TY - JOUR
T1 - Ultrafine PtRh-Co3O4 ternary alloy nanoparticles with enhanced electrocatalytic activity and long-term stability for alcohol electro-oxidation
AU - Bhuvanendran, Narayanamoorthy
AU - Choi, Min Gyeong
AU - Jang, Minho
AU - Kim, Doeun
AU - Lee, Sae Youn
N1 - Publisher Copyright:
© 2023
PY - 2023/8/25
Y1 - 2023/8/25
N2 - To date, the development of structure-sensitive electrocatalysts is crucial, consisting of oxophilic metals and a conductive support with Pt-rich surfaces. In this study, PtRh-Co3O4 ternary alloy nanoparticles (∼2–3 nm) were uniformly distributed on carbon (PtRh-Co3O4/C) via a co-chemical reduction method. The chemical inertness and oxophilicity of Rh, along with the abundant oxygen defects of Co3O4, contributed to improving the kinetics of the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) in PtRh-Co3O4/C by promoting the scission of C-C and C-H bonds. PtRh-Co3O4/C displayed high intrinsic activity for both MOR (6.8 mA/cm2Pt) and EOR (3.17 mA/cm2Pt) due to the strong electronic, ligand, and bifunctional effects. Even after 7000 potential cycles, it retained 81% (MOR) and 84% (EOR) of its initial value, indicating extended stability. Compared to other Pt-based benchmark catalysts, PtRh-Co3O4/C exhibited higher CO tolerance, extended activity, and stability, making it a promising electrocatalyst with competitive performance for alcohol electro-oxidation.
AB - To date, the development of structure-sensitive electrocatalysts is crucial, consisting of oxophilic metals and a conductive support with Pt-rich surfaces. In this study, PtRh-Co3O4 ternary alloy nanoparticles (∼2–3 nm) were uniformly distributed on carbon (PtRh-Co3O4/C) via a co-chemical reduction method. The chemical inertness and oxophilicity of Rh, along with the abundant oxygen defects of Co3O4, contributed to improving the kinetics of the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) in PtRh-Co3O4/C by promoting the scission of C-C and C-H bonds. PtRh-Co3O4/C displayed high intrinsic activity for both MOR (6.8 mA/cm2Pt) and EOR (3.17 mA/cm2Pt) due to the strong electronic, ligand, and bifunctional effects. Even after 7000 potential cycles, it retained 81% (MOR) and 84% (EOR) of its initial value, indicating extended stability. Compared to other Pt-based benchmark catalysts, PtRh-Co3O4/C exhibited higher CO tolerance, extended activity, and stability, making it a promising electrocatalyst with competitive performance for alcohol electro-oxidation.
KW - CoO
KW - Ethanol oxidation
KW - Methanol oxidation
KW - PtRh
KW - Ternary alloy nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=85152664115&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2023.170183
DO - 10.1016/j.jallcom.2023.170183
M3 - Article
AN - SCOPUS:85152664115
SN - 0925-8388
VL - 953
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 170183
ER -