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Manuscript Submission Deadline 28 February 2023

Direct liquid fuel cells (DLFCs) have received worldwide research interest as a promising energy conversion technology, primarily due to their simple system design, high conversion efficiency, low carbon dioxide emissions as well as quick fuel refueling. Liquid fuels have attracted great attention due to its excellent properties, including high volumetric energy density, easy storage and transportation, as well as quick refilling, which is suitable for mobile, stationary and portable devices. Among them, an electrically rechargeable liquid fuel (e-fuel), typically made of various electroactive species, including inorganic materials (e.g., metal ions), organic materials (e.g., alloxazines), and suspensions of particles (e.g., polysulfide-based nanofluid), has attracted worldwide attention. The research on electrochemistry of fuel oxidation reaction and oxygen reduction reaction has made great progress. The development of direct liquid e-fuel cells will play an important role in the future of consumer electronics, electric vehicles, and stationary power plant.

Currently, direct liquid fuel cells (DLFCs) have received worldwide research interest as a promising energy conversion technology, primarily because unlike gaseous hydrogen, liquid fuels are energy dense and easy and safe to store and transport as gasoline. However, most of these developed DLFCs must use noble metal catalysts for liquid fuel oxidation reactions but yield limited fuel cell performance. Hence, as an alternative for liquid fuels, a great deal of research efforts is inspired toward direct liquid e-fuel cells. Recently, numerous works have been performed both experimentally and theoretically to expand our fundamental understanding and provide new insights into the electrochemistry of liquid e-fuel oxidation reaction and oxygen reduction reaction, the catalyst and membrane synthesis and modification, electrode fabrication and optimization, and fuel cell system designs of direct liquid e-fuel cells to understand the reaction pathways, improve the reaction kinetics, enhance the fuel cell durability, and reduce the system cost.

In this Research Topic on “Advances in the Electrochemistry of Direct Liquid e-Fuel Cells”, we would like to provide state-of-the-art achievements from fundamental to applications in direct liquid e-fuel cells. This Research Topic will cover fundamental aspects on mathematical modeling and simulation, newly developed characterization technologies, novel catalyst and membrane synthesis and modification, and innovative fuel cell system designs. We welcome short communications, original research papers, perspectives and review articles, which cover but not limit to the following topics:

• Mathematical modeling coupling the electrochemistry and physical processes
• Development of novel catalysts with high electrochemical activity
• Studies on liquid e-fuel oxidation mechanism and pathways
• Studies on electrode-electrolyte interface electrochemistry
• Development and optimization of novel fuel cell systems
• Development of advanced analysis and diagnosis technologies

Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.

Direct liquid fuel cells (DLFCs) have received worldwide research interest as a promising energy conversion technology, primarily due to their simple system design, high conversion efficiency, low carbon dioxide emissions as well as quick fuel refueling. Liquid fuels have attracted great attention due to its excellent properties, including high volumetric energy density, easy storage and transportation, as well as quick refilling, which is suitable for mobile, stationary and portable devices. Among them, an electrically rechargeable liquid fuel (e-fuel), typically made of various electroactive species, including inorganic materials (e.g., metal ions), organic materials (e.g., alloxazines), and suspensions of particles (e.g., polysulfide-based nanofluid), has attracted worldwide attention. The research on electrochemistry of fuel oxidation reaction and oxygen reduction reaction has made great progress. The development of direct liquid e-fuel cells will play an important role in the future of consumer electronics, electric vehicles, and stationary power plant.

Currently, direct liquid fuel cells (DLFCs) have received worldwide research interest as a promising energy conversion technology, primarily because unlike gaseous hydrogen, liquid fuels are energy dense and easy and safe to store and transport as gasoline. However, most of these developed DLFCs must use noble metal catalysts for liquid fuel oxidation reactions but yield limited fuel cell performance. Hence, as an alternative for liquid fuels, a great deal of research efforts is inspired toward direct liquid e-fuel cells. Recently, numerous works have been performed both experimentally and theoretically to expand our fundamental understanding and provide new insights into the electrochemistry of liquid e-fuel oxidation reaction and oxygen reduction reaction, the catalyst and membrane synthesis and modification, electrode fabrication and optimization, and fuel cell system designs of direct liquid e-fuel cells to understand the reaction pathways, improve the reaction kinetics, enhance the fuel cell durability, and reduce the system cost.

In this Research Topic on “Advances in the Electrochemistry of Direct Liquid e-Fuel Cells”, we would like to provide state-of-the-art achievements from fundamental to applications in direct liquid e-fuel cells. This Research Topic will cover fundamental aspects on mathematical modeling and simulation, newly developed characterization technologies, novel catalyst and membrane synthesis and modification, and innovative fuel cell system designs. We welcome short communications, original research papers, perspectives and review articles, which cover but not limit to the following topics:

• Mathematical modeling coupling the electrochemistry and physical processes
• Development of novel catalysts with high electrochemical activity
• Studies on liquid e-fuel oxidation mechanism and pathways
• Studies on electrode-electrolyte interface electrochemistry
• Development and optimization of novel fuel cell systems
• Development of advanced analysis and diagnosis technologies

Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.

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