%0 Journal Article
%T <br>
%A 孙世刚
%A 赵莲花
%A 金碧瑶
%A 黄明辉
%J 物理化学学报
%D 2017
%R 10.3866/PKU.WHXB201612072
%X 采用改进的B?nnemann法成功制备了Pt/C、Pt-Ni1/3/C、Pt-SnO2/C、Pt-Nix-SnO2/C（x=1/4，1/3，2/3，1）阳极电催化剂。利用X射线衍射（XRD）、高分辨透射电子显微镜（HR-TEM）以及X射线光电子能谱（XPS）对催化剂晶型结构、表面形貌和表面电子结构进行了表征。运用线性扫描伏安（LSV）和电流密度-时间（j-t）曲线进行电化学测试，研究了乙醇电催化氧化（EOR）活性。并用原位红外光谱（in situ FT-IR）研究了EOR过程中产物的分布。结果表明，Pt-Ni1/3-SnO2/C是由Pt-Ni合金和SnO2两相组成。XPS结果表明，在Pt-SnO2中添加微量的Ni，Pt表面电子结构发生了改变。电化学结果表明，三元催化剂的EOR活性均优于二元和纯Pt，其中Pt-Ni1/3-SnO2/C的EOR活性最佳。Ni和SnO2的加入并没有显著提高乙醇C-C键的断裂能力，但是二者的协同作用在低电位（0.1 V）下加强了乙醛的进一步氧化，生成了乙酸。<br>A series of Pt/C, Pt-Ni1/3/C, Pt-SnO2/C and Pt-Nix-SnO2/C (x=1/4, 1/3, 2/3, 1) anode electro-catalysts have been synthesized by an improved B?nnemann method. The crystal structure, surface morphology and surface electronic structure were characterizated by X-ray diffraction (XRD), high resolution transmission electron microscope (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The electro-catalytic activities were characterizated by linear sweep voltammetry (LSV) and amperometric current density-time (j-t) curve techniques for ethanol oxidation reaction (EOR). In situ spectroelectrochemical studies have been used to identity adsorbed reaction intermediates and products (in situ Fourier transform infrared spectroscopy, FT-IR). XRD and HR-TEM analysis revealed two phases in the ternary Pt-Ni-SnO2/C catalyst:Pt-Ni alloys and SnO2. XPS results show that the electronic structure of the Pt in Pt-Ni1/3-SnO2/C might be changed due to the addition of Ni. The activity of Pt-Ni-SnO2/C for EOR was found to be higher than that of Pt/C, Pt-Ni/C and Pt-SnO2/C catalysts. The incorporation of Ni and SnO2 did not significantly improve C-C bond breaking for complete oxidation of ethanol, but the synergy under the low potential (0.1 V) to strengthen the further oxidation of acetaldehyde, generate the acetic acid
%U http://www.whxb.pku.edu.cn/CN/Y2017/V33/I3/563