Journal
CHEMSUSCHEM
Volume 13, Issue 11, Pages 2940-2944Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000459
Keywords
artificial photosynthesis; CO2 reduction; copper; photobiocatalysis; solar fuels
Funding
- National Research Foundation (NRF) via the Creative Research Initiative Center, Republic of Korea [NRF-2015R1A3A2066191]
- National Research Foundation (NRF) via the Global Ph.D. Fellowship Program, Republic of Korea [NRF-2019H1A2A1075810]
- National Research Foundation of Korea [2019H1A2A1075810] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Green plants convert sunlight into high-energy chemicals by coupling solar-driven water oxidation in the Z-scheme and CO2 fixation in the Calvin cycle. In this study, formate dehydrogenase from Clostridium ljungdahlii (ClFDH) is interfaced with a TiO2-coated CuFeO2 and CuO mixed (ClFDH-TiO2|CFO) electrode. In this biohybrid photocathode, the TiO2 layer enhances the photoelectrochemical (PEC) stability of the labile CFO photocathode and facilitates the transfer of photoexcited electrons from the CFO to ClFDH. Furthermore, inspired by the natural photosynthetic scheme, the photobiocathode is combined with a water-oxidizing, FeOOH-coated BiVO4 (FeOOH|BiVO4) photoanode to assemble a wireless Z-scheme biocatalytic PEC device as a semi-artificial leaf. The leaf-like structure effects a bias-free biocatalytic CO2-to-formate conversion under visible light. Its rate of formate production is 2.45 times faster than that without ClFDH. This work is the first example of a wireless solar-driven semi-biological PEC system for CO2 reduction that uses water as an electron feedstock.
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