通过共沉淀法合成了一系列模型微分散Ni 1- x Pt x合金(x = 0-0.05),随后在800°C的H 2气氛中烧结沉淀。确定了它们的化学和相组成(分别通过AAS和XRD分析),发现所提出的合成方法可提供基于面心镍晶格的Ni-Pt固溶体。Ni 1– x Pt x的碳侵蚀的动力学特征 研究了它们在550-700°C的温度下与1,2-二氯乙烷蒸气接触的合金。已经发现,不管Pt的浓度如何,合金中Pt的存在都会使碳产物的积累速率提高约1.5倍。催化剂在5小时的反应过程中未发生失活,以确保碳材料的高收率(103 g / g cat)。利用电子显微镜(SEM和TEM技术),发现碳产品由具有分段结构的碳纤维组成。合金中Pt浓度增加到4.3 wt%会急剧改变合金的崩解,从而形成具有双峰纤维直径分布(d av = 0.4和1.2μm)的碳产物。
of the diffuse intensity at the 100 position for the x=0.25 alloy is rod-like, but the shape is nearly spherical for the x=0.50 alloy. The X-ray diffuse scattering intensities were measured from the x=0.50 single-crystal alloy at room temperature, and the Warren-Cowley short-rangeorder parameters were determined after analysing the data. The correlation length has been deduced to be about 19 AA from
Amorphous PtNiP particle networks of different particle sizes for the electro-oxidation of hydrazine
作者:Yuanyuan Ma、Hui Wang、Weizhong Lv、Shan Ji、Bruno G. Pollet、Shunxi Li、Rongfang Wang
DOI:10.1039/c5ra13774h
日期:——
Amorphous PtNiP particle networks with different particle sizes prepared via the reaction temperature control method showed high catalytic activity for hydrazine oxidation compared to the Pt and PtNi catalysts due to its porous, amorphous structure.
Oxygen Reduction Activity of Dealloyed Pt1–xNix Catalysts
作者:Gary Chih-Kang Liu、D. A. Stevens、J. C. Burns、R. J. Sanderson、George Vernstrom、R. T. Atanasoski、M. K. Debe、J. R. Dahn
DOI:10.1149/1.3595749
日期:——
and intermixed Pt 1-x Ni x (0.65 < x < 0.75) catalysts were sputtered-deposited onto both bare and nanostructured thin film (NSTF)-coated glassy carbon disks. The oxygenreduction reaction (ORR) activities of the disks were determined from Rotating Disk Electrode (RDE) measurements. Experiments on the NTSF-coated disks examined both catalytic activities and the effects of high surface area supports
Pt 和混合 Pt 1-x Ni x (0.65 < x < 0.75) 催化剂被溅射沉积到裸露和纳米结构薄膜 (NSTF) 涂层的玻璃碳盘上。圆盘的氧还原反应 (ORR) 活性由旋转圆盘电极 (RDE) 测量确定。在 NTSF 涂层圆盘上的实验在一次测量中检查了催化活性和高表面积载体的影响。RDE 测量协议旨在检查脱合金过程中催化剂特性和性能的变化,因此在开始时不包括典型的“电化学清洁”程序。反而,连续 CV-ORR 测量方案用于监测电化学性能指标,例如 9 小时内催化剂的活性表面积 (SEF) 和 ORR 动电流密度。例如,NSTF 支撑上 Pt 25 Ni 75 的 SEF 最初为 20 cm 2 P t /cm 2 平面,SEF 在实验开始时迅速增加,然后稳定在~50 cm 2 /cm 2 附近,如镍脱合金。这与显示 SEF ~15 cm 2 /cm 2 的 NSTF 载体上的溅射
Studies of Transition Metal Dissolution from Combinatorially Sputtered, Nanostructured Pt[sub 1−x]M[sub x] (M = Fe, Ni; 0<x<1) Electrocatalysts for PEM Fuel Cells
作者:A. Bonakdarpour、J. Wenzel、D. A. Stevens、S. Sheng、T. L. Monchesky、R. Löbel、R. T. Atanasoski、A. K. Schmoeckel、G. D. Vernstrom、M. K. Debe、J. R. Dahn
DOI:10.1149/1.1828971
日期:——
The dissolution of Fe and NifromPt 1 - xMx (M = Fe, Ni; 0 0.6, the lattice constant expands indicating that transitionmetals dissolve also from the bulk. X-ray photoelectron spectroscopy results show complete removal of surface Ni (Fe) after acid treatment at 80°C for all compositions. The results of the acid treatments compare well to the composition changes that occur when a Pt 1 - xFex or
Fe 和 Ni 从 Pt 溶解 1 - x M x (M = Fe, Ni; 0 0.6, 晶格常数扩大表明过渡金属也从体中溶解。X 射线光电子能谱结果显示表面 Ni ( Fe) 在 80°C 下对所有组合物进行酸处理后。酸处理的结果与在操作中使用 Pt 1 - x Fe x 或 Pt 1 - x Ni x 组合催化剂库时发生的成分变化相当PEM 燃料电池。
Double complex salts of Pt and Pd ammines with Zn and Ni oxalates – promising precursors of nanosized alloys