期刊
CHEMISTRY OF MATERIALS
卷 23, 期 5, 页码 1136-1146出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm1024876
关键词
intermetallic; nanomaterials; PtNi; fuel cell; electrocatalyst; formic acid oxidation
资金
- Basic Energy Sciences Division of the Department of Energy
- NSF [DMR-0520404]
In this paper, a nonaqueous synthesis of PtNi nanoparticles is presented using multiple reducing agents and metal precursors. Through this investigation, it was found that all the species present in solution have an impact on the resulting nanoparticles. Metal precursor choice has a major effect on the resulting nanoparticles and their behavior. When using acetylacetonate (acac) precursors, the acac ligands bind tightly with the resulting metal particles and cannot be easily removed through washing. After annealing to nucleate the intermetallic phase, these ligands decompose into a carbonaceous coating rendering the particles inactive toward formic acid oxidation. This led to the development of a chloride precursor Li2NiCl4, not previously used for synthesis of inorganic nanoparticles, which is soluble in ether solvents unlike NiCl2 and many other metal chlorides. Using the lithium metal chloride as a precursor, the organic content of the nanoparticle products is greatly reduced as seen by lower weight losses in TGA, TEM imaging, lower intermetallic formation temperatures, and greatly enhanced catalytic activity for formic acid oxidation. Additionally, by changing the alkali metal of an alkali metal alkylborohydride reducing agent and thus the resulting salt byproduct, the particle size of the resulting intermetallic nanoparticles can be controlled. These new LixMCly precursors and synthesis techniques have opened the door to the synthesis of a broad range of intermetallic Pt-M nanoparticles and will allow their study as electrocatalysts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据