Electrochemical deposition of Pt nanoparticles on diamond substrates
Electrochemical deposition of Pt nanoparticles on diamond substrates
复制标题
DOI：
10.1002/pssa.200982226
复制
发表时间：
2009-09
期刊：
影响因子：
--
通讯作者：
Jing-yu Hu;Xiao Lu;J. Foord;Qiang Wang
中科院分区：
文献类型：
--
作者：
Jing-yu Hu;Xiao Lu;J. Foord;Qiang Wang
用恒电位法在抛光光滑的大颗粒和小颗粒金刚石衬底上沉积了铂纳米颗粒。研究了沉积电位对BDD衬底形貌的影响。在光滑的BDD电极上观察到了沿着球形团簇的渐进形核，并伴随着铂在具有较高电化学活性的金刚石表面上的非均匀偏析，与衬底的结合较弱。相反，在生长的小颗粒和大颗粒BDD电极上观察到了瞬时形核，具有树枝状组织和更大的比活性面积。铂修饰生长的细晶BDD电极表现出比所研究的其他电极更好的电化学稳定性。
Platinum nanoparticles were deposited on polished smooth, as‐grown large grain and small grain diamond substrates by a potentiostatic method. The influence of deposition potential and the morphology of BDD substrates were studied. A progressive nucleation along with spherical clusters was observed on smooth BDD electrode, accompanied with a heterogeneous segregation of platinum on diamond facets of higher electrochemical activities and a weak binding to the substrate. In contrast, an instantaneous nucleation was observed on as‐grown small grain and large grain BDD electrodes, with a dendritic microstructure and a much larger specific active area. The platinum decorated as‐grown smaller grain BDD electrodes show a much better electrochemical stability than the other electrodes investigated.