JP6929393B2 - 膜−電極アセンブリー、その製造方法及びそれを含む燃料電池 - Google Patents
膜−電極アセンブリー、その製造方法及びそれを含む燃料電池 Download PDFInfo
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- JP6929393B2 JP6929393B2 JP2019570385A JP2019570385A JP6929393B2 JP 6929393 B2 JP6929393 B2 JP 6929393B2 JP 2019570385 A JP2019570385 A JP 2019570385A JP 2019570385 A JP2019570385 A JP 2019570385A JP 6929393 B2 JP6929393 B2 JP 6929393B2
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- membrane
- electrode assembly
- ion exchange
- nanoparticles
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Description
本発明のさらに他の目的は、前記膜−電極アセンブリーを含む燃料電池を提供することである。
図1を参照して説明すると、前記膜−電極アセンブリー100は、前記イオン交換膜50、前記イオン交換膜50の両面にそれぞれ配置される電極20、20’、及び前記イオン交換膜50と前記電極20、20’との間に位置する機能性改質層10、10’を含む。前記電極20、20’は、電極基材40、40’と、前記電極基材40、40’の表面に形成された触媒層30、30’とを含み、前記電極基材40、40’と前記触媒層30、30’との間に、前記電極基材40、40’での物質拡散を容易にするために、炭素粉末、カーボンブラックなどの導電性微細粒子を含む微細気孔層(図示せず)をさらに含めることもできる。
前記イオン交換膜の表面をプラズマ表面処理して表面活性化させることにより、前記触媒層と前記イオン交換膜間の界面接合性をもっと向上させることができ、前記プラズマ処理時に使われる物質によって多様な効果を得ることができる。
前記イオン交換膜のプラズマ処理は、プラズマ反応器内に前記反応ガスを供給してプラズマ反応器を活性化させることによって遂行することができる。前記プラズマ反応器内の圧力は0.01mTorr〜1,000mTorrであり、前記反応ガスの流量は10sccm〜1,000sccm内に維持するようにする。前記反応器内の反応ガスの流量が10sccm未満であれば表面活性化が不均一になることがあり、1,000sccmを超えれば過量の反応ガスの注入によってプラズマが発生しないこともある。
前記機能性改質層を形成する段階は、具体的にナノ粒子の表面をイオン交換基に置換させる段階、前記イオン交換基に置換されたナノ粒子と前記アイオノマーを混合して機能性改質層形成用組成物を製造する段階、及び前記機能性改質層形成用組成物を前記表面活性化したイオン交換膜の表面に塗布してから乾燥する段階を含む。
まず、触媒、アイオノマー及び溶媒を含む触媒層形成用組成物を製造した後、これを用いて前記触媒層を形成する。
図2を参照すると、前記燃料電池200は、燃料と水が混合された混合燃料を供給する燃料供給部210、前記混合燃料を改質して水素ガスを含む改質ガスを発生させる改質部220、前記改質部220から供給される水素ガスを含む改質ガスが酸化剤と電気化学的反応を引き起こして電気エネルギーを発生させるスタック230、及び酸化剤を前記改質部220及び前記スタック230に供給する酸化剤供給部240を含む。
以下では、本発明の具体的な実施例を提示する。ただ、下記に記載した実施例は本発明を具体的に例示するか説明するためのものに過ぎず、これによって本発明が制限されるものではない。また、ここに記載されていない内容は当該技術分野で熟練した者であれば充分に技術的に類推することができるので、その説明を省略する。
(比較例1)
PtCo/Cカソード(Cathode)触媒88重量%とバインダーとしてNafion(登録商標)/H2O/2−プロパノール溶液12重量%を使用し、撹拌及び超音波方法で分散させてカソード電極組成物を製造した。前記製造されたカソード電極組成物をテフロン離型フィルムにドクターブレードコーティングした後、60℃で6時間乾燥させてカソード電極を製造した。このとき、カソード電極の触媒ローディング量は約0.40mg/cm2にした。
15μm〜20μmの厚さを有するスルホン化ポリエーテルスルホン(IEC 2.3meq/g)イオン交換膜の表面を酸素ガスで洗浄した後、Arガスを用いてプラズマ反応器内で300Wで2分間プラズマ処理して表面活性化させた。
EWが700g/eqであるフッ素系アイオノマーポリ(ペルフルオロスルホン酸)(PFSA)5重量%及びH2O/2−プロパノール溶液95重量%を混合して機能性改質層形成用組成物を製造した。
15μm〜20μmの厚さを有するスルホン化ポリエーテルスルホン(IEC 2.3meq/g)イオン交換膜の表面を酸素ガスで洗浄した後、Arガスを用いてプラズマ反応器内で300Wで2分間プラズマ処理して表面活性化させた。
15μm〜20μmの厚さを有するスルホン化ポリエーテルスルホン(IEC 2.3meq/g)イオン交換膜の表面を酸素ガスで洗浄した後、Arガスを用いてプラズマ反応器内で300Wで2分間プラズマ処理して表面活性化させた。
EWが700g/eqであるフッ素系アイオノマーポリ(ペルフルオロスルホン酸)(PFSA)5重量%、平均粒径が7nmであるスルホン酸基に置換されたSiO2ナノ粒子5重量%、及びH2O/2−プロパノール溶液90重量%を混合して機能性改質層形成用組成物を製造した。
前記実施例1でスルホン酸基に置換されたSiO2ナノ粒子に代わってSiO2ナノ粒子を使ったことを除き、前記実施例1と同様に実施して膜−電極アセンブリーを製造した。
(実験例1:膜−電極アセンブリーの性能測定1)
前記比較例及び実施例で製造された膜−電極アセンブリーに対し、65℃、50%相対湿度(RH)の条件で0.6Vでの電流密度及び1.5A/cm2での電圧を測定し、その結果を下記の表1に示した。
前記比較例及び実施例で製造された膜−電極アセンブリーに対し、評価温度80℃でN2ガスをアノード(anode)とカソード(cathode)に注入し、ドライガス2分、ウェット(相対湿度(RH)150%)ガス2分の過程を繰り返して膜−電極アセンブリーに注入する。この過程が1サイクルとなる。前記過程を繰り返して耐久性評価を進め、2,000サイクルごとにイオン交換膜の劣化有無を確認するために、Linear Sweep Voltammetry(LSV)を用いてH2クロスオーバー(crossover)電流密度を90℃、0.2Vで測定した。
すなわち、前記実施例1及び実施例2では前記ナノ粒子がイオン交換基に置換されることによって微細で均一に分散されて水素イオンの移動サイト及び/又は保湿サイトを増加させることができるので、追加的な水素イオン伝導性が付与され、低加湿の条件で高分子電解質膜のイオン伝導度を一層向上させることができることが分かる。
10、10’:機能性改質層
20、20’:電極
30、30’:触媒層
40、40’:電極基材
50:イオン交換膜
200:燃料電池
210:燃料供給部
220:改質部
230:スタック
231:第1供給管
232:第2供給管
233:第1排出管
234:第2排出管
240:酸化剤供給部
Claims (18)
- イオン交換膜と、
前記イオン交換膜の両面に位置する触媒層と、
前記イオン交換膜と前記触媒層との間に位置する機能性改質層とを含み、
前記機能性改質層はアイオノマー及びナノ粒子を含み、
前記ナノ粒子は、SnO 2 、シリカ(silica)、アルミナ(alumina)、雲母(mica)、ゼオライト(zeolite)、クレイ(clay)、モンモリロナイト(momtmorillonite)、サポナイト(saponite)、ラポナイト(laponite)、フルオロヘクトライト(fluorohetorie)、カオリナイト(kaolinite)又はバーミキュライト(vermiculite)からなる第1のナノ粒子を含み、
前記第1のナノ粒子の表面は、硫酸又はクロロスルホン酸から誘導されるスルホン酸基(-SO 3 H)で置換された、
膜−電極アセンブリー。 - 前記機能性改質層は、当量(equivalent weight、EW)が800g/eq以下のアイオノマーを含む、請求項1に記載の膜−電極アセンブリー。
- 前記機能性改質層の前記アイオノマーは、フッ素系アイオノマー、又はフッ素系アイオノマーと炭化水素系アイオノマーの混合物である、請求項1に記載の膜−電極アセンブリー。
- 前記ナノ粒子は、ラジカルスカベンジャー(radical scavenger)又は酸素発生反応(oxygen evolution reaction、OER)触媒を含む第2のナノ粒子を更に含む、請求項1に記載の膜−電極アセンブリー。
- 前記ラジカルスカベンジャーは、セリウム、タングステン、ルテニウム、パラジウム、銀、ロジウム、セシウム、ジルコニウム、イットリウム、マンガン、モリブデン、鉛、バナジウム、チタン、これらのイオン形態、これらの酸化物形態、これらの塩形態及びこれらの混合物からなる群から選択されるいずれか1種である、請求項4に記載の膜−電極アセンブリー。
- 前記酸素発生反応触媒は、白金、金、パラジウム、ロジウム、イリジウム、ルテニウム、オスミウム、Pt−Pd、Pt−Sn、Pt−Mo、Pt−Cr、Pt−W、Pt−Ru、Pt−Ru−W、Pt−Ru−Mo、Pt−Ru−Rh−Ni、Pt−Ru−Sn−W、Pt−Co、Pt−Co−Ni、Pt−Co−Fe、Pt−Co−Ir、Pt−Co−S、Pt−Co−P、Pt−Fe、Pt−Fe−Ir、Pt−Fe−S、Pt−Fe−P、Pt−Au−Co、Pt−Au−Fe、Pt−Au−Ni、Pt−Ni、Pt−Ni−Ir、Pt−Cr、Pt−Cr−Ir、Ir−Fe、Ir−Ru、Ir−Os、Co−Fe、Co−Ru、Co−Os、Rh−Fe、Rh−Ru、Rh−Os、Ir−Ru−Fe、Ir−Ru−Os、Rh−Ru−Fe、Rh−Ru−Os及びこれらの混合物からなる群から選択されるいずれか1種である、請求項4に記載の膜−電極アセンブリー。
- 前記ナノ粒子は、粒径が1nm〜100nmである、請求項1に記載の膜−電極アセンブリー。
- 前記機能性改質層は、前記機能性改質層総重量に対し、前記ナノ粒子を0.1重量%〜30重量%含む、請求項1に記載の膜−電極アセンブリー。
- 前記機能性改質層の厚さは10nm〜3μmである、請求項1に記載の膜−電極アセンブリー。
- 前記機能性改質層のローディング量は0.01mg/cm2〜2.0mg/cm2である、請求項1に記載の膜−電極アセンブリー。
- 前記イオン交換膜は炭化水素系イオン伝導体を含む、請求項1に記載の膜−電極アセンブリー。
- 前記イオン交換膜は、イオン交換容量(ion exchange capacity、IEC)が1.8〜3.5meq/gであり、厚さが10μm〜25μmである、請求項1に記載の膜−電極アセンブリー。
- 前記イオン交換膜の表面はプラズマ表面処理によって表面活性化したものである、請求項1に記載の膜−電極アセンブリー。
- イオン交換膜の表面をプラズマ表面処理して表面活性化させる段階と、
前記表面活性化したイオン交換膜の表面に機能性改質層を形成する段階と、
前記機能性改質層上に触媒層を形成する段階とを含み、
前記機能性改質層は、アイオノマー及びナノ粒子を含み、
前記ナノ粒子は、SnO 2 、シリカ(silica)、アルミナ(alumina
)、雲母(mica)、ゼオライト(zeolite)、クレイ(clay)、モンモリロナイト(momtmorillonite)、サポナイト(saponite)、ラポナイト(laponite)、フルオロヘクトライト(fluorohetorie)、カオリナイト(kaolinite)又はバーミキュライト(vermiculite)を含み、
前記ナノ粒子の表面は、硫酸又はクロロスルホン酸から誘導されるスルホン酸基(-SO 3 H)で置換された、膜−電極アセンブリーの製造方法。 - 前記プラズマ表面処理は、酸素、アルゴン、ヘリウム、アンモニア、メタン、窒素、テトラフルオロメタン、フッ素系モノマー、アクリル系モノマー及びこれらの組合せからなる群から選択されるいずれか1種の反応ガスを用いて行う、請求項14記載の膜−電極
アセンブリーの製造方法。 - 前記プラズマ表面処理は、0.01mTorr〜1,000mTorrの圧力及び前記
反応ガスの流量10sccm〜1,000sccmの条件で行う、請求項15記載の膜
−電極アセンブリーの製造方法。 - 前記機能性改質層を形成する段階は、
ナノ粒子の表面を陽イオン交換基に置換させる段階と、
前記陽イオン交換基に置換されたナノ粒子と前記アイオノマーを混合して機能性改質層形成用組成物を製造する段階と、
前記機能性改質層形成用組成物を前記表面活性化したイオン交換膜の表面に塗布してから乾燥する段階とを含む、請求項14に記載の膜−電極アセンブリーの製造方法。 - 請求項1に記載の膜−電極アセンブリーを含む、燃料電池。
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JP6672622B2 (ja) * | 2015-07-07 | 2020-03-25 | 日産自動車株式会社 | 燃料電池用電極触媒層およびその製造方法、ならびに当該触媒層を用いる膜電極接合体、燃料電池および車両 |
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