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Enhanced Oxygen Reduction Activity on Carbon Supported Pd Nanoparticles Via SiO 2
Author(s) -
Bao Zhikang,
Zhou Hu,
Song Xin,
Gao Yijing,
Zhuang Guilin,
Deng Shengwei,
Wei Zhongzhe,
Zhong Xing,
Wang Jianguo
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201801511
Subject(s) - catalysis , coprecipitation , x ray photoelectron spectroscopy , palladium , methanol , nanoparticle , oxygen reduction reaction , materials science , chemical engineering , carbon fibers , oxygen , oxygen reduction , inorganic chemistry , chemistry , nanotechnology , composite number , organic chemistry , electrochemistry , composite material , electrode , engineering
To improve Pd‐based catalysts activity and stability is still challenge although Pd‐based catalysts have attracted attention for oxygen reduction reaction (ORR) during recent years. In this study, we have prepared supported Pd on SiO 2 , in which conductive carbon was used by coprecipitation method Pd/SiO 2 @C or physically mixed Pd/SiO 2 .Pd/SiO 2 @C (10 wt%) owned more outstanding catalytic activity, preferable durability, and stronger methanol tolerance capability in alkaline solution for ORR, which compared with commercial Pt/C (20 wt%) and Pd/C catalysts. We analyzed the morphology and electronic properties of the catalyst by SEM, TEM, XRD and XPS. It was found that the introduction of SiO 2 changed the electronic structure of palladium, resulting in the production of electron‐rich Pd NPs, which was further confirmed by density functional theory calculations. Therefore, the introducing a small amount of SiO 2 plays a vital role in facilitating the ORR activity of Pd‐based catalysts, which may be a new strategy to design new ORR catalysts and replace Pt‐based catalysts in fuel.