Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.124
Publication date: 11th July 2022
Global energy demand is increasing exponentially and the main source of energy is still based on fossil fuels, which are scarce and responsible for the majority of carbon dioxide (CO2) emissions into the atmosphere. Green hydrogen has emerged as a promising energy vector to respond to this increasing energy demand and to decarbonize transportation, heating and fine chemicals sectors. On the other hand, electrochemical CO2 conversion into energy-rich fuels and chemicals has gained significant interest as a potential strategy for simultaneously mitigating increasing global CO2 concentration.
Here we present a cost-effective copper-based electrocatalyst to evolve hydrogen with faradaic efficiencies close to 100%. Moreover, this electrocatalyst in presence of CO2 is able to reduce it in formic acid with faradaic efficiencies close to 70%. Beyond the easy synthesis of this electrocatalyst and its high efficiencies for hydrogen evolution (HER) and CO2 reduction reaction (CO2RR), what really makes this material interesting is its behavior during the electrocatalysis. This copper-derived electrocatalyst enhance its currents as a function of time when evolves hydrogen increasing too the active surface area almost proportionally. While in its application for CO2 reduction, its activity was studied when the electrode is reused several times, showing an increasing selectivity trend toward formic acid in each use.
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