研究快淬Al70Pd17Fe13准晶在稀NaCl溶液中通过电化学脱合金化制备钠米多孔钯的过程,采用循环伏安法探讨纳米多孔钯在1 mol/L KOH溶液中对甲醇的电催化活性.XRD和TEM分析表明,准晶晶粒在脱合金化初期发生纳米分解,当脱合金化完成后转变成纳米FCC-Pd.SEM观察表明,脱合金化样品中形成迷宫状的纳米多孔结构,孔径为5~20 nm,纳米钯孔壁的晶体学取向无序,尺寸均匀,厚度约为5 nm.EDS测试结果表明,纳米钯孔壁中残留约12 at.%Al.该纳米多孔钯在碱性环境中对甲醇显示明显的电催化活性.%The formation of nanoporous Pd was studied by electro-chemical dealloying a rapidly-quenched Al70Pd17Fe13 quasicrystal alloy in dilute NaCl aqueous solution, and the electro-catalytic activity of the nanoporous Pd towards methanol electro-oxidation was evaluated by cyclic voltammetry in 1 mol/L KOH solution. XRD and TEM analyses revealed that nano-decomposition of quasicrystal grains occurred in the initial stage of dealloying, and the fully dealloyed sample was composed of FCC-Pd phase. Scanning electron microscopy observation indicated that a maze-like nanoporous pattern was formed in the dealloyed sample, consisting of percolated pores of 5-20 nm in diameter in a skeleton of randomly-orientated Pd nano-ligaments with a uniform thickness of~5 nm. A retention of~12 at.% Al in the Pd nano-ligments was determined by energy dispersive X-ray spectroscopy (EDS). The nanoporous Pd demonstrated obvious electro-catalytic activity towards methanol electro-oxidation in alkaline environment.
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