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Ultrafast Electron Transfer in Au-Cyanobacteria Hybrid for Solar to Chemical Production

Journal Article · · ACS Energy Letters

The rise of inorganic-biohybrid organisms for solar-to-chemical production has spurred mechanistic investigations into the dynamics of the biotic-abiotic interface to drive the development of next-generation hybrid systems. The model system, cyanobacteria-gold nanoparticle hybrids, combines a light harvester with a photosynthetic bacterium to drive the reduction of CO2 to glycerol with improved efficiency and increased glycerol production by 14.6%, in comparison to cyanobacteria only. In this work, we report insights into this unique photochemical behavior and propose a charge-transfer pathway from Au nanoparticle to cyanobacteria. Transient absorption (TA) spectroscopy revealed that photoexcited electron transfer rates are on the order of a few ps to the potential electron acceptor in photosystem II. This work represents a promising platform to utilize a conventional spectroscopic methodology to extract insights from more complex biotic-abiotic hybrid systems.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Division of Chemical Sciences, Geosciences, and Biosciences, Solar Photochemistry Program
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1922098
Report Number(s):
NREL/JA-5900-83617; MainId:84390; UUID:0e21200f-871b-4f4e-8e27-cc8ba3fc1cd1; MainAdminID:68550
Journal Information:
ACS Energy Letters, Vol. 8, Issue 1
Country of Publication:
United States
Language:
English

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