Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.163
Publication date: 11th July 2022
The direct conversion of greenhouse gases into green fuels and valuable chemicals is of paramount interest to achieve a decarbonized future [1]. The use of carbon dioxide and methane are of special interest as they are the main greenhouse gases emitted from anthropogenic sources, commonly considered industrial waste. In terms of fundamental research, the electrochemical carbon dioxide reduction to valuable chemicals has achieved great progress in the last few decades. Notwithstanding, few advances have been achieved in the electrochemical oxidation of methane [2].
Direct electrochemical methane activation strategies focus on tuning the electrode surface structure and composition [2]. The materials selected for the partial oxidation of methane need to activate methane and stabilize the intermediates involved to avoid the formation of carbon dioxide. Theoretical studies have shown that metal oxides are promising catalysts for the direct electrochemical activation of methane through the water discharge mechanism [3]. According to theoretical calculations, iridium oxide (IrOx) catalysts present a low overpotential for the oxygen evolution reaction (OER) and lower free energies of methane activation and *O formation compared to *OOH formation in the OER. Thus, these calculations suggest IrOx should be an interesting catalyst for the electrochemical conversion of methane into methanol. However, the experimental work published in this regard is very limited [4].
In this presentation, we show the results we acquired on the electrochemical methane activation using an IrOx surface as a catalyst in HClO4 electrolyte. For this purpose, we used an Ir polycrystalline oxidized electrochemically. The results aim to bring further understanding of the methane activation using metal oxides and discuss the purposed mechanisms reported in the literature.
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