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CO 2 ‐Reductive, Copper Oxide‐Based Photobiocathode for Z‐Scheme Semi‐Artificial Leaf Structure
Author(s) -
Kuk Su Keun,
Jang Jinha,
Kim Jinhyun,
Lee Youngjun,
Kim Young Sin,
Koo Bonhyeong,
Lee Yang Woo,
Ko Jong Wan,
Shin Byungha,
Lee JungKul,
Park Chan Beum
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000459
Subject(s) - photocathode , artificial photosynthesis , formate , oxidizing agent , water splitting , materials science , electron transfer , chemical engineering , electrochemistry , electrode , chemistry , photocatalysis , photochemistry , catalysis , electron , physics , organic chemistry , quantum mechanics , engineering
Green plants convert sunlight into high‐energy chemicals by coupling solar‐driven water oxidation in the Z‐scheme and CO 2 fixation in the Calvin cycle. In this study, formate dehydrogenase from Clostridium ljungdahlii (ClFDH) is interfaced with a TiO 2 ‐coated CuFeO 2 and CuO mixed (ClFDH–TiO 2 |CFO) electrode. In this biohybrid photocathode, the TiO 2 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 BiVO 4 (FeOOH|BiVO 4 ) photoanode to assemble a wireless Z‐scheme biocatalytic PEC device as a semi‐artificial leaf. The leaf‐like structure effects a bias‐free biocatalytic CO 2 ‐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 CO 2 reduction that uses water as an electron feedstock.