JP2021190207A - 膜電極接合体及び固体高分子型燃料電池 - Google Patents
膜電極接合体及び固体高分子型燃料電池 Download PDFInfo
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- -1 cerium ions Chemical class 0.000 claims abstract description 122
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- 230000001590 oxidative effect Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
(1)固体高分子電解質膜と、前記固体高分子電解質膜の一方の面に接合されたアノード触媒層と、前記固体高分子電解質膜の他方の面に接合されたカソード触媒層と、を有する燃料電池用の膜電極接合体であって、
セリウムイオンを含み、
中心部における前記固体高分子電解質膜の両面に触媒層を備える発電領域と、外周部における前記固体高分子電解質膜の少なくとも一方の面に触媒層がない非発電領域とを有し、
前記発電領域の面積当たりのセリウムイオンの含有量(μg−Ce/cm2)が、前記非発電領域の面積当たりのセリウムイオンの含有量(μg−Ce/cm2)よりも多い、
前記膜電極接合体。
(2)前記非発電領域のセリウムイオンの含有量(μg−Ce)と前記発電領域及び前記非発電領域のセリウムイオンの含有量(μg−Ce)の比が、下記式(I)
非発電領域のセリウムイオンの含有量(μg−Ce)/(発電領域のセリウムイオンの含有量(μg−Ce)+非発電領域のセリウムイオンの含有量(μg−Ce)) ≦ 0.28 式(I)
を満たす、(1)に記載の膜電極接合体。
(3)前記非発電領域のセリウムイオンの含有量(μg−Ce)と前記発電領域及び前記非発電領域のセリウムイオンの含有量(μg−Ce)の比が、下記式(II)
非発電領域のセリウムイオンの含有量(μg−Ce)/(発電領域のセリウムイオンの含有量(μg−Ce)+非発電領域のセリウムイオンの含有量(μg−Ce)) ≦ 0.25 式(II)
を満たす、(1)に記載の膜電極接合体。
(4)(1)〜(3)のいずれか1つに記載の膜電極接合体を備えた固体高分子型燃料電池。
(5)固体高分子電解質膜と、前記固体高分子電解質膜の一方の面に接合されたアノード触媒層と、前記固体高分子電解質膜の他方の面に接合されたカソード触媒層と、を有し、中心部における前記固体高分子電解質膜の両面に触媒層を備える発電領域と、外周部における前記固体高分子電解質膜の少なくとも一方の面に触媒層がない非発電領域とを有する燃料電池用の膜電極接合体を製造する方法であって、
触媒インクにセリウムイオンを含む溶液及び/又はセリウムを含む化合物を添加して、セリウムイオンを含む触媒インクを調製するステップ、及び
前記セリウムイオンを含む触媒インクを前記固体高分子電解質膜の少なくとも一方の面における前記発電領域のみに塗布して触媒層を形成するステップ
を含む、方法。
本明細書では、適宜図面を参照して本発明の特徴を説明する。図面では、明確化のために各部の寸法及び形状を誇張しており、実際の寸法及び形状を正確に描写してはいない。それ故、本発明の技術的範囲は、これら図面に表された各部の寸法及び形状に限定されるものではない。なお、本発明の膜電極接合体及び固体高分子型燃料電池は、下記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において、当業者がおこない得る変更、改良などを施した種々の形態にて実施することができる。
空気極(カソード):O2+4H++4e−→2H2O
水素極(アノード):2H2→4H++4e−
において触媒作用を示すものであれば限定されるものではなく、当該技術分野で公知の金属触媒を使用することができる。金属触媒としては、限定されないが、例えば、白金や白金合金、パラジウム、ロジウム、金、銀、オスミウム、イリジウムなど、又はそれらの2種以上の混合物を使用することができる。また、白金合金としては、限定されないが、例えば、白金と、アルミニウム、クロム、マンガン、鉄、コバルト、ニッケル、ガリウム、ジルコニウム、モリブデン、ルテニウム、ロジウム、パラジウム、バナジウム、タングステン、レニウム、オスミウム、イリジウム、チタン及び鉛のうちの少なくとも一種との合金などを使用することができる。
H2O2 → OHラジカル
となり、発生したOHラジカルが固体高分子電解質膜を分解劣化させてしまう。この2電子反応は、製造直後の様々なコンタミ成分(有機物を含む)を含む白金触媒上で進みやすいため、製造直後の発電初期において特に進みやすい。その後、発電を継続すると生成水によってコンタミ成分は発電系外に洗い流されるため、2電子反応により発生したOHラジカルの影響は軽微となる。
非発電領域のセリウムイオンの含有量(μg−Ce)/(発電領域のセリウムイオンの含有量(μg−Ce)+非発電領域のセリウムイオンの含有量(μg−Ce)) ≦ 0.28 式(I)
好ましくは、下記式(II)
非発電領域のセリウムイオンの含有量(μg−Ce)/(発電領域のセリウムイオンの含有量(μg−Ce)+非発電領域のセリウムイオンの含有量(μg−Ce)) ≦ 0.25 式(II)
を満たすように調整される。非発電領域セリウムイオン量比は、発電領域及び非発電領域の面積、及び成分分析、例えばICPなどにより測定された発電領域及び非発電領域の面積当たりのセリウムイオンの含有量によって算出することができる。
2:電極
3:電極
4:発電領域
5:非発電領域
Claims (5)
- 固体高分子電解質膜と、前記固体高分子電解質膜の一方の面に接合されたアノード触媒層と、前記固体高分子電解質膜の他方の面に接合されたカソード触媒層と、を有する燃料電池用の膜電極接合体であって、
セリウムイオンを含み、
中心部における前記固体高分子電解質膜の両面に触媒層を備える発電領域と、外周部における前記固体高分子電解質膜の少なくとも一方の面に触媒層がない非発電領域とを有し、
前記発電領域の面積当たりのセリウムイオンの含有量が、前記非発電領域の面積当たりのセリウムイオンの含有量よりも多い、
前記膜電極接合体。 - 前記非発電領域のセリウムイオンの含有量と前記発電領域及び前記非発電領域のセリウムイオンの含有量の比が、下記式(I)
非発電領域のセリウムイオンの含有量/(発電領域のセリウムイオンの含有量+非発電領域のセリウムイオンの含有量) ≦ 0.28 式(I)
を満たす、請求項1に記載の膜電極接合体。 - 前記非発電領域のセリウムイオンの含有量と前記発電領域及び前記非発電領域のセリウムイオンの含有量の比が、下記式(II)
非発電領域のセリウムイオンの含有量/(発電領域のセリウムイオンの含有量+非発電領域のセリウムイオンの含有量) ≦ 0.25 式(II)
を満たす、請求項1に記載の膜電極接合体。 - 請求項1〜3のいずれか一項に記載の膜電極接合体を備えた固体高分子型燃料電池。
- 固体高分子電解質膜と、前記固体高分子電解質膜の一方の面に接合されたアノード触媒層と、前記固体高分子電解質膜の他方の面に接合されたカソード触媒層と、を有し、中心部における前記固体高分子電解質膜の両面に触媒層を備える発電領域と、外周部における前記固体高分子電解質膜の少なくとも一方の面に触媒層がない非発電領域とを有する燃料電池用の膜電極接合体を製造する方法であって、
触媒インクにセリウムイオンを含む溶液及び/又はセリウムを含む化合物を添加して、セリウムイオンを含む触媒インクを調製するステップ、及び
前記セリウムイオンを含む触媒インクを前記固体高分子電解質膜の少なくとも一方の面における前記発電領域のみに塗布して触媒層を形成するステップ
を含む、方法。
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