Open AccessEfficient Photoelectrochemical Energy Conversion using Spinach Photosystem II (PSII) in Lipid Multilayer Films
Author(s) -
Zhang Yun,
Magdaong Nikki M.,
Shen Min,
Frank Harry A.,
Rusling James F.
Publication year - 2015
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201402080
Subject(s) - photosystem ii , anode , photoelectrochemical cell , photosystem i , chemistry , oxygen evolution , cathode , photocurrent , photoelectrochemistry , plastoquinone , materials science , photochemistry , chemical engineering , electrolyte , electrochemistry , photosynthesis , thylakoid , optoelectronics , electrode , chloroplast , biochemistry , engineering , gene
The need for clean, renewable energy has fostered research into photovoltaic alternatives to silicon solar cells. Pigment–protein complexes in green plants convert light energy into chemical potential using redox processes that produce molecular oxygen. Here, we report the first use of spinach protein photosystem II (PSII) core complex in lipid films in photoelectrochemical devices. Photocurrents were generated from PSII in a ∼2 μm biomimetic dimyristoylphosphatidylcholine (DMPC) film on a pyrolytic graphite (PG) anode with PSII embedded in multiple lipid bilayers. The photocurrent was ∼20 μA cm −2 under light intensity 40 mW cm −2 . The PSII–DMPC anode was used in a photobiofuel cell with a platinum black mesh cathode in perchloric acid solution to give an output voltage of 0.6 V and a maximum output power of 14 μW cm −2 . Part of this large output is related to a five‐unit anode–cathode pH gradient. With catholytes at higher pH or no perchlorate, or using an MnO 2 oxygen‐reduction cathode, the power output was smaller. The results described raise the possibility of using PSII–DMPC films in small portable power conversion devices.