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Title: Photoelectrochemical NADH Regeneration using Pt-Modified p -GaAs Semiconductor Electrodes

Journal Article · · ChemElectroChem

Abstract Cofactor regeneration in enzymatic reductions is crucial for the application of enzymes to both biological and energy‐related catalysis. Specifically, regenerating NADH from NAD + is of great interest, and using electrochemistry to achieve this end is considered a promising option. Here, we report the first example of photoelectrochemical NADH regeneration at the illuminated (λ>600 nm), metal‐modified, p ‐type semiconductor electrode Pt/ p ‐GaAs. Although bare p ‐GaAs electrodes produce only enzymatically inactive NAD 2 , NADH was produced at the illuminated Pt‐modified p ‐GaAs surface. At low overpotential (−0.75 V vs. Ag/AgCl), Pt/ p ‐GaAs exhibited a seven‐fold greater faradaic efficiency for the formation of NADH than Pt alone, with reduced competition from the hydrogen evolution reaction. Improved faradaic efficiency and low overpotential suggest the possible utility of Pt/ p ‐GaAs in energy‐related NADH‐dependent enzymatic processes.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0002133; DGE-1148900
OSTI ID:
1418016
Alternate ID(s):
OSTI ID: 1401746
Journal Information:
ChemElectroChem, Vol. 4, Issue 5; ISSN 2196-0216
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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