Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023 (P.R. China).
Chemistry. 2014 Jan 7;20(2):585-90. doi: 10.1002/chem.201302834. Epub 2013 Nov 29.
Pt alloy nanostructures show great promise as electrocatalysts for the oxygen reduction reaction (ORR) in fuel cell cathodes. Herein, three-dimensional (3D) Pt-Pd-Co trimetallic network nanostructures (TNNs) with a high degree of alloying are synthesized through a room temperature wet chemical synthetic method by using K2 PtCl4 /K3 Co(CN)6 -K2 PdCl4 /K3 Co(CN)6 mixed cyanogels as the reaction precursor in the absence of surfactants and templates. The size, morphology, and surface composition of the Pt-Pd-Co TNNs are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), energy dispersive spectroscopy (EDS), EDS mapping, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The 3D backbone structure, solid nature, and trimetallic properties of the mixed cyanogels are responsible for the 3D structure and high degree of alloying of the as-prepared products. Compared with commercially available Pt black, the Pt-Pd-Co TNNs exhibit superior electrocatalytic activity and stability towards the ORR, which is ascribed to their unique 3D structure, low hydroxyl surface coverage and alloy properties.
Pt 合金纳米结构在燃料电池阴极的氧还原反应（ORR）中作为电催化剂具有很大的应用前景。在此，通过在室温下的湿化学合成方法，使用 K2PtCl4/K3Co(CN)6-K2PdCl4/K3Co(CN)6 混合氰凝胶作为反应前体，在没有表面活性剂和模板的情况下，合成了具有高度合金化的三维（3D）Pt-Pd-Co 三金属网络纳米结构（TNNs）。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、选区电子衍射（SAED）、能谱（EDS）、EDS 映射、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）研究了 Pt-Pd-Co TNNs 的尺寸、形貌和表面组成。混合氰凝胶的 3D 骨架结构、固态和三金属性质是制备产物具有 3D 结构和高合金化程度的原因。与商业 Pt 黑相比，Pt-Pd-Co TNNs 对 ORR 表现出优异的电催化活性和稳定性，这归因于其独特的 3D 结构、低羟基表面覆盖度和合金性质。
