Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The electroreduction of CO2 on Au-Pt bimetallic films with tunable compositions was examined, which provides a platform for exploring the correlation of the catalytic activity with the composition of bimetallic electrocatalysts. The Au-Pt alloy films were prepared by a magnetron sputtering co-deposition technique with controllable composition, showing that the syngas ratio (CO:H2) could be tailored by systematically controlling the binary composition. The tunable catalytic selectivity is ascribed to the change of binding strength of COOH and CO intermediates, affected by the surface electronic structure (d-band center energy) which is linked to the surface composition of the bimetallic films. Notably, a d-band center was gradually shifted away from Fermi level with increasing Au content, which correspondingly weakens the binding strength of the COOH and CO intermediates, resulting in the distinct catalytic activity in the reduction of CO2 with tunable compositions. In addition, the formation of formic acid in the bimetallic systems at reduced overpotentials and higher yield indicates that synergistic effects can facilitate reaction pathways for products that are not accessible with the individual components.
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