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- Title
Morphology‐ and composition‐controlled silver‐containing rhodium nanoparticles for the oxygen reduction reaction.
- Authors
Hwang, Gyu Seop; Shin, Woojun; Yim, Gyeonghye; Choi, Jae Hyuk; Kim, Young‐Kwan; Jang, Hongje; Kim, Yang‐Rae
- 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.
- Subjects
HYDROGEN evolution reactions; OXYGEN reduction; RHODIUM; ENERGY conversion; CYCLIC voltammetry; IMPEDANCE spectroscopy; PHOTOCATHODES
- Publication
Bulletin of the Korean Chemical Society, 2022, Vol 43, Issue 11, p1240
- ISSN
0253-2964
- Publication type
Article
- DOI
10.1002/bkcs.12619