Journal
ACS CATALYSIS
Volume 5, Issue 7, Pages 3916-3923Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b00602
Keywords
electrocatalysis; CO2 reduction; palladium-platinum catalysts; nanoparticles; formic acid
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Funding
- NanoNextNL, a micro- and nanotechnology consortium of the Government of The Netherlands
- Smart Mix Program of The Netherlands Ministry of Economic Affairs
- Netherlands Ministry of Education, Culture and Science
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The electrochemical reduction of CO2 has attracted significant interest recently, as it is a possible reaction for the storage of renewable energy. Here, we report on the synthesis of PdxPt(100-x)/C nanoparticles and their electrocatalytic properties for the reduction of CO2 to formic acid, compared with their activity for the reverse oxidation of formic acid to CO2. We find that PdxPt(100-x)/C nanoparticles have a very low onset potential for the reduction of CO2 to formic acid of ca. 0 V vs RHE, which approaches the theoretical equilibrium potential of 0.02 V vs RHE for this reaction. Furthermore, the Pd70Pt30/C catalyst shows a faradaic efficiency of 88% toward formic acid after 1 h of electrolysis at -0.4 V vs RHE with an average current density of similar to 5 mA/cm(2). Therefore, this catalyst shows a competing or even better faradaic efficiency toward formic acid compared to recently reported catalysts, at a substantially lower overpotential, while avoiding a strong deactivation that was observed with previously reported Pd-based catalysts.
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