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    • 3. 发明申请
    • MEMBRANE ELECTRODE ASSEMBLY FOR FUEL CELL
    • 用于燃料电池的膜电极组件
    • US20080299431A1
    • 2008-12-04
    • US11756997
    • 2007-06-01
    • Hanwei LeiPaolina AtanassovaRyan Cash WallRoss A. MiesemYipeng SunGordon L. Rice
    • Hanwei LeiPaolina AtanassovaRyan Cash WallRoss A. MiesemYipeng SunGordon L. Rice
    • H01M8/10
    • H01M4/8605H01M4/881H01M4/8882H01M4/8896H01M4/9016H01M4/9083H01M4/921H01M4/926H01M8/0234H01M8/1011H01M2008/1095Y02E60/523
    • A membrane electrode assembly comprises (a) a solid electrolyte polymer membrane; (b) an anode electrocatalyst layer disposed at one surface of the membrane and comprising a first electrocatalyst composition comprising carbon substrate particles and nanoparticles comprising an alloy of platinum and ruthenium disposed on the surface of the substrate particles; (c) a cathode electrocatalyst layer disposed at an opposite surface of the membrane, the cathode layer comprising a second electrocatalyst composition different from the first electrocatalyst composition and comprising carbon substrate particles and nanoparticles comprising platinum disposed on the surface of the substrate particles; and (d) gas diffusion layers disposed over each of the anode and cathode electrocatalyst layers. When operating in a direct methanol fuel cell with an active area of 25 cm2 and under conditions including a supply of 1M methanol to the anode electrocatalyst layer at a rate of 3 ml per minute, a supply of air to the cathode electrocatalyst layer at a rate of 400 sccm, the membrane electrode assembly provides an output voltage of 0.4 volt and a temperature of 70° C., provides a power output in excess of 120 mW/cm2 and a normalized performance in excess of 34 mW/mgPt.
    • 膜电极组件包括(a)固体电解质聚合物膜; (b)阳极电催化剂层,其设置在所述膜的一个表面,并且包含第一电极催化剂组合物,所述第一电催化剂组合物包含碳底物颗粒和纳米颗粒,所述纳米颗粒包含设置在所述基材颗粒表面上的铂和钌合金; (c)阴极电催化剂层,其设置在所述膜的相对表面处,所述阴极层包含不同于所述第一电催化剂组合物的第二电催化剂组合物,并且包含碳衬底颗粒和包含设置在所述衬底颗粒表面上的铂的纳米颗粒; 和(d)设置在每个阳极和阴极电催化剂层上的气体扩散层。 当在有效面积为25cm 2的直接甲醇燃料电池中并且在包括以每分钟3ml的速率向阳极电催化剂层供应1M甲醇的条件下操作时,以一定速率向阴极电催化剂层供应空气 膜电极组件提供0.4伏的输出电压和70℃的温度,提供超过120mW / cm 2的功率输出和超过34mW / mgPt的归一化性能。