JP5199575B2 - 水電解用の貴金属酸化物触媒 - Google Patents
水電解用の貴金属酸化物触媒 Download PDFInfo
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Description
水素は、再生可能な資源に基づく未来のエネルギー体制における主要なエネルギーキャリヤーになるであろう。水の電解は、再生可能な資源を用いて水素を製造するための最も現実的な方法である。電解槽の投資及び製造コストは、系の全経済性を定義し、かつこれが水素製造のための実現可能な方法になりうるかどうかを決定するであろう。水電解による水素の製造コストは、大部分、水素の全製造コストの約70%でありうる電力消費の影響を受けている。
2H2O → O2+4H++4e− (OER)
4H+4e− → 2H2 (HER)。
GB 1 195 871には、活性化されたチタン電極における熱処理されたRuO2及びIrO2化合物及びそれらの混合物の使用が記載されている(いわゆる"DSA"(登録商標)=寸法安定性アノード)。前記製品はクロロ−アルカリ電解における塩素製造のために広く使用される。前記の酸化ルテニウム及びイリジウムは、液状前駆物質の熱分解法により電気伝導性のチタン金属基体上へ堆積される。
本発明の対象は、PEM水電解における使用に適している、低い酸素過電圧を示し、極めて低い貴金属負荷を可能にし、かつ環境的に安全な方法において製造されることができる、改善された貴金属酸化物、特に酸化イリジウム、をベースとする触媒を提供することであった。さらに、前記触媒は、長い寿命を示さなければならず、かつPEM電解槽ユニットの高い耐久性を可能にすべきである。
本発明は、酸化イリジウム及び場合により酸化ルテニウム及び高表面積の無機酸化物を含んでいる貴金属酸化物触媒に関する。RuO2が存在する場合には、Ru/Irの原子比は4/1〜1/4の範囲内、好ましくは約1/1である。
IrO2/TiO2(5質量%)の製造
二酸化チタン378.8ミリグラム(Hombifine N、Sachtleben Chemie GmbH);BET>300m2/g、20℃での水への溶解度<0.01g/l)を、激しく撹拌しながら脱イオン水112.5mlを含んでいる1リットルビーカーに添加する。次に、ヘキサクロロイリジウム酸溶液29.7グラム(H2IrCl6、Ir 24.3質量%;Umicore、Hanau/ドイツ連邦共和国)を、撹拌しながら懸濁液に添加し、脱イオン水50mlで希釈する。懸濁液をついで70℃に加熱する。前記温度に達した後、0.1M NaOH−溶液50mlを添加し、さらに脱イオン水500mlで希釈する。
IrO2/Al2O3(5質量%)の製造
アルミナ378.8ミリグラム(Puralox SCFa-140、Sasol Germany GmbH、Brunsbuettel; BET=141m2/g)を、激しく撹拌しながら脱イオン水112.5mlを含んでいる1リットルビーカーに添加する。次に、ヘキサクロロイリジウム酸溶液29.7グラム(H2IrCl6、Ir 24.27質量%;Umicore、Hanau/ドイツ連邦共和国)を懸濁液に撹拌しながら添加し、脱イオン水50mlで希釈する。懸濁液をついで70℃に加熱する。前記温度に達した後に、0.1M NaOH溶液50mlを添加し、さらに脱イオン水500mlで希釈する。
IrO2の製造(無機酸化物なし)
脱イオン水150mlを2リットルビーカー中へ注ぐ。ヘキサクロロイリジウム酸−水和物24.86グラム(Ir 38.65質量%;Umicore Hanau/ドイツ連邦共和国)を脱イオン水50ml中に溶解させる。前記溶液を、激しく撹拌しながらビーカーに添加し、脱イオン水50mlで2回希釈する。前記溶液を70℃に加熱する。前記温度に達した後に、NaOH 4グラムを脱イオン水50ml中に溶解させ、撹拌しながら前記溶液に添加する。
Claims (11)
- 酸化イリジウム及び高表面積の無機酸化物を含んでいる水電解用の触媒であって、無機酸化物が50〜400m2/gの範囲内のBET表面積を有し、かつ無機酸化物が触媒の全質量に対して20質量%未満の量で存在する、酸化イリジウム及び高表面積の無機酸化物を含んでいる水電解用の触媒。
- 4/1〜1/4の範囲内のIr/Ru−原子比で生じる量の酸化ルテニウムをさらに含んでいる、請求項1記載の触媒。
- 無機酸化物が、チタニア(TiO2)、シリカ(SiO2)、アルミナ(Al2O3)、ジルコニア(ZrO2)、二酸化スズ(SnO2)、フッ素でドープされた酸化スズ、セリア、CeO2/ZrO2、五酸化ニオブ(Nb2O5)、五酸化タンタル(Ta2O5)及び/又はそれらの組合せの群から選択されている、請求項1又は2記載の触媒。
- 無機酸化物の水への溶解度(EN ISO 787、第8部により測定される)が20℃で0.15g/l未満である、請求項1から3までのいずれか1項記載の触媒。
- 酸化イリジウムが酸化イリジウム(IV)、酸化イリジウム(III)及び/又はそれらの混合物を含んでいる、請求項1から4までのいずれか1項記載の触媒。
- 次の工程:
a)イリジウム及び場合によりルテニウム前駆物質化合物を高表面積の無機酸化物の存在で水溶液中に溶解させる工程及び
b)6〜10の範囲内で混合物のpHを調節することにより酸化イリジウム(場合により酸化ルテニウムとの組合せで)を沈殿させる工程、
c)触媒を分離し、かつ乾燥させる工程、
d)触媒を300〜800℃の範囲内の温度で熱処理する工程
を含んでいる、請求項1から5までのいずれか1項記載の触媒の製造方法。 - イリジウム前駆物質化合物が、ヘキサクロロイリジウム(IV)酸、塩化Ir(III)又は硝酸Irである、請求項6記載の方法。
- ルテニウム前駆物質化合物が、RuCl3−水和物、硝酸ニトロシルRu(III)又は酢酸Ru(III)である、請求項6記載の方法。
- PEM水電解槽のための電極、触媒−コート膜(CCMs)又は膜−電極−アセンブリ(MEAs)におけるアノード触媒としての請求項1から5までのいずれか1項記載の触媒の使用。
- 再生形燃料電池(RFC)、センサ、電解槽又は他の電気化学的デバイスにおける、請求項1から5までのいずれか1項記載の触媒の使用。
- 無機酸化物の水への溶解度が20℃で0.05g/l未満である、請求項4記載の触媒。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10350563.6 | 2003-10-29 | ||
| DE10350563 | 2003-10-29 | ||
| PCT/EP2004/012290 WO2005049199A1 (en) | 2003-10-29 | 2004-10-29 | Precious metal oxide catalyst for water electrolysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2007514520A JP2007514520A (ja) | 2007-06-07 |
| JP5199575B2 true JP5199575B2 (ja) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006537217A Expired - Lifetime JP5199575B2 (ja) | 2003-10-29 | 2004-10-29 | 水電解用の貴金属酸化物触媒 |
Country Status (11)
| Country | Link |
|---|---|
| US (2) | US7976989B2 (ja) |
| EP (1) | EP1701790B1 (ja) |
| JP (1) | JP5199575B2 (ja) |
| KR (1) | KR101082859B1 (ja) |
| CN (1) | CN1874841B (ja) |
| AT (1) | ATE442901T1 (ja) |
| CA (1) | CA2543256C (ja) |
| DE (1) | DE602004023231D1 (ja) |
| DK (1) | DK1701790T3 (ja) |
| NO (1) | NO331842B1 (ja) |
| WO (1) | WO2005049199A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10045461B1 (en) | 2014-09-30 | 2018-08-07 | Apple Inc. | Electronic device with diaphragm cooling |
| US10879538B2 (en) | 2018-02-07 | 2020-12-29 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Oxygen evolution catalyst |
| WO2023171594A1 (ja) | 2022-03-10 | 2023-09-14 | 田中貴金属工業株式会社 | 酸化イリジウム粉末からなる水電解触媒、水電解用電極膜及び触媒層付膜 |
Families Citing this family (126)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4953338B2 (ja) * | 2005-06-28 | 2012-06-13 | 独立行政法人産業技術総合研究所 | 固体高分子電解質型の水電解・燃料電池可逆セルとその酸素極 |
| PT1945576E (pt) * | 2005-10-28 | 2013-01-16 | Apr Nanotechnologies S A | Dispositivo que compreende um eléctrodo com nanorevestimento para a preparação de uma solução aquosa de estabilidade elevada e método de fabrico desta solução aquosa |
| US9401523B2 (en) * | 2007-01-09 | 2016-07-26 | GM Global Technology Operations LLC | Fuel cell and method for reducing electrode degradation during startup and shutdown cycles |
| EP1986264A1 (en) * | 2007-04-26 | 2008-10-29 | Technische Universität München | System for generating electrical energy comprising an electrochemical reformer and a fuel cell |
| EP2187469B1 (en) * | 2007-08-29 | 2017-05-10 | Showa Denko K.K. | Electrode catalyst layer, membrane electrode assembly and fuel cell |
| CN101978538B (zh) * | 2008-03-24 | 2013-09-18 | 昭和电工株式会社 | 燃料电池用催化剂的制造方法和燃料电池用催化剂 |
| WO2010025118A1 (en) * | 2008-08-25 | 2010-03-04 | 3M Innovative Properties Company | Fuel cell nanocatalyst with voltage reversal tolerance |
| US9263748B2 (en) * | 2009-01-08 | 2016-02-16 | Daimler Ag | Reversal tolerant membrane electrode assembly for a fuel cell |
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2004
- 2004-10-29 CA CA2543256A patent/CA2543256C/en not_active Expired - Lifetime
- 2004-10-29 AT AT04791049T patent/ATE442901T1/de not_active IP Right Cessation
- 2004-10-29 US US10/595,480 patent/US7976989B2/en active Active
- 2004-10-29 CN CN2004800323407A patent/CN1874841B/zh not_active Expired - Lifetime
- 2004-10-29 KR KR1020067008288A patent/KR101082859B1/ko not_active Expired - Lifetime
- 2004-10-29 DK DK04791049.2T patent/DK1701790T3/da active
- 2004-10-29 DE DE602004023231T patent/DE602004023231D1/de not_active Expired - Lifetime
- 2004-10-29 EP EP04791049A patent/EP1701790B1/en not_active Expired - Lifetime
- 2004-10-29 JP JP2006537217A patent/JP5199575B2/ja not_active Expired - Lifetime
- 2004-10-29 WO PCT/EP2004/012290 patent/WO2005049199A1/en not_active Ceased
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10045461B1 (en) | 2014-09-30 | 2018-08-07 | Apple Inc. | Electronic device with diaphragm cooling |
| US10879538B2 (en) | 2018-02-07 | 2020-12-29 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Oxygen evolution catalyst |
| WO2023171594A1 (ja) | 2022-03-10 | 2023-09-14 | 田中貴金属工業株式会社 | 酸化イリジウム粉末からなる水電解触媒、水電解用電極膜及び触媒層付膜 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101082859B1 (ko) | 2011-11-11 |
| DE602004023231D1 (de) | 2009-10-29 |
| EP1701790B1 (en) | 2009-09-16 |
| CA2543256A1 (en) | 2005-06-02 |
| CN1874841B (zh) | 2010-09-15 |
| WO2005049199A1 (en) | 2005-06-02 |
| NO331842B1 (no) | 2012-04-16 |
| NO20062368L (no) | 2006-05-24 |
| CA2543256C (en) | 2010-06-29 |
| US8263290B2 (en) | 2012-09-11 |
| DK1701790T3 (da) | 2010-01-25 |
| US20110223523A1 (en) | 2011-09-15 |
| US20070292744A1 (en) | 2007-12-20 |
| KR20060100404A (ko) | 2006-09-20 |
| US7976989B2 (en) | 2011-07-12 |
| CN1874841A (zh) | 2006-12-06 |
| JP2007514520A (ja) | 2007-06-07 |
| ATE442901T1 (de) | 2009-10-15 |
| EP1701790A1 (en) | 2006-09-20 |
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