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- Title
Platinum/Tantalum Carbide Core–Shell Nanoparticles with Sub‐Monolayer Shells for Methanol and Oxygen Electrocatalysis.
- Authors
Wang, Zhenshu; Kang, Jin Soo; Göhl, Daniel; Paciok, Paul; Gonçalves, Danelle S.; Lim, Hyung‐Kyu; Zanchet, Daniela; Heggen, Marc; Shao‐Horn, Yang; Ledendecker, Marc; Román‐Leshkov, Yuriy
- Abstract
Core–shell architectures provide great opportunities to improve catalytic activity, but achieving nanoparticle stability under electrochemical cycling remains challenging. Herein, core–shell nanoparticles comprising atomically thin Pt shells over earth‐abundant TaC cores are synthesized and used as highly durable electrocatalysts for the methanol oxidation reaction (MOR) and the oxygen reduction reaction (ORR) needed to drive direct methanol fuel cells (DMFCs). Characterization data show that a thin oxidic passivation layer protects the TaC core from undergoing dissolution in the fuel cell‐relevant potential range, enabling the use of partially covered Pt/TaC core–shell nanoparticles for MOR and ORR with high stability and enhanced catalytic performance. Specifically, at the anode the surface‐oxidized TaC further enhances MOR activity compared to conventional Pt nanoparticles. At the cathode, the Pt/TaC catalyst feature increases tolerance to methanol crossover. These results show unique synergistic advantages of the core–shell particles and open opportunities to tailor catalytic properties for electrocatalytic reactions.
- Subjects
ELECTROCATALYSIS; DIRECT methanol fuel cells; TANTALUM; NANOPARTICLES; OXIDATION of methanol; PLATINUM
- Publication
Advanced Energy Materials, 2024, Vol 14, Issue 17, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202304092