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    • 3. 发明公开
    • PRODUCTION METHOD FOR ELECTRODE CATALYST, ELECTRODE CATALYST, COMPOSITION FOR FORMING GAS DIFFUSION ELECTRODE, GAS DIFFUSION ELECTRODE, MEMBRANE-ELECTRODE ASSEMBLY (MEA), AND FUEL CELL STACK
    • 电极催化剂的生产方法,电极催化剂,形成气体扩散电极的组合物,气体扩散电极,膜电极组件(MEA)和燃料电池堆
    • EP3035424A1
    • 2016-06-22
    • EP15769321.9
    • 2015-03-27
    • N.E. Chemcat Corporation
    • NAKAMURA, YokoNAGAMORI, KiyotakaMIZUSAKI, TomoteruTSUBAKI, Takuya
    • H01M4/88H01M4/86H01M4/90H01M4/92H01M8/02H01M8/10
    • H01M4/8657H01M4/86H01M4/8825H01M4/8842H01M4/90H01M4/92H01M4/921H01M4/926H01M8/02H01M2008/1095Y02P70/56
    • Provided is a production method of an electrode catalyst that can reduce the content of chlorine species reliably and sufficiently through a simple operation, even when using an electrode catalyst precursor containing a high concentration of chlorine (Cl) species as a raw material of the electrode catalyst. The production method of the electrode catalyst has a core-shell structure including a core part formed on a support and a shell part formed to cover at least a part of a surface of the core part. The production method includes a first step (1) of preparing a first liquid with an electrode catalyst precursor (I) being dispersed in ultrapure water by adding the electrode catalyst precursor (I) to the ultrapure water, the electrode catalyst precursor (I) being produced using a material containing chlorine (Cl) species, and exhibiting a chlorine (Cl) species concentration not lower than a first chlorine (Cl) species concentration when measured by X-ray fluorescence (XRF) spectroscopy; and a second step (2) of preparing a second liquid by dispersing an electrode catalyst precursor (II), the electrode catalyst precursor (II) being obtained by filtrating and washing the electrode catalyst precursor (I) contained in the first liquid with ultrapure water , and then performing washing until an electric conductivity p of a filtrate has become a first value or lower.
    • 本发明提供一种电极催化剂的制造方法,即使使用含有高浓度的氯(Cl)物质的电极催化剂前体作为电极催化剂的原料,也能够通过简单的操作可靠且充分地降低氯物种的含量 。 电极催化剂的制造方法具有核壳结构,该核壳结构包括形成在支撑体上的核部分和形成为覆盖核核部分的至少一部分表面的壳部分。 该制造方法包括:第一工序(1),通过在超纯水中添加电极催化剂前体(I),使电极催化剂前体(I)分散于超纯水中而制备第一液体,电极催化剂前体(I)为 (X)荧光(XRF)光谱法测量时,使用含有氯(Cl)物质的材料制备,并且具有不低于第一氯(Cl)物质浓度的氯(Cl)物质浓度; 和通过分散电极催化剂前体(II)制备第二液体的第二步骤(2),所述电极催化剂前体(II)通过用超纯水过滤并清洗包含在第一液体中的电极催化剂前体(I) ,然后进行洗涤直至滤液的电导率p变为第一值或更低。