Electrochemical Reduction of CO2 on Compositionally Variant Au-Pt Bimetallic Thin Films
Ming Ma a, Heine Hansen b, Marco Valenti a, Wilson Smith a
a Delft University of Technology, The Netherlands, Julianalaan, 136, Delft, Netherlands
b Technical University of Denmark, Department of Energy Conversion and Storage, Frederiksborgvej, 399, Roskilde, Denmark
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SF1: Material and Device Innovations for the Practical Implementation of Solar Fuels (SolarFuel17)
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Wilson Smith and Ki Tae Nam
Oral, Ming Ma, presentation 162
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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