Effects of Metal-Doping on Hydrogen Evolution Reaction Catalyzed by MAu 24 and M 2 Au 36 Nanoclusters (M = Pt, Pd)

Woojun Choi, Guoxiang Hu, Kyuju Kwak, Minseok Kim, De En Jiang, Jai Pil Choi, Dongil Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This paper describes the effects of doped metals on hydrogen evolution reaction (HER) electrocatalyzed by atomically controlled MAu 24 and M 2 Au 36 nanoclusters, where M = Pt and Pd. HER performances, such as onset potential (E onset ), catalytic current density, and turnover frequency (TOF), are comparatively examined with respect to the doped metals. Doping Pt or Pd into gold nanoclusters not only changes the electrochemical redox potentials of nanoclusters but also considerably improves the HER activities. E onset is found to be controlled by the nanocluster's reduction potential matching the reduction potential of H + . The higher catalytic current and TOF are observed with the doped nanoclusters in the order of PtAu 24 > PdAu 24 > Au 25 . The same trend is observed with the Au 38 group (Pt 2 Au 36 > Pd 2 Au 36 > Au 38 ). Density functional theory calculations have revealed that the hydrogen adsorption free energy (G H ) is significantly lowered by metal-doping in the order of Au 25 > PdAu 24 > PtAu 24 and Au 38 > Pd 2 Au 36 > Pt 2 Au 36 , indicating that hydrogen adsorption on the active site of nanocluster is thermodynamically favored by Pd-doping and further by Pt-doping. The doped metals, albeit buried in the core of the nanoclusters, have profound impact on their HER activities by altering their reduction potentials and hydrogen adsorption free energies.

Original languageEnglish
Pages (from-to)44645-44653
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number51
DOIs
Publication statusPublished - 2018 Dec 26

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this