Dual‐Function Electrocatalytic and Macroporous Hollow‐Fiber Cathode for Converting Waste Streams to Valuable Resources Using Microbial Electrochemical Systems. Issue 26 (30th April 2018)

• Record Type: Journal Article
• Authors: Katuri, Krishna P.; Kalathil, Shafeer; Ragab, Ala'a; Bian, Bin; Alqahtani, Manal F.; Pant, Deepak; Saikaly, Pascal E.
• Is Part Of: Advanced materials. Volume 30:Issue 26(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-04-30
• Subjects: artificial photosynthesis -- CO2 reduction -- electrically conductive porous membranes -- electrochemical membrane bioreactor -- microbial electrosynthesis; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201707072
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Dual‐function electrocatalytic and macroporous hollow‐fiber cathodes are recently proposed as promising advanced material for maximizing the conversion of waste streams such as wastewater and waste CO2 to valuable resources (e.g., clean freshwater, energy, value‐added chemicals) in microbial electrochemical systems. The first part of this progress report reviews recent developments in this type of cathode architecture for the simultaneous recovery of clean freshwater and energy from wastewater. Critical insights are provided on suitable materials for fabricating these cathodes, as well as addressing some challenges in the fabrication process with proposed strategies to overcome them. The second and complementary part of the progress report highlights how the unique features of this cathode architecture can solve one of the intrinsic bottlenecks (gas–liquid mass transfer limitation) in the application of microbial electrochemical systems for CO2 reduction to value‐added products. Strategies to further improve the availability of CO2 to microbial catalysts on the cathode are proposed. The importance of understanding microbe–cathode interactions, as well as electron transfer mechanisms at the cathode–cell and cell–cell interface to better design dual‐function macroporous hollow‐fiber cathodes, is critically discussed with insights on how the choice of material is important in facilitating direct electron transfer versus mediated electron transfer. Abstract : Electrocatalytic and macroporous hollow‐fiber cathodes for converting waste streams (e.g., wastewater and CO2 ) to valuable resources (clean water, energy, and value‐added products) are reviewed.