Electro-oxidation of glycerol by tetrametallic platinum-gold-palladium-silver nanoparticles

作者：Zhou, Yongfang; Shen, Yi^*

来源：Journal of Applied Electrochemistry, 2021, 51(1): 79-86.

DOI：10.1007/s10800-020-01426-z

• PtAuPdAg
• Glycerol oxidation
• Selectivity
• Dihydroxyacetone
• Seed-mediated synthesis

In this work, the electrochemical conversion of glycerol was studied on tetrametallic PtAuPdAg catalyst. The PtAuPdAg nanoparticles were synthesized via a seed-mediated growth process. The structure of the as-prepared PtAuPdAg nanoparticles was characterized by transmission electron microscopy, electron energy loss spectroscopy and UV-vis absorption spectroscopy. Electrochemical results indicate that the PtAuPdAg catalyst exhibits superior activity towards glycerol oxidation when compared with the Pt/C catalyst. In alkaline solutions, the PtAuPdAg catalyst possesses a current density of 8.90 mA cm(-2), which is 18.2 times that of the Pt/C. Moreover, this result is higher than that of most previously reported catalysts. Additionally, the products of glycerol oxidation over the catalyst at potentials of 0.5, 0.7, 0.9, 1.1 and 1.3 V were analyzed by high performance liquid chromatography (HPLC). HPLC results show that the PtAuPdAg catalyst yields a remarkable dihydroxyacetone selectivity of 79.6%, and that the operating conditions have limited effects on the product distribution. @@@ [GRAPHICS] @@@ .

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