Sacrificial Template-Based Synthesis of Unified Hollow Porous Palladium Nanospheres for Formic Acid Electro-Oxidation

Sacrificial Template-Based Synthesis of Unified Hollow Porous Palladium Nanospheres for Formic Acid Electro-Oxidation
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基于牺牲模板的甲酸电氧化统一中空多孔钯纳米球的合成

DOI:
10.3390/catal5020992
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发表时间:
2015-06
期刊:
影响因子:
3.9
通讯作者:
Tang, Yawen
Tang, Yawen
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Fengqi;Wu, Peishan;Wu, Pin;Tang, Yawen

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具有中空多孔结构的均匀金属纳米颗粒的大规模合成因其高比表面积、丰富的活性位点和相对高效的催化活性而备受关注。在此,我们报告了一种在聚烯丙胺盐酸盐(PAH)的帮助下通过层层自组装来模板牺牲SiO2纳米粒子来合成空心多孔Pd纳米球(Pd HPNSs)的通用方法。化学惰性的PAH可作为有效的稳定剂和络合剂来控制Pd HPNS的合成,这可能是由于其长的脂肪族烷基链、优异的配位能力和良好的亲水性。 Pd HPNSs 的物理化学性质可通过透射电子显微镜、X 射线衍射、X 射线光电子能谱等多种技术进行彻底表征。基于对不同实验观察结果的分析,研究了 Pd HPNS 的生长机制。与商业钯黑相比,所制备的 Pd HPNS 在酸性介质中的甲酸氧化反应 (FAOR) 中表现出明显增强的电催化活性和耐久性。
Large scale syntheses of uniform metal nanoparticles with hollow porous structure have attracted much attention owning to their high surface area, abundant active sites and relatively efficient catalytic activity. Herein, we report a general method to synthesize hollow porous Pd nanospheres (Pd HPNSs) by templating sacrificial SiO2 nanoparticles with the assistance of polyallylamine hydrochloride (PAH) through layer-by-layer self-assembly. The chemically inert PAH is acting as an efficient stabilizer and complex agent to control the synthesis of Pd HPNSs, probably accounting for its long aliphatic alkyl chains, excellent coordination capability and good hydrophilic property. The physicochemical properties of Pd HPNSs are thoroughly characterized by various techniques, such as transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy. The growth mechanism of Pd HPNSs is studied based on the analysis of diverse experimental observations. The as-prepared Pd HPNSs exhibit clearly enhanced electrocatalytic activity and durability for the formic oxidation reaction (FAOR) in acid medium compared with commercial Pd black.
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