期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 45, 期 32, 页码 16060-16070出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.04.011
关键词
2D/2D interfaces; NiO/g-C3N4 hetero-Structures; Photo-electrochemical water overall water splitting; Solid-state heat treatment; Oxygen evolution reaction; Hydrogen evolution reaction
资金
- UGC
- SERB-DST, India [SB/FT/CS-047/2014]
Herein, we report a synthesis of 2D/2D interfaces between nickel/nickel oxide (Ni/NiO) hexagonal nanosheets with graphitic-carbon nitride (g-C3N4) using an in-situ solid-state heat treatment that shows enhanced activity for electrochemical as well as photo-electrochemical (PEC) water splitting. The transmission electron microscopy characterization confirms the homogenous dispersion of 2D hexagonal nanosheets of Ni/NiO on the surface of g-C3N4. The higher electrochemical and PEC water splitting activity of 2D/2D interface may be due to the more intimate contact between 2D sheets of NiO with g-C3N4. Moreover, the effect of NiO loading in nanoheterostructures have been studied towards by varying the ratio of precursors for NiO to that of g-C3N4 viz. 1:1, splitting 1:8, and 1:16. A compositional ratio of 1:8 have been found to show the best PEC activity towards OER depicting a maximum photocurrent density of 20 mA cm(-2) at an over potential of 190 mV. Whereas, the highest ratio of NiO to g-C3N4 nanosheets (i.e. 1:1) was noted to demonstrate the best performance towards electrochemical hydrogen evolution reaction showing dramatically reduced over potential of 26 mV to drive a current density of 10 mA cm(-2). (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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