Advances and Fundamental Understanding of Electrocatalytic Methane Oxidation

Abstract

Methane utilization is one of the promising energy‐efficient conversions which can potentially control its emissions as an additional benefit. In this regard, electrochemically methane conversion is particularly attractive as a fossil‐free and sustainable strategy to generate power and fuels of global importance. However, it is relatively less explored. This review aims to highlight the feasibility of the electro‐conversion approach via electrocatalytic methane oxidation (EMO) reaction. The recent progress regarding power generation as well as value‐added fuel/chemical production, such as hydrocarbons, alcohols, acids, and ketones, is summarized. Additional mechanistic insights to increase the fundamental understanding of the EMO reaction pathways underlying various catalytic modes and their challenges are provided. Theoretical modeling focusing on the reactivity trends and performance kinetics is also presented, along with key recommendations for the material design that need to be addressed. Suggesting some insights on catalysts‐related developing directions and chances in the EMO field is concluded.

Recent advances in ambient electrochemical methane conversion to oxygenates using metal oxide electrocatalysts

“…4,[20][21][22][23][24] However, the SMR process necessitates high temperature and pressure conditions, is energy-intensive, and generates substantial carbon emissions. [25][26][27] Therefore, it is crucial to develop practical and environmentally friendly alternatives to methane conversion. In the field of catalysis, the strategies to convert methane to oxygenates are divided into five areas: bio-catalysis, homogeneous catalysis, thermal heterogeneous catalysis, photocatalysis, and electrocatalysis.…”

Assessing the potential benefits of methane oxidation technologies using a concentration-based framework

“…We categorize technologies based on their energy source: heat, light, or biological enzymes (table 1). Methane oxidation using electric potential may also be feasible, although current proposals primarily focus on converting high concentration methane streams into value-added end products [16].…”

Understanding (photo)electrocatalysis for the conversion of methane to valuable chemicals through partial oxidation processes

“…In previous review articles, the effects of electrocatalysts, reaction conditions, and cell configurations on the formation of final products have already been well discussed and summarized in tables. 20,26,63–73 In this review, we mainly focused on the theoretical approach to interpret the CH 4 partial oxidation process on active sites in mild conditions, and overviewed the recent research results.…”