Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 7, Pages 6367-6375Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c00747
Keywords
two-dimensional perovskite; solar water splitting; hydrogen generation; renewable energy; first-principles calculation; Dion-Jacobson phase
Funding
- Ministry of Science and Technology, Taiwan [MOST-108-2221-E-006-138, MOST-105-2221-E-006-206-MY3, MOST-108-2218-E-006-024, MOST-108-2218-E-006-023]
- Precision Instruments Center in National Sun Yat-sen University
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A well-crystalline two-dimensional (2D) perovskite material, Ca2Nan-3NbnO3n+1- (CNNO-) nanosheets, derived from the Dion-Jacobson phase has the potential to generate hydrogen through photoelectrochemical water splitting. Here, we demonstrate that a high-kappa photovoltaic electrode consisting of CNNO- nanosheets with layer number n = 4-6 and a hole-transport polymer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), can form a p-n junction and an overall solar-to-hydrogen water-splitting cell, with the highest efficiency of 0.52% and a hydrogen evolution rate of 80.64 mu mol h(-1). First-principles calculations are carried out to confirm the energy-band diagram of this promising material, which significantly affects the electronic transition process in a solar water-splitting cell. 2D CNNO- nanosheets present great potential for serving as nanoelectronic water-splitting devices in single transistors.
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