Challenges in the selective electrochemical oxidation of methane: Too early to surrender

The selective electrochemical oxidation of methane (SEOM) to value-added chemicals has been pursued for decades without breakthroughs and developments beyond academic research. Main setbacks encountered in virtually every report are poor methane conversion rate and selectivity. We propose that for tangible progress, research should focus on tackling CH4 mass transport and concentration limitations. At the same time, harmonized research protocols must be developed, e.g., to define standard control experiments and key metrics. This will facilitate data comparison and accelerate electrocatalyst discovery, which so far remained challenging due to inconsistent data reporting practices. Fundamental research on model (well-defined) electrocatalysts should also be intensified, along with in-situ spectroscopic investigations to understand the reaction mechanism and design catalysts to prevent overoxidation.