される集電層を備える、
請求項1又は2に記載の燃料電池。
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JP2019102125A (ja) * | 2017-11-28 | 2019-06-24 | 日本碍子株式会社 | 電気化学セル |
US11245118B2 (en) | 2016-07-27 | 2022-02-08 | Ngk Insulators, Ltd. | Electrochemical cell |
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WO2018021430A1 (ja) * | 2016-07-27 | 2018-02-01 | 日本碍子株式会社 | 電気化学セル |
JP6144811B1 (ja) * | 2016-11-01 | 2017-06-07 | 日本碍子株式会社 | 燃料電池 |
US10411282B2 (en) | 2016-11-01 | 2019-09-10 | Ngk Insulators, Ltd. | Fuel cell |
JP6182286B1 (ja) * | 2017-03-16 | 2017-08-16 | 日本碍子株式会社 | 燃料電池 |
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WO2013054631A1 (ja) * | 2011-10-14 | 2013-04-18 | 日本碍子株式会社 | 燃料電池セル |
JP2014129185A (ja) * | 2012-12-27 | 2014-07-10 | Kyushu Univ | セラミックスラリーおよびその製造方法ならびに固体酸化物形燃料電池 |
WO2014168071A1 (ja) * | 2013-04-12 | 2014-10-16 | 日本碍子株式会社 | 空気極材料及び燃料電池セル |
JP2015038856A (ja) * | 2013-07-19 | 2015-02-26 | 日本碍子株式会社 | 燃料電池セル及び空気極材料 |
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US11245118B2 (en) | 2016-07-27 | 2022-02-08 | Ngk Insulators, Ltd. | Electrochemical cell |
JP2019102125A (ja) * | 2017-11-28 | 2019-06-24 | 日本碍子株式会社 | 電気化学セル |
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JP5981066B1 (ja) | 2016-08-31 |
DE112016000044T5 (de) | 2017-08-17 |
US10193163B2 (en) | 2019-01-29 |
US20170062837A1 (en) | 2017-03-02 |
WO2017002598A1 (ja) | 2017-01-05 |
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