摘要
在15 nm金纳米粒子(Au NPs)和4-(2-羟乙基)-哌嗪乙磺酸(HEPES)混合溶液中,Pt^(2+)在金催化作用下被HEPES还原为Pt原子并沉积于Au NPs表面,常温下制备了单原子层Pt包覆Au核的核壳纳米结构(Au@Pt NPs).通过紫外可见吸收光谱(UV-Vis)、高分辨透射电镜(HRTEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)以及电感耦合等离子体-原子发射光谱(ICP-AES)等对材料的晶体结构和形貌进行了表征.电化学测试表明,表面具有单原子层铂的Au@Pt NPs对氧气还原反应表现了良好的电催化性能,在碱性溶液中其电化学活性面积(ECSA,183.40 cm^2/mgPt)和质量活性(.0.075 V下为573.2 mA/mgPt)分别为商业Pt/C催化剂(102 cm2/mgPt和113.39 mA/mgPt)的1.72和5.06倍.
We have developed for the first time an Au-catalytic-reduction strategy to synthesize the core-shell structured Au@Pt nanoparticles （NPs）. In the synthesized Au@Pt NPs, only monolayer Pt shell can be formed by the catalytic reduction of Pt^2＋in the presence of 15 nm Au NPs in HEPES buffer at room temperature. The structure and morphology of the as-prepared Au@Pt NPs were characterized by UV-visible absorption spectrum （UV-Vis）, high-resolution transmission electron microscopy （HRTEM）, X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and inductively coupled plasma-atomic emission spectrum （ICP-AES）. Electrochemical measurements displayed that the core-shell structured Au@Pt NPs with a monolayer Pt shell have good electrocatalytic performance for oxygen reduction reaction （ORR）. The specific electrochemical surface area （ECSA, 183.40 cm^2/mgpt） and mass activity （573.20 mA/mgPt at -0.075 V） of Au@Pt NPs were found to be 1.72 and 5.06 times higher than those of commercial Pt/C catalyst （102 cm2/mgPt, 113.39 mA/mgPt）, respectively.
作者
李晓坤
张友林
王晓文
陈卫
Xiaokun Li Youlin Zhang Xiaowen Wang Wei Chen(State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 China State Key Laboratory of Luminescence andApplications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China The Second Middle School ofYugan, Yugan 335100, China)
出处
《中国科学：化学》
CAS
CSCD
北大核心
2017年第5期655-662,共8页
SCIENTIA SINICA Chimica
基金
国家自然科学基金(编号:21405149,21575134,21633008,21275136)
国家重点基础研究发展计划(编号:2016YFA0203200)资助项目
关键词
金催化-还原
电催化剂
单原子层
核壳结构
氧还原反应
Au-catalytic-reduction, electrocatalyst, atomic monlayer, core-shell nanostructure, oxygen reductionreaction
