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

Chia Wei Chang, Anggrahini Arum Nurpratiwi, Yen Hsun Su

研究成果: Article同行評審

摘要

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.

原文English
期刊International Journal of Hydrogen Energy
DOIs
出版狀態Accepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 燃料技術
  • 凝聚態物理學
  • 能源工程與電力技術

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