Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 31, Pages 16575-16581Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.04.192
Keywords
NiO; Phosphonic acid; Surface modification; Photocatalytic H-2 evolution; Interfacial property
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Funding
- National Natural Science Foundation of China [21333006, 21573135, U1832145, 11374190, 51321091, 51602179]
- Taishan Scholar Foundation of Shandong Province, China
- Young Scholars Program [2016WLJH16]
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Enhancing the photocatalytic activity of NiO towards hydrogen generation (6 times) is achieved by phenyl phosphoric acid (PPA) surface modification. The photocatalytic activity can be further improved by changing PPA to 4-aminophenyl phosphonic acid (PPA-NH2), about 10 times, suggesting the functional group plays an important role in improving the activity. A chemical bond (Ni-O-P) between NiO and organic phosphoric acid was proved by FT-IR spectra. XPS and LSV analysis suggested organic phosphonic acid modification increased the electron density of Ni, which promoted the transformation from Ni2+ to Ni-0. Mott-Schottky (M - S) measurement revealed that PPA-NH2 modified NiO processed a larger the space charge layer thickness (d(sc)), which enhanced ability towards H-2 evolution from dynamical aspect. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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