Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
(Photo-)electrochemical CO2 conversion to fuels like methanol suffers from the large activation barrier of CO2 reduction which tends to lead to low yields and efficiencies. It has been reported that pyridine when added to the electrolyte can catalyze this reduction reaction at lowered overpotentials on metal electrodes [1]. Based on the reported catalytic effects of dissolved pyridine on the CO2 reduction on semiconductors [2,3] we demonstrate that a functionalized p-Si electrode constitutes a promising interface for the photoelectrochemical CO2 reduction. The interface consists of a pyridine layer which is immobilized on the Si surface via an electrografting process of diazopyridine molecules [4]. Modified electrodes have been characterized using electrochemical methods, EC-STM and XPS. The grafted, covalently bound pyridine layer noticeably increases the electrochemical reactivity of the p-Si electrode.
[1] Seshadri et al., J. Electroanal. Chem., 1994, 372, 145-150
[2] Barton et al., J. Am. Chem. Soc., 2008, 130, 6342-6344
[3] Keets et al., Indian J. Chem., 2012, 51A, 1284-1297
[4] Li et al., Surf. Sci., 2015, 631, 185–189
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