Phase-transfer interface promoted corrosion from PtNi10 nanoctahedra to Pt4Ni nanoframes  

作　　者：Yu Wang Yueguang Chen Caiyun Nan Lingling Li Dingsheng Wang Qing Peng Yadong Li 

机构地区：[1]Department of Chemistry, Tsinghua University, Beijing 100084, China

出　　处：《Nano Research》2015年第1期140-155,共16页纳米研究（英文版）

摘　　要：A novel two-phase approach towards the corrosion of PtNil0 nanoctahedra has been developed. In this strategy, the active component of Ni in oil-soluble PtNil0 nanoctahedra which resided in the upper toluene phase, suffered from etching and was then transferred into a lower aqueous phase with coordination by ethylenediaminetetraacetate （EDTA）. Due to the existence of the phase-transfer interface promoted by EDTA, the corrosion reaction proceeded at an accelerated rate under the mild conditions. Specifically, the resultant products of octahedral Pt4Ni nanoframes were successfully fabricated for the first time, and PtNi4 porous octahedra could be obtained when the dosage of EDTA-2Na was reduced. After a systematic study of this two-phase system, a ＂synergetic corrosion＂ mechanism is proposed to account for the formation of octahedral Pt4Ni nanoframes, involving contributions from many species （i.e., O2, H2O, H＋, OAm, and EDTA^4-）. As a result of the fascinating three-dimensional geometry of Pt4Ni nanoframes and PtNi4 porous octahedra, both of the corroded nanocrystals showed superior activity over the pristine PtNi^o nanoctahedra for ethanol electrooxidation in alkaline media and hydrogenation of nitrobenzene.向 PtNi 的腐蚀的一条新奇二阶段的途径 < 潜水艇 class= “ a-plus-plus ” > 10 </sub> nanoctahedra 被开发了。在这策略，在油可溶的 PtNi 的 Ni 的活跃部件 < 潜水艇 class= “ a-plus-plus ” > 居住在上面的甲苯阶段，受不了蚀刻并且是的 10 </sub> nanoctahedra 然后由 ethylenediaminetetraacetate (EDTA ) 与协作转了进一个更低的水的阶段。由于 EDTA 支持的阶段转移接口的存在，腐蚀反应在温和条件下面以加速的率继续了。明确地，八面的磅的结果的产品 < 潜水艇 class= “ a-plus-plus ” > 4 </sub > Ni nanoframes 成功地第一次被制作，并且 PtNi < 潜水艇 class= “ a-plus-plus ” > 4 </sub> 当 EDTA-2Na 的剂量被减少时，多孔的 octahedra 能被获得。在这个二阶段的系统的系统的研究以后，合作腐蚀机制被建议说明八面的磅的形成<潜水艇class=“ a-plus-plus ”> 4 </sub > Ni nanoframes ，从许多种类包含贡献(即， O <潜水艇class=“ a-plus-plus ”> 2 </sub>, H <潜水艇class=“ a-plus-plus ”> 2 </sub > O ， H <啜class=“ a-plus-plus ”>+</sup>, OAm ，和 EDTA <潜水艇class=“ a-plus-plus ”> 4 </sub>)。由于磅的迷人的三维的几何学<潜水艇class=“ a-plus-plus ”> 4 </sub > Ni nanoframes 和 PtNi <潜水艇class=“ a-plus-plus ”> 4 </sub>多孔的 octahedra ，两个在太古的 PtNi 上侵蚀的 nanocrystals 显示出优异活动<潜水艇class=“ a-plus-plus ”>为在硝基苯的碱的媒介和加氢的乙醇 electrooxidation 的 10 </sub> nanoctahedra 。

关 键 词：nanoframes porous octahedra CORROSION phase-transfer interface EDTA catalytic activity 

分 类 号：TQ655[化学工程—精细化工] TG172.33[金属学及工艺—金属表面处理]