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    Efficient solar-to-acetate conversion from CO2 through microbial electrosynthesis coupled with stable photoanode

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    Extremely solar.pdf
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    2.179Mb
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    Type
    Article
    Authors
    Bian, Bin cc
    Shi, Le cc
    Katuri, Krishna
    Xu, Jiajie
    Wang, Peng cc
    Saikaly, Pascal cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Biotechnology Research Group
    Environmental Nanotechnology Lab
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    URF/1/2985-01-01
    Date
    2020-08-19
    Online Publication Date
    2020-08-19
    Print Publication Date
    2020-11
    Embargo End Date
    2022-08-19
    Submitted Date
    2020-04-05
    Permanent link to this record
    http://hdl.handle.net/10754/664945
    
    Metadata
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    Abstract
    Integration of microbial electrosynthesis (MES) with renewable energy supply has been proposed as a novel approach for energy storage and CO2 transformation into fuels and chemicals. However, the efficiency of renewable energy conversion into biochemicals is yet to be improved in MES. In this study, molybdenum-doped bismuth vanadate was deposited on fluorine-doped tin oxide glass (FTO/BiVO4/Mo) to serve as MES photoanode for efficient solar energy harvesting and reduction of overpotential for oxygen evolution reaction (OER). By applying a fixed bias of 3 V to MES systems under 0.5 sun illumination, a more negative cathode potential (–0.72 ± 0.03 V vs. SHE versus –0.38 ± 0.03 V vs. SHE in the dark) was achieved owing to the reduced OER overpotential at FTO/BiVO4/Mo photoanode, which led to a 25% increase in current density and 46-fold increase in acetate production rate. Higher electron recovery (~62%) and excellent stability (7 days) were also observed in MES reactors with sun illumination on FTO/BiVO4/Mo photoanode. Based on acetate production and energy input from simulated sunlight, 0.97 ± 0.19% solar energy was theoretically converted into acetate, which is one of the highest conversion efficiencies ever reported in hybrid MES systems. These results demonstrate that integrating FTO/BiVO4/Mo photoanode with MES systems could significantly enhance the solar-to-biochemical conversion efficiency by lowering the energy requirement for initiating the anodic OER and maintaining the negative cathode potential, which enables MES technology to be economically more viable for renewable energy storage and CO2 valorization.
    Citation
    Bian, B., Shi, L., Katuri, K. P., Xu, J., Wang, P., & Saikaly, P. E. (2020). Efficient solar-to-acetate conversion from CO2 through microbial electrosynthesis coupled with stable photoanode. Applied Energy, 278, 115684. doi:10.1016/j.apenergy.2020.115684
    Sponsors
    This work was supported by the Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology (KAUST). We thank Renyuan Li, a PhD student in Water Desalination and Reuse Center at KAUST, for helping with the setup of the light illumination system.
    Publisher
    Elsevier BV
    Journal
    Applied Energy
    DOI
    10.1016/j.apenergy.2020.115684
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0306261920311818
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.apenergy.2020.115684
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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