Department of Chemical and Biomolecular Engineering, ‡Coordinated Instrumentation Facility, §Department of Chemistry, and ∥Department of Physics and Engineering Physics, Tulane University , New Orleans, Louisiana 70118, United States.
Langmuir. 2013 Oct 29;29(43):13135-9. doi: 10.1021/la4027078. Epub 2013 Oct 18.
A room-temperature electrochemical approach to synthesizing anisotropic platelike copper microcrystals and nanocrystals in the presence of potassium bromide is presented. Morphological and elemental characterization was performed using SEM, TEM, and XRD to confirm the anisotropic morphology and crystal structure of the synthesized copper particles. A possible mechanism for explaining the anisotropic crystal growth is proposed on the basis of the preferential adsorption of bromide ions to selective crystal faces. The shape-dependent electrocatalytic property of copper particles is demonstrated by its enhanced catalytic activity for methanol oxidation. Further development of such anisotropic copper particles localized on an electrode surface will lead us to find a suitable alternative for noble metal-based electrocatalysts for the methanol oxidation reaction relevant to fuel cells.
本文提出了一种在溴化钾存在下，通过室温电化学方法合成各向异性片状铜微晶体和纳米晶体的方法。通过 SEM、TEM 和 XRD 进行形貌和元素表征，以确认合成铜颗粒的各向异性形貌和晶体结构。基于溴离子优先吸附在选择性晶面上的观点，提出了一种解释各向异性晶体生长的可能机制。通过对甲醇氧化的催化活性增强，证明了铜颗粒的形状依赖性电催化性能。进一步开发这种各向异性铜颗粒在电极表面的局部化，将有助于找到一种合适的替代贵金属基电催化剂，用于与燃料电池相关的甲醇氧化反应。
