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Title: Molecular Coatings Improve the Selectivity and Durability of CO2 Reduction Chalcogenide Photocathodes

Journal Article · · ACS Energy Letters

The quest for solar-driven conversion of carbon dioxide to chemicals and fuels hinges upon the identification of an efficient, durable, and selective photocathode. Chalcogenide p-type semiconductors exemplified by chalcopyrite Cu(In,Ga)Se2 (CIGS) have been effectively deployed as photocathodes. However, selectivity toward CO2 reduction and durability of the commonly used CdS adlayer remain primary challenges. Here, we demonstrate that for the wide band gap CuGa3Se5 chalcopyrite absorber these challenges are well addressed by an organic coating generated in situ from an N,N'-(1,4-phenylene)bispyridinium ditriflate salt in the electrolyte. The molecular additive provides a 30-fold increase in selectivity toward CO2R products compared to the unmodified system and lowers Cd corrosion at least 10-fold. This dual functionality highlights the promise of hybrid solid-state-molecular photocathodes for enabling durable and efficient solar fuel systems.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S. Department of Energy
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1860329
Report Number(s):
NREL/JA-5K00-81932; MainId:82705; UUID:3e66f44d-0fc0-4d6b-8dc8-3228877d8ae7; MainAdminID:64122
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 3 Vol. 7; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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