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- Title
Sodium Alginate-Assisted Synthesis of PdAg Bimetallic Nanoparticles and their Enhanced Activity for Electrooxidation of Ethanol.
- Authors
Yin, Yanru; Wen, Changna; Ma, Ning; Wang, Baoyan; Zhang, Lianying; Li, Hongliang; Guo, Peizhi
- Abstract
Palladium and palladium-silver bimetallic nanocrystals have been synthesized hydrothermally by using environmental-friendly sodium alginate as the stabilizer and reducing agent. The pure palladium nanoparticles were spherical-like possibly due to the principle of the lowest surface energy, however, the formation of bimetallic palladium-silver nanoparticles was much more complicated, which was thinner and more irregular nanostructures than pure palladium nanoparticles. Electrochemical measurements showed that the electrocatalytic activity toward ethanol oxidation was increased first with the increase of silver content in bimetallic nanoparticles, from pure palladium of around 1070 mA/mg, to PdAg-20 of 1160 mA/mg and to PdAg-10 of 1750 mA/mg, and declined greatly at a high content of silver, approximately 279 mA/mg. Electrochemical stability test showed that PdAg-10 and PdAg-5 were the best and worst among four palladium-based samples, respectively. Based on the experimental data, the formation mechanism of pure palladium and palladium-silver bimetallic nanoparticles and the structure-property relationship of these samples have been discussed. When introducing Ag in Pd nanoparticles, the electrocatalytic activity of PdAg bimetallic nanoparticles toward ethanol oxidation was enhanced compared with pure Pd nanoparticles, and then followed by a drastic decrease in catalytic performance for PdAg nanoparticles with a high content of Ag. So, there has an optimum ratio for the content of Pd and Ag in PdAg bimetallic nanoparticles for the electrocatalysis of ethanol.
- Subjects
NANOPARTICLES; SURFACE energy; SODIUM compounds; ETHANOL; SODIUM alginate; SILVER ions
- Publication
NANO, 2019, Vol 14, Issue 9, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292019501200