Electrocatalytic properties of Au@Pt nanoparticles: effects of Pt shell packing density and Au core size |
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Authors: | Du Bingchen Zaluzhna Oksana Tong YuYe J |
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Institution: | Department of Chemistry, Georgetown University, 37th and O St, NW, Washington, DC 20057, USA. |
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Abstract: | A detailed study of electrocatalytic properties of Au@Pt nanoparticles (NPs) as functions of Pt shell packing density and Au core size in terms of CO/methanol oxidation and oxygen reduction reactions is reported here. While most samples studied showed inferior catalytic activities to those of the commercial Pt black that fall reasonably well in a d-band-center up-shift (i.e., stronger surface bonding) regime, the steepest activity recovery trend as manifested by the smallest Au-core samples suggests a plausible transition to a d-band-center down-shift (i.e., weaker surface bonding) regime as the Au core becomes smaller. |
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