Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.076
Publication date: 11th July 2022
Electrochemical reduction of NOx, CO2, N2 and combinations hold the promise to be a cornerstone for sustainable production of fuels and chemicals. Importantly, all reactions share a direct competition with hydrogen, and furthermore, several products are formed from each reactant of these reactants.
For electrochemical CO2, a complex reaction, it has been shown to give multiple different products depending on the metal catalyst [1]. The unique copper catalyst, as the only metal catalyst has the ability to bind *CO without the coadsorption of *H, which results in a high-value multiple-carbon product distribution [2].
For electrochemical NOx, also multiple products are formed; N2O, N2 and NH3[3]. Uniquely again the copper catalyst stands out with the ability to bind *NO without the coadsorption of *H, which enables copper to produce ammonia [4].
For electrochemical N2 reduction to ammonia (NH3) the interest at ambient conditions is burgeoning [5-6]. Most interesting for the direct electrochemical N2 reduction in aqueous there is not a “copper” catalyst [7], and instead, the reaction is limited to the non-aqueous lithium-mediated system.
In this talk I will give a unified approach to these reduction reactions versus hydrogen:
► Show an original and simplistic view of reduction reactions versus hydrogen by investigating the *NO, *CO and *N2 binding energies versus the *H binding energies. This gives direct insight into the product formation for NOx and CO2 reduction, and the challenge of the direct N2 reduction reaction.
► Show how one can use these molecular binding energies versus hydrogen in combination to form products beyond the typical reduction reaction products, which reduction reactions are possible based on this framework and how to challenge it [8].
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