Proceedings of Catalyst Design Strategies for Photo- and Electrochemical Fuel Synthesis (ECAT25)
Publication date: 19th December 2024
Carbon dioxide reduction reaction (CO2RR) is a key technology for the chemical industry in a highly electrified energy scenario. To achieve its economic feasibility, it is necessary to reduce the operating voltage of the electrolyser. To this end, replacing the sluggish anodic oxygen evolution reaction (OER) with the glycerol oxidation reaction (GOR) is an interesting approach that also offers the opportunity to upcycle a low-value product.
In addition to the need to develop efficient and selective catalysts, the production routes should be easily scalable. In this context, we present electrodeposition as an effective and versatile tool to obtain thin film layers of electrocatalysts on metal foams and microporous layers of gas diffusion electrodes (GDE).
This paper presents the recent efforts of the group in the development of coupled systems. On the one hand, AuCu, CuIn alloys have been successfully deposited on GDEs and tested in continuous flow towards the CO2RR using different electrolytes. The results show that the presence of halides in the catholyte can avoid the undesirable hydrogen evolution reaction and favour the formation of carbon monoxide or formic acid, an effect that is enhanced by the use of binary alloys. On the other hand, NiCo layered double hydroxides [1] and AuIn alloys were deposited on nickel foams to carry out the electrooxidation of glycerol, with an electrode potential reduction of 0.2 to 0.5 V with respect to the OER reaction. The results show a strong dependence of the product distribution on the operating conditions, being feasible to obtain C3 products (DHA or lactic acid) under continuous flow of the electrolyte [2]. Finally, both half-reactions were coupled in a continuous flow reactor at operating current densities up to 200 mA cm-2.
This work has funded by project CO2GLY (PID2022-138491OB-C33) funded by MICIU/AEI /10.13039/501100011033 and by FEDER, UE. M.A. thanks Pla de Doctorats Industrials de la SUR de la Generalitat de Catalunya (2021DI20) and M.M. thanks Ajuts Joan Oró per a la contractació de personal investigador predoctoral en formació (FI) (2024 FI-1 00421), both granted by Agència de Gestió d’Ajuts Universitaris i de Recerca (AGAUR).
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