JP4901313B2 - 膜電極接合体、膜電極接合体の製造方法、および燃料電池 - Google Patents
膜電極接合体、膜電極接合体の製造方法、および燃料電池 Download PDFInfo
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Description
アノード拡散層単位体は、アノード基材上に、炭素粉末とバインダーと分散媒との混合物を、塗布および焼結させることによって製造される。
アノード触媒コーティング膜は、転写フィルム上に、担持触媒と伝導性物質と分散媒との混合物を、塗布および乾燥させた後、これを電解質膜に転写させることによって製造される。
カソード拡散層単位体は、カソード基材上に、炭素粉末とバインダーと分散媒との混合物を、塗布および焼結させることによって製造され、疎水性を表すために20〜50質量%のポリテトラフルオロエチレンを含むことが望ましいという点を除いては、上記アノード拡散層単位体と同じ要領によって製造されうる。
カソード電極単位体は、転写フィルムでない、カソード拡散層単位体上に、直接担持触媒と伝導性物質と分散媒との混合物を、塗布および乾燥させるという点を除いては、上記アノード触媒コーティング膜の製造工程中のアノード電極単位体と同じ要領によって製造されうる。
最終的に、上記製造されたアノード触媒コーティング膜およびカソード電極単位体を、ホットプレス工程によって接合させることによって、本発明によるMEAが製造されうる。
カーボンブラック粉末を、ポリテトラフルオロエチレンおよびイソプロピルアルコールと100:5:500の質量比で混合して、超音波槽で2時間混合してアノード拡散層スラリを製造した後、これを厚さ400nmの炭素紙(GDL10シリーズ、SGL carbon group)上に塗布し、170℃の温度で1時間焼結させてアノード拡散層単位体を製造した。
カーボンブラック粉末を、ポリテトラフルオロエチレンおよびイソプロピルアルコールと100:20:500の質量比で混合して超音波槽で2時間混合してカソード拡散層スラリを製造した後、これを厚さ400nmの炭素紙(GDL10シリーズ、SGL carbon group)上に塗布し、350℃の温度で1時間焼結させてカソード拡散層単位体を製造した。
カーボンブラック粉末を、ポリテトラフルオロエチレンおよびイソプロピルアルコールと100:5:500の質量比で混合して超音波槽で2時間混合してアノード拡散層スラリを製造した後、これを厚さ400nmの炭素紙(GDL10シリーズ、SGL carbon group)上に塗布し、350℃の温度で1時間焼結させてアノード拡散層単位体を製造した。
実施例1、比較例1および比較例2に係るMEAを含む単位電池を、当業界に公知の通常的な方法を使用してそれぞれ3つずつ製造し、製造された単位電池の電力密度および時間による電流密度の変化を測定した。図6は、本発明の実施例1に係るMEAを使用した単位電池と、比較例1と比較例2とに係るMEAを使用した単位電池との電力密度を示す説明図であり、また、図7は、本発明の実施例1に係るMEAを使用した単位電池と、比較例1と比較例2とに係るMEAを使用した単位電池との、時間による電流密度の変化を示す説明図である。
12、22 炭素基材
14、24 拡散層
16、26 触媒層
20 カソード
50 電解質膜
Claims (10)
- アノード基材、アノード拡散層、および細孔を有するアノード触媒層を備えるアノードと;
カソード基材、カソード拡散層、および細孔を有するカソード触媒層を備えるカソードと;
前記カソードとアノードとの間に位置する電解質膜と;
を備える、メタノール型燃料電池用の膜電極接合体であって:
前記アノード拡散層は、親水性を示し、前記カソード拡散層は、疎水性を示し、前記アノード触媒層の平均細孔直径が、前記カソード触媒層の平均細孔直径より小さく、
前記アノード触媒層としてのアノード触媒コーティング膜は、転写フィルム上に、担持触媒と伝導性物質と分散媒との混合物を、塗布および乾燥させた後、前記塗布および乾燥させた混合物を電解質膜に転写して製造され、
前記アノード触媒コーティング膜を製造する工程の転写は、100〜140℃の温度、0.5〜5トン/cm 2 の圧力で、5分〜10分間ホットプレス工程によって行われることを特徴とする、膜電極接合体。 - 前記アノード拡散層は、5〜20質量%のポリテトラフルオロエチレンを含むことを特徴とする、請求項1に記載の膜電極接合体。
- 前記カソード拡散層は、20〜50質量%のポリテトラフルオロエチレンを含むことを特徴とする、請求項1に記載の膜電極接合体。
- 前記アノード触媒層の質量当たり表面積は、15〜25m2/gであることを特徴とする、請求項1に記載の膜電極接合体。
- 前記カソード触媒層の質量当たり表面積は、2〜10m2/gであることを特徴とする、請求項1に記載の膜電極接合体。
- アノード基材上に、炭素粉末とバインダーと分散媒との混合物を、塗布および焼結させてアノード拡散層単位体を製造する工程と;
転写フィルム上に、担持触媒と伝導性物質と分散媒との混合物を、塗布および乾燥させた後、前記塗布および乾燥させた混合物を電解質膜に転写してアノード触媒コーティング膜を製造する工程と;
カソード基材上に、炭素粉末とバインダーと分散媒との混合物を、塗布および焼結させてカソード拡散層単位体を製造する工程と;
前記カソード拡散層単位体上に、担持触媒と伝導性物質と分散媒との混合物を、塗布および乾燥させて、カソード電極の単位体を製造する工程と;
前記アノード触媒コーティング膜および前記カソード電極の単位体をホットプレス工程によって、前記アノード触媒コーティング膜および前記カソード電極の単位体を接合する工程と;
を含み、
前記アノード触媒コーティング膜を製造する工程の転写は、100〜140℃の温度、0.5〜5トン/cm2の圧力で、5分〜10分間ホットプレス工程によって行われることを特徴とする、膜電極接合体の製造方法。 - 前記アノード拡散層単位体は、5〜20質量%のポリテトラフルオロエチレンを含むことを特徴とする、請求項6に記載の膜電極接合体の製造方法。
- 前記カソード拡散層単位体は、20〜50質量%のポリテトラフルオロエチレンを含むことを特徴とする、請求項6に記載の膜電極接合体の製造方法。
- 前記ホットプレス工程は、100〜140℃の温度、0.5〜2トン/cm2の圧力で、5分〜10分間行われることを特徴とする、請求項6に記載の膜電極接合体の製造方法。
- 請求項1〜5のうち何れか1項に記載の膜電極接合体を含むことを特徴とする、燃料電池。
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KR1020060011833A KR100659132B1 (ko) | 2006-02-07 | 2006-02-07 | 연료전지용 막전극 접합체, 그 제조방법 및 이를 채용한연료전지 |
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JP5298412B2 (ja) * | 2006-08-24 | 2013-09-25 | トヨタ自動車株式会社 | 燃料電池 |
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US20090104476A1 (en) * | 2007-10-17 | 2009-04-23 | Gm Global Technology Operations, Inc. | Fuel cell stack with asymmetric diffusion media on anode and cathode |
US8940460B2 (en) * | 2011-02-14 | 2015-01-27 | Nissan North America, Inc. | Catalyst ink preparation for fuel cell electrode fabrication |
CA2831700C (en) * | 2011-03-29 | 2020-02-18 | Council Of Scientific & Industrial Research | An improved process for the preparation of membrane electrode assemblies (meas) |
WO2014014463A1 (en) * | 2012-07-19 | 2014-01-23 | Utc Power Corporation | Microporous layer with hydrophilic additives |
KR20150135384A (ko) * | 2013-03-22 | 2015-12-02 | 도판 인사츠 가부시키가이샤 | 촉매 전사 필름용 기재 필름 및 그 제조 방법, 촉매 전사 필름의 제조 방법, 촉매층을 구비한 전해질막 |
CN104835974B (zh) * | 2015-05-07 | 2017-08-25 | 昆山弗尔赛能源有限公司 | 燃料电池双极板压合机 |
JP6620467B2 (ja) * | 2015-08-31 | 2019-12-18 | 凸版印刷株式会社 | 固体高分子形燃料電池の製造方法 |
CN110247089A (zh) * | 2019-07-10 | 2019-09-17 | 浙江博氢新能源有限公司 | 低Pt载量膜电极及其制备方法 |
GB201914335D0 (en) * | 2019-10-04 | 2019-11-20 | Johnson Matthey Fuel Cells Ltd | Membrane electrode assembly |
CN110890554B (zh) * | 2019-11-29 | 2022-06-03 | 扬州大学 | 大功率柔性单酶葡萄糖燃料电池及其制备方法 |
JP7287347B2 (ja) * | 2020-05-22 | 2023-06-06 | トヨタ自動車株式会社 | 燃料電池用の積層体 |
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