Morphology- and composition-controlled silver-containing rhodium nanoparticles for the oxygen reduction reaction

Gyu Seop Hwang, Woojun Shin, Gyeonghye Yim, Jae Hyuk Choi, Young Kwan Kim, Hongje Jang, Yang Rae Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Rh nanoparticles (RhNPs) have attracted significant attention due to their superior electrocatalytic activity in several energy conversion reactions. However, studies relating their morphology and performance are rare. In this study, three types of RhNPs, i.e., nanoshells, nanoframes, and porous nanoplates, were synthesized via inverse-directional galvanic replacement. The relationship between the performance of the RhNPs at catalyzing the oxygen reduction reaction (ORR) and their morphology was investigated using cyclic voltammetry, linear sweep voltammetry, the Tafel slope, and electrochemical impedance spectroscopy. X-ray photoelectron spectroscopy and X-ray diffraction data revealed that the RhNPs contained different Rh/Ag ratios. All the RhNPs exhibited long-term stability under acidic conditions. In particular, nanoshell-structured RhNPs exhibited superior ORR activity as determined from the slope of the Tafel plot, the number of electrons, and the onset potential compared to a commercial Rh electrocatalyst and other RhNPs. Evidently, controlling the morphology and composition of RhNPs greatly facilitates efficient electrocatalysis.

Original languageEnglish
Pages (from-to)1240-1246
Number of pages7
JournalBulletin of the Korean Chemical Society
Volume43
Issue number11
DOIs
StatePublished - Nov 2022

Keywords

  • electrocatalysis
  • electrocatalyst
  • energy conversion
  • fuel cell
  • morphology control

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