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Gold–Palladium Bimetallic Catalyst Stability: Consequences for Hydrogen Peroxide Selectivity
- Source :
- Pizzutilo, E, Freakley, S J, Cherevko, S, Venkatesan, S, Hutchings, G J, Liebscher, C H, Dehm, G & Mayrhofer, K JJ 2017, ' Gold–Palladium Bimetallic Catalyst Stability: Consequences for Hydrogen Peroxide Selectivity ', ACS Catalysis, vol. 7, no. 9, pp. 5699-5705 . https://doi.org/10.1021/acscatal.7b01447
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- During application, electrocatalysts are exposed to harsh electrochemical conditions, which can induce degradation. This work addresses the degradation of AuPd bimetallic catalysts used for the electrocatalytic production of hydrogen peroxide (H2O2) by the oxygen reduction reaction (ORR). Potential-dependent changes in the AuPd surface composition occur because the two metals have different dissolution onset potentials, resulting in catalyst dealloying. Using a scanning flow cell (SFC) with an inductively coupled plasma mass spectrometer (ICP-MS), simultaneous Pd and/or Au dissolution can be observed. Thereafter, three accelerated degradation protocols (ADPs), simulating different dissolution regimes, are employed to study the catalyst structure degradation on the nanoscale with identical location (IL) TEM. When only Pd or both Au and Pd dissolve, the composition changes rapidly and the surface becomes enriched with Au, as observed by cyclic voltammetry and elemental mapping. Such changes are mirrored by the evolution of electrocatalytic performances toward H2O2 production. Our experimental findings are finally summarized in a dissolution/structure/selectivity mechanism, providing a clear picture of the degradation of bimetallic catalyst used for H2O2 synthesis.
- Subjects :
- Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
Electrocatalyst
01 natural sciences
Catalysis
0104 chemical sciences
chemistry.chemical_compound
chemistry
Cyclic voltammetry
0210 nano-technology
Hydrogen peroxide
Bimetallic strip
Dissolution
Palladium
Subjects
Details
- ISSN :
- 21555435
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- ACS Catalysis
- Accession number :
- edsair.doi.dedup.....34b778e2667c4acb3bedfb68af841133