Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The electro-reduction of CO2 is a promising way to balance the continuously rising levels of atmospheric CO2. In this artificial carbon cycle, renewable energy is applied to sustainably convert CO2 into high-value added products. A wide variety of electro-catalysts have been developed for CO2 conversion. Among them, Cu and Au are the most attractive ones, as Cu can reduce CO2 into 16 kinds of products and Au holds an excellent activity. Recently, researchers found that alloying is an approach to promote the activity and selectivity of CO2 reduction reaction (CO2RR) by tuning the binding strength of intermediates on the surface.
Here, the Au-Cu alloys were prepared by magnetron sputtering with well-controlled composition. The stoichiometric ratios on surface and in bulk are confirmed to be uniform, which indicates that the composition could be readily and gradiently tuned. The electronic structure of the catalysts is related to the binding strength of intermediates. Valence-band X-ray photoelectron spectroscopy (XPS) showed that the variation of d-band structure is corresponding to the change of composition. The binding strength of the first intermediates (COOH and CO) is deceased as Au content increases, leading to fewer kinds of products was found. From electrochemical impedance spectroscopy (EIS), we found that the charge transfer resistance (RCT) was lowered as the Au-to-Cu ratio raised. Using this bimetallic thin film platform, the combination of EIS and other in-situ measurements could pave the way to gain a deeper insight of electro-catalytic CO2 reduction.
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