Abstract
In this work, the selective electrocatalytic reduction of carbon dioxide to carbon monoxide on oxide-derived silver electrocatalysts is presented. By a simple synthesis technique, the overall high faradaic efficiency for CO production on the oxide-derived Ag was shifted by more than 400 mV towards a lower overpotential compared to that of untreated Ag. Notably, the Ag resulting from Ag oxide is capable of electrochemically reducing CO2to CO with approximately 80 % catalytic selectivity at a moderate overpotential of 0.49 V, which is much higher than that (ca. 4 %) of untreated Ag under identical conditions. Electrokinetic studies show that the improved catalytic activity is ascribed to the enhanced stabilization of COOH.intermediate. Furthermore, highly nanostructured Ag is likely able to create a high local pH near the catalyst surface, which may also facilitate the catalytic activity for the reduction of CO2with suppressed H2evolution.
Original language | English |
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Pages (from-to) | 9748-9752 |
Number of pages | 5 |
Journal | Angewandte Chemie - International Edition |
Volume | 55 |
Issue number | 33 |
DOIs | |
Publication status | Published - 1 Jan 2016 |
Funding
This work is supported by CSC, and the NWO VENI grant awarded to Wilson A. Smith. The authors would like to thank Dr. Kristina Djanashvili for assistance in the 400 MHz NMR experiments. We also would like to thank Prof. Bernard Dam and Dr. David Vermaas for helpful discussions.
Keywords
- carbon dioxide
- conversion of carbon dioxide
- electrocatalysis
- heterogeneous catalysis
- surface chemistry