Journal
ACS ENERGY LETTERS
Volume 4, Issue 1, Pages 293-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b01661
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Funding
- Argonne-Northwestern Solar Energy Research (ANSER) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-5C0001059]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Future Resource Program, Korea Institute of Science and Technology (KIST) [2E28070]
- Ministry of Science & ICT (MSIT), Republic of Korea [2E28070] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Although solution-processable halide perovskite semiconductors exhibit optoelectronic performance comparable to the best photoabsorbers for solar fuel production, halide perovskites rapidly decompose in the presence of water or even humid air. We show that a hybrid electron transport layer, a PC61BM + TiO2 film (18-40 nm thickness) grown over the sensitive absorber by atomic layer deposition, enables photoassisted proton reduction without further encapsulation. These semitransparent photocathodes, when paired with a Pt catalyst, display continuous reduction of H+ to H-2 for hours under illumination, even while in direct contact with a strongly acidic aqueous electrolyte (0.5 M H2SO4). Under 0.5 Sun illumination, a photocurrent density of >10 mA cm(-2) is observed, and a photovoltage of 0.68 V assists proton reduction, consistent with a structurally related photovoltaic (PV) device. Submersible halide perovskite photoelectrodes point the way to more efficient photoassisted overall water splitting and other solar fuel generation using solution-processed semiconductors with tunable band gaps.
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