Lignin-fueled photoelectrochemical platform for light-driven redox biotransformation

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The valorization of lignin has significant potential in producing commodity chemicals and fuels from renewable resources. However, the catalytic degradation of lignin is kinetically challenging and often requires noble metal catalysts to be used under harsh and toxic conditions. Here, we report the bias-free, solar reformation of lignin coupled with redox biotransformation in a tandem structure of a BiVO(4)photoanode and perovskite photovoltaic. The tandem structure compensates for the potential gap between lignin oxidation and biocatalytic reduction through artificialZ-schematic absorption. We found that the BiVO4-catalyzed photoelectrochemical oxidation of lignin facilitated the fragmentation of higher molecular weight lignin into smaller carboxylated aliphatic and aromatic acids. Lignin oxidation induced photocurrent generation at the photoanode, which enabled efficient electroenzymatic reactions at the cathode. This study successfully demonstrates the oxidative valorization of lignin as well as biocatalytic reductions (e.g., CO2-to-formate and alpha-ketoglutarate-to-l-glutamate) in an unbiased biocatalytic PEC platform, which provides a new strategic approach for photo-biocatalysis using naturally abundant renewable resources.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2020-08
Language
English
Article Type
Article
Citation

GREEN CHEMISTRY, v.22, no.15, pp.5151 - 5160

ISSN
1463-9262
DOI
10.1039/d0gc01521k
URI
http://hdl.handle.net/10203/281944
Appears in Collection
MS-Journal Papers(저널논문)
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