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Issue 15, 2020
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Lignin-fueled photoelectrochemical platform for light-driven redox biotransformation

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Abstract

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 BiVO4 photoanode and perovskite photovoltaic. The tandem structure compensates for the potential gap between lignin oxidation and biocatalytic reduction through artificial Z-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 α-ketoglutarate-to-L-glutamate) in an unbiased biocatalytic PEC platform, which provides a new strategic approach for photo-biocatalysis using naturally abundant renewable resources.

Graphical abstract: Lignin-fueled photoelectrochemical platform for light-driven redox biotransformation

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Supplementary files

Article information


Submitted
04 May 2020
Accepted
06 Jul 2020
First published
08 Jul 2020

Green Chem., 2020,22, 5151-5160
Article type
Paper

Lignin-fueled photoelectrochemical platform for light-driven redox biotransformation

D. Wang, S. H. Lee, S. Han, J. Kim, N. V. T. Trang, K. Kim, E. Choi, P. Boonmongkolras, Y. W. Lee, B. Shin, Y. H. Kim and C. B. Park, Green Chem., 2020, 22, 5151
DOI: 10.1039/D0GC01521K

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