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    • 1. 发明申请
    • PLATINUM/RUTHENIUM CATALYST FOR DIRECT METHANOL FUEL CELLS
    • 用于直接甲醇燃料电池的铂/钌催化剂
    • WO2006018257A3
    • 2007-04-19
    • PCT/EP2005008827
    • 2005-08-13
    • UMICORE AG & CO KGLOPEZ MARCOBIBERBACH PETER
    • LOPEZ MARCOBIBERBACH PETER
    • H01M4/92B01J23/40B01J37/03
    • H01M4/921
    • A carbon- supported PtRu anode catalyst for direct methanol fuel cells (DMFC) which has a platinum/ruthenium content in the range from 80 to 98 wt.%, preferably in the range from 85 to 98 wt.%, particularly preferably in the range from 85 to 95 wt.% (based on the total weight of the catalyst), on a carbon-based electrically conductive support material and has a mean particle size of less than 3 nm. The catalyst is prepared using a carbon black support material having a specific surface area (measured by the BET method) in the range from 1000 to 2000 m 2 /g by means of a reduction process using chemical reducing agents with addition of organic acids. Electrodes and membrane -electrode units containing the catalyst according to the invention having a high precious metal loading have an elctrode layer thickness of less than 80 urn at a PtRu loading per unit area of the elctrode of from 6 to 12 mg of PtRu/ cm 2 and lead to improved electric power in direct methanol fuel cells.
    • 用于直接甲醇燃料电池(DMFC)的碳负载PtRu阳极催化剂,其具有在80至98重量%范围内的铂/钌含量,优选在85至98重量%的范围内,特别优选在该范围内 85重量%至95重量%(基于催化剂的总重量),在碳基导电载体材料上,并且具有小于3nm的平均粒度。 使用具有比表面积(通过BET法测量)在1000-2000m 2 / g范围内的碳黑载体材料通过使用化学还原剂的还原方法制备催化剂 加入有机酸。 含有贵金属负载量高的本发明催化剂的电极和膜 - 电极单元,在每单位面积电极PtRu负载量为6〜12mg PtRu / cm 2时,电极层厚度小于80um, SUP> 2 ,导致直接甲醇燃料电池的功率提高。
    • 6. 发明专利
    • AT314141T
    • 2006-01-15
    • AT02011370
    • 2002-05-23
    • UMICORE AG & CO KG
    • RUTH KARSTEN DRBIBERBACH PETERSTARZ KARL-ANTON DRMCINTOSH RALPH
    • B01J23/46B01J23/40B01J23/42B01J37/03H01M4/86H01M4/88H01M4/92H01M8/10
    • Solutions of hexachloroplatinic acid and ruthenium chloride are added to a support material suspension. pH of the suspension is increased to 6.5-10 by adding an alkaline solution to precipitate sparingly soluble noble metal compounds. Organic carboxylic acid(s) and/or their salts are added to the suspension, and precipitated noble metal compounds are reduced to form a supported platinum-ruthenium catalyst. A support material is suspended in water to form a suspension. The suspension is heated at most up to solution boiling point. Solutions of hexachloroplatinic acid and ruthenium chloride are added to suspension while maintaining the same temperature and stirring. pH of the suspension is increased to 6.5-10 by adding an alkaline solution to precipitate hexachloroplatinic acid and ruthenium chloride in form of sparingly soluble noble metal compounds. Organic carboxylic acid(s) and/or their salts are added to the suspension, and precipitated noble metal compounds are reduced by adding reducing agents to form a supported platinum-ruthenium catalyst on a powdered support material. The catalyst is washed and dried. Independent claims are included for the following: (1) preparation of an unsupported platinum-ruthenium catalyst which involves heating solution comprising hexachloroplatinic acid and ruthenium chloride to a maximum of solutions boiling point. pH of the solution is increased to 6.5-10 by adding an alkaline solution to precipitate hexachloroplatinic acid and ruthenium chloride in form of sparingly soluble noble metal compounds, adding organic carboxylic acid(s) and/or their salts, reducing precipitated noble metal compounds by adding reducing agents to form the catalyst, washing and drying; (2) supported platinum-ruthenium catalyst; (3) unsupported platinum-ruthenium catalyst; (4) a membrane electrode assembly for fuel cells comprising the catalyst; and (5) method for using the catalyst in polymer electrolyte membrane or direct methanol fuel cells.