【摘要】 采用胶体法分别以乙酰丙酮铂（Pt（acac）₂）和乙酸镍（Ni（ac）₂·4H₂O）为前驱体制备了（1:3,1:1,3:1）不同摩尔比的Pt-Ni合金纳米粒子,将其负载在XC-72碳黑载体获得Pt-Ni/C双金属催化剂,其中Pt₃Ni/C催化剂催化活性最高,其正向扫描峰电流密度是42.5 m A·cm^-2,分别是Pt Ni/C、Pt Ni3/C和Pt/C催化剂的3.2、5.3和1.2倍;而催化剂抗中毒能力则是Pt Ni₃/C最强（I f/I b值为23.5）。TEM和XRD分析表明Pt-Ni双金属纳米粒子单分散性好,粒径分布为2⁴nm;同时XPS结果表明Ni的掺杂改变了Pt的外层电子层结构,减少了表面Pt原子对CO的吸附,释放出更多的Pt活性位,从而提高了Pt-Ni/C双金属催化剂的电催化活性和抗中毒能力。更多还原

【Abstract】 Pt-Ni alloy nanoparticles with different molar ratios of Pt to Ni（1:3; 1:1; 3:1） were prepared by a colloidal synthesis method with Pt（acac）₂ and Ni（ac）₂·4H₂O as precursors, and Pt-Ni/C bi-metallic catalysts were obtained after the nanoparticles were loaded on the surface of XC-72 carbon supports. Results show that the Pt₃Ni/C catalysts display the best catalytic activity. The peak current density of Pt₃Ni/C catalyst is 42.5 m A?cm^-2 at the positive scanning, which is 3.2, 5.3 and 1.2 times as high as those of Pt Ni/C, Pt Ni₃/C and Pt/C catalysts, respectively, and the anti-poisoning ability of Pt Ni₃/C is the strongest（I f/I b = 23.5）. TEM and XRD analysis indicates that Pt-Ni bi-metallic nanoparticles are uniformly distributed with the sizes ranging from 2 to 4 nm, and XPS demonstrates that the addition of Ni changes the external electronic structure of Pt, reduces the absorption of CO on Pt and releases more Pt active sites; therefore, the electrocatalytic activity and anti-poisoning ability of Pt-Ni/C catalyst are improved.更多还原