TY - JOUR
T1 - Dual-Function Electrocatalytic and Macroporous Hollow-Fiber Cathode for Converting Waste Streams to Valuable Resources Using Microbial Electrochemical Systems
AU - Katuri, Krishna
AU - Kalathil, Shafeer
AU - Ragab, Alaa I.
AU - Bian, Bin
AU - AlQahtani, Manal Faisal
AU - Pant, Deepak
AU - Saikaly, Pascal
N1 - KAUST Repository Item: Exported on 2021-02-19
Acknowledged KAUST grant number(s): FCC/1/1971-05-01, URF/1/2985-01-01
Acknowledgements: K.P.K. and S.K. contributed equally to this work. This work was supported by the Center Competitive Funding Program (Grant No. FCC/1/1971-05-01) and the Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology (KAUST). Figures were created by Xavier Pita (Figures 2, 7, and 12), Ivan Gromicho (Figures 5 and 8, and ToC image), and Heno Hwang (Figure 4 and ToC image), scientific illustrators at KAUST. The authors thank Srikanth Pedireddy, a Postdoctoral Fellow in the WDRC at KAUST, for modifying Figure 3 and generating Figures 1 and 6 in this manuscript.
PY - 2018/4/30
Y1 - 2018/4/30
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/627745
UR - https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201707072
UR - http://www.scopus.com/inward/record.url?scp=85046105584&partnerID=8YFLogxK
U2 - 10.1002/adma.201707072
DO - 10.1002/adma.201707072
M3 - Article
C2 - 29707854
AN - SCOPUS:85046105584
VL - 30
SP - 1707072
JO - Advanced Materials
JF - Advanced Materials
SN - 0935-9648
IS - 26
ER -