Pre-deposited Co nanofilms promoting high alloying degree of PdxAu nanoparticles as electrocatalysts in alkaline media

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

4 Scopus Citations
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Author(s)

  • Yulong Sun
  • Jianchao Shi
  • Yumei Chen
  • Mengmeng Chen
  • Lulu An
  • Jianliang Cao
  • Baozhong Liu

Detail(s)

Original languageEnglish
Pages (from-to)28024-28033
Journal / PublicationInternational Journal of Hydrogen Energy
Volume45
Issue number52
Online published10 Apr 2020
Publication statusPublished - 23 Oct 2020
Externally publishedYes

Abstract

High alloyed and well dispersed PdxAu nanoparticles are deposited on pre-deposited Co nanofilm substrates (PdxAu/Co-nanofilms/C) by using an immiscible ionic liquid (IL)/water interface. However, low alloyed PdxAu/C catalysts are formed without pre-deposited Co nanofilms through the same synthesis method. The high-alloyed PdxAu/Co-nanofilms/C catalysts demonstrate significantly increased activity for ethanol oxidation reaction (EOR) than low-alloyed PdxAu/C of the same Pd/Au composition, with the catalysts of low Pd/Au atom ratio (Pd:Au = 1:1) demonstrating the optimal activity. Notably, high alloyed degree of the PdxAu nanoparticles in the PdxAu/Co-nanofilms/C catalysts brings the lattice expansion of Pd, causing an up-shift of the d-band center, which results in the enhancement of OH adsorption and correspondingly promotes electro-oxidation of ethanol excluding the effect of Co nanofilm substrates. Differently, the enhancement activities of the Pd-Au bimetallic system for oxygen reduction reaction (ORR) are almost not affected by the alloying degree and only dependent on Pd/Au atom ratios, with the catalysts of low Pd/Au atom ratio (Pd:Au = 1:1) displaying the highest ORR mass activity, respectively. These results exhibit the specific dependence between the different electrochemical process and the physical parameters for the Pd-Au bimetallic system. © 2020 Hydrogen Energy Publications LLC.

Research Area(s)

  • Alkaline media, Co nanofilms, Ethanol oxidation reaction, Oxygen reduction reaction, Pd-Au bimetallic electrocatalysts

Citation Format(s)

Pre-deposited Co nanofilms promoting high alloying degree of PdxAu nanoparticles as electrocatalysts in alkaline media. / Sun, Yulong; Shi, Jianchao; Chen, Yumei et al.
In: International Journal of Hydrogen Energy, Vol. 45, No. 52, 23.10.2020, p. 28024-28033.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review