A comparison study of molten-salt and solid-state method for the photoelectrochemical water splitting performance of Dion-Jacobson layers perovskite Ca2Nan-3NbnO3n+1- (n=4, 5, and 6) nanosheets

Solar energy is one of the elements that have been used as a resource in the green energy field. Hydrogen, as an energy carrier, can be produced from many kinds of sources, including solar energy. Here, we present two-dimensional (2D)perovskite material derived from the Dion-Jacobson phase (DJ), Ca(2)Na(n-3)NbnO(3n+1)-(CNNO-) nanosheets, with the number of layer n = 4-6 synthesized via microwave-assisted hydrothermal method. The starting material KCa2Nb3O10 (KCNO) is made from two methods. The solid-state calcination KCNO product has more than two-phase, while the molten-salt synthesis produces a well cubic KCNO crystalline. TThe thickness of the 2D CNNO- nanosheets is increasing, in dependence on the n value. Meanwhile, the estimated optical band gap is decreasing, in dependence on the n value. 2D CNNO- nanosheets show the absorbance under ultraviolet (UV) light, which confirms their semiconducting nature. The capability of these 2D nanosheets to generate hydrogen is presented via photo-electrochemical (PEC) water splitting. The molten-salt fabricated CNNO- nanosheets CNNO6 shows better performance with the highest efficiency. up to 0.110% when applied to the PEC device. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In this study, two-dimensional CNNO- nanosheets derived from perovskite material were synthesized via a microwave-assisted hydrothermal method. The nanosheets showed semiconducting properties and the ability to generate hydrogen through photo-electrochemical water splitting.