Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.217
Publication date: 7th February 2022
Solar-assisted carbon dioxide reduction reaction (CO2RR) offers the possibility to use atmospheric CO2
and sunlight to produce highly-valuable hydrocarbons such as methane, ethylene, and ethanol. So far, the
majority of the CO2RR investigations were carried out in water environments. Although this approach is
environmental-friendly and constitutes a promising strategy for future implementation with solar electro-
lyzers, three main drawbacks exist: the limited solubility of CO2 in water (~ 35 mmol/L at room tempera-
ture) (i), the competitive hydrogen evolution reaction (HER) occurring when performing CO2RR in water
that limits the overall Faradaic efficiency (ii), and the difficulty to use molecular homogeneous (pho-
to)catalysts that boost the unless poor selectivity of the reaction (iii). Therefore, the mid-term strategy is
to develop a double-compartment photoelectrochemical device where the anolyte and catholyte sides are
separated by polymeric membranes. Here, solar-driven oxygen evolution reaction (OER) occurs at the
water-based anolyte side, while CO2RR undergoes at the non-aqueous catholyte side of the cell. In this talk, we will present our recent in situ hard X-ray ambient pressure photoelectron spectroscopy
(AP-HAXPES) investigations of electrified solid/liquid interfaces. The experiments were performed at the
new SpAnTeX (Spectroscopic Analysis with Tender X-rays) end-station operating at the BESSY II syn-
chrotron facility. The seminar will focus on three activities performed at the SpAnTeX end-station:
• First, we will show how the chemistry of BiVO4 photoanode surfaces can be tuned when the sem-
iconducting material is in contact with an aqueous phosphate buffer solution;
• Second, we will present the results obtained on a gold polycrystalline surface/N,N-
dimethylformamide interface, as a function of the applied overpotential. At such an interface, io-
dine electrooxidation and CO2RR were studied under in situ conditions;
• Third, we will show some recent results obtained on newly-developed in situ cell for multimodal
in situ investigations, equipped with a gas diffusion layer and a polymeric membrane. We will conclude this contribution by discussing about future perspectives and technical implementations
for multimodal in situ investigations of (photo)electrocatalytic processes.
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