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Construction of photobiocathodes using multi‐walled carbon nanotubes and photosystem I
Author(s) -
Ciornii Dmitri,
Feifel Sven Christian,
Hejazi Mahdi,
Kölsch Adrian,
Lokstein Heiko,
Zouni Athina,
Lisdat Fred
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700017
Subject(s) - photocurrent , materials science , electrode , carbon nanotube , photosystem i , photosystem ii , nanotechnology , carbon fibers , optoelectronics , photochemistry , chemical engineering , chemistry , photosynthesis , composite number , composite material , biochemistry , engineering
In this work, we report on the successful assembly of cyanobacterial photosystem I (PSI) on carbon nanotubes for light‐to‐current conversion applications. For this purpose, glassy carbon electrodes (GCE) have been modified with multi‐walled carbon nanotubes (MWCNTs). The surface of the MWCNTs has been adjusted in a non‐invasive way by the use of a carboxylated pyrene derivative to achieve a covalent fixation of PSI. Our results show a cathodic photocurrent response and functionality of the biohybrid electrode upon illumination. The experiments verify that the photocurrent generation can clearly be attributed to a functional PSI on the electrode interface. An additional implementation of cytochrome c (cyt c ) into this electrode architecture results in a 25‐fold enhancement of cathodic photocurrent response (0.8 to 18 μA cm −2 at −100 mV and 100 mW cm −2 ), which can be attributed to an improved connection of PSI with the underlying electrode.