Ligand-Exchange-Assisted Layer-by-Layer Assembly of Au-Pt Bimetallic Nanocomposite Films and Their Electrocatalytic Activities for Hydrogen Evolution Reaction

Sujin Lee, Yongkwon Song, Jinhan Cho, Youn Jeong Jang, Bongjun Yeom

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Platinum (Pt) is a popular electrocatalyst for the hydrogen evolution reaction (HER) for water splitting. However, a facile synthesis route with improved activity and stability remains to be established. In this study, Au-Pt bimetallic nanocomposite electrodes for the HER are prepared by ligand-exchange-assisted layer-by-layer (LbL) self-assembly methods. Pt and Au nanoparticles (NPs) are alternately deposited onto Ti electrodes paired with short alkyl amines. This process is accompanied by the removal of the preattached bulky surface ligands. The resulting Pt and Au NP LbL nanocomposite films are characterized by uniform thin-film depositions with high electrical conductivity (8.7 × 104 S cm-1). With the increase in the number of depositions, the overpotentials of the Au-Pt LbL samples gradually decrease and reach 66 mV at a current density of 10 mA cm-2 under an acidic condition of 0.5 M H2SO4, which is accomplished with a significantly small Pt loading (0.73 wt %). Furthermore, the overpotentials of the Au-Pt bimetallic LbL films are one-third of the Pt NP LbL films. The enhanced activity can be attributed to the synergistic effect of the d-band shift from the bimetallic heterostructure, high electrical conductivity, rapid charge transfer, and increased electrochemical surface area.

Original languageEnglish
Pages (from-to)10961-10969
Number of pages9
JournalACS Applied Energy Materials
Volume6
Issue number21
DOIs
Publication statusPublished - 2023 Nov 13

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • Au−Pt bimetallic film
  • electrocatalyst
  • hydrogen evolution reaction
  • layer-by-layer assembly
  • water splitting

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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