TY - JOUR
T1 - 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
AU - Chang, Chia Wei
AU - Nurpratiwi, Anggrahini Arum
AU - Su, Yen Hsun
N1 - Funding Information:
This work was supported in part by the Ministry of Science and Technology, Taiwan , under Grants MOST-109-2221-E-006-024-MY3/109-2224-E-006-009/109-2224-E-006-007 , Precision Instruments Center in National Sun Yat-sen University (FEI EO Tecnai F20 G 2 field-emission transmission electron microscope).
Publisher Copyright:
© 2021 Hydrogen Energy Publications LLC
PY - 2022/12/12
Y1 - 2022/12/12
N2 - 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), Ca2Nan-3NbnO3n+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 ɳ up to 0.110% when applied to the PEC device.
AB - 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), Ca2Nan-3NbnO3n+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 ɳ up to 0.110% when applied to the PEC device.
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U2 - 10.1016/j.ijhydene.2021.07.227
DO - 10.1016/j.ijhydene.2021.07.227
M3 - Article
AN - SCOPUS:85113698235
SN - 0360-3199
VL - 47
SP - 40573
EP - 40581
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 96
ER -