Supported PtAu catalysts with different nano-structures for ethanol electrooxidation
Supported PtAu catalysts with different nano-structures for ethanol electrooxidation
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DOI：
10.1016/j.electacta.2013.12.153
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发表时间：
2014-03
影响因子：
6.6
通讯作者：
Weijiang Zhou;M. Li;Lan Zhang;S. Chan
中科院分区：
文献类型：
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作者：
Weijiang Zhou;M. Li;Lan Zhang;S. Chan
合成了两种以碳为载体的双金属铂-金催化剂，即核壳结构纳米颗粒(Au@Pt/C)和类合金纳米颗粒(AuPt/C)，并考察了它们在酸性条件下对乙醇的电氧化性能。用X射线衍射仪、X射线光电子能谱和透射电子显微镜对催化剂进行了表征。采用阳极CO溶出伏安法和乙醇电氧化循环伏安法对催化剂的催化活性进行了表征。X-射线光电子能谱分析表明，铂与金之间存在电子相互作用，且这种作用在合金化的ptau纳米粒子中更为明显。X-射线衍射分析表明，PTAU纳米粒子中的铂晶格参数和原子间距都发生了扩展。Ptau/C和Au@Pt/C样品中铂和金之间的相互作用是提高CO耐受性的主要原因。合金ptau/C中较强的铂-金相互作用和膨胀的铂晶格参数使得ptau/C的乙醇电氧化比活性高于Au@Pt/C。
Two bimetallic Pt-Au catalysts supported on carbon, namely core-shell structured nanoparticles (Au@Pt/C) and alloy-like nanoparticles (AuPt/C), were synthesized and tested for ethanol electro-oxidation in acidic environment. The catalysts were characterized by X-ray diffraction; X-ray photoelectron spectroscopy and transmission electron microscopy. Catalytic activity was quantified by anodic CO-stripping voltammetry, and cyclic voltammetry of ethanol electro-oxidation. The electronic interaction between Pt and Au was demonstrated by X-ray photoelectron spectroscopy and the effect was found to be more prominent in the alloy-like PtAu nanoparticles. X-ray diffraction revealed expanded Pt lattice parameter and interatomic distance in the PtAu nanoparticles. The interaction between Pt and Au of PtAu/C and Au@Pt/C samples was the main cause of the enhanced CO tolerance. The stronger Pt-Au interaction and the expanded Pt lattice parameter in alloyed PtAu/C contributed to the higher specific activity towards ethanol electro-oxidation of PtAu/C compared to Au@Pt/C.