Journal
CATALYSTS
Volume 5, Issue 2, Pages 992-1002Publisher
MDPI
DOI: 10.3390/catal5020992
Keywords
hollow porous Pd nanospheres; polyallylamine hydrochloride; sacrificial SiO2 nanoparticles; formic oxidation reaction
Categories
Funding
- NSFC [21376122, 21273116]
- United Fund of NSFC [U1137602]
- United Fund of Yunnan Province [U1137602]
- National Basic Research Program of China (973 Program) [2012CB215500]
- Postgraduate Research and Innovation Project in Jiangsu Province [CXLX13-369]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National and Local Joint Engineering Research Centre of Biomedical Functional Materials
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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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