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Angewandte Chemie 129 (2017) 6633-6638

The effect of surface site ensembles on the activity and selectivity of ethanol electrooxidation by octahedral PtNiRh nanoparticles

by Nina Erini, Vera Beermann, Martin Gocyla, Manuel Gliech, Marc Heggen, Rafal E Dunin-Borkowski, and Peter Strasser


Direct ethanol fuel cells are attractive power sources based on a biorenewable, high energy-density fuel. Their efficiency is limited by the lack of active anode materials which catalyse the breaking of the C−C bond coupled to the 12-electron oxidation to CO2. We report shape-controlled PtNiRh octahedral ethanol oxidation electrocatalysts with excellent activity and previously unachieved low onset potentials, while being highly selective to complete oxidation to CO2. A quantitative STEM/EDX analysis shows an inhomogeneous distribution of Pt and Ni within the octahedral nanoparticle catalysts and a speckled distribution of Rh over the nanoparticle surface, which gives rise to isolated Rh-rich patches. Our comprehensive characterisation and in situ electrochemical ATR studies suggest that the formation of a ternary surface site ensemble around the octahedral Pt3Ni1Rhx nanoparticles plays a crucial mechanistic role for this behaviour.

Further reading:

Nina Erini, Vera Beermann, Martin Gocyla, Manuel Gliech, Marc Heggen, Rafal E Dunin-Borkowski, and Peter Strasser: The effect of surface site ensembles on the activity and selectivity of ethanol electrooxidation by octahedral PtNiRh nanoparticles,
Angewandte Chemie 129 (2017) 6633-6638.


   
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