First-Principles Study of Pt-Based Bifunctional Oxygen Evolution & Reduction Electrocatalyst: Interplay of Strain and Ligand Effects
- Authors
- Kim, Seung-hoon; Kang, Yoonmook; Ham, Hyung Chul
- Issue Date
- 11월-2021
- Publisher
- MDPI
- Keywords
- bifunctional; density functional theory; electrocatalyst; oxygen evolution reaction; oxygen reduction reaction
- Citation
- ENERGIES, v.14, no.22
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGIES
- Volume
- 14
- Number
- 22
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135924
- DOI
- 10.3390/en14227814
- ISSN
- 1996-1073
- Abstract
- We examined the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) of Pt-based Pt3M/Pt nanoalloy catalysts (where M represents a 3d transition metal) for bifunctional electrocatalysts using spin-polarized density functional theory calculations. First, the stability of the Pt3M/Pt catalyst was investigated by calculating the bulk formation energy and surface separation energy. Using the calculated adsorption energies for the OER/ORR intermediates in the modeled catalysts, we predicted the OER/ORR overpotentials and potential limiting steps for each catalyst. The origins of the enhanced catalytic reactivity in Pt3M/Pt catalysts caused by strain and ligand effects are explained separately. In addition, compared to Pt(111), the OER and ORR activities in a Pt3Ni/Pt-skin catalyst with a Pt skin layer were increased by 13.7% and 18.4%, respectively, due to the strain and ligand effects. It was confirmed that compressive strain and ligand effects are key factors in improving the catalytic performance of OER/ORR bifunctional catalysts.
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Collections - Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL) > Department of Energy and Environment > 1. Journal Articles
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