Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 226, Issue -, Pages 412-420Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.12.064
Keywords
CoO nanoparticles; g-C3N4; Photothermal deactivation; H2O2-resisitence poisoning; Overall water splitting
Funding
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- National Natural Science Foundation of China [51725204, 21771132, 51422207, 51572179, 21471106, 21501126]
- Natural Science Foundation of Jiangsu Province [BK20161216]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Photocatalytic hydrogen production from overall water splitting is a clean and renewable technology that can convert solar energy into chemical energy, for which developing an efficient and stable photocatalyst has been the central scientific topic. Herein, CoO/g-C3N4 heterojunction photocatalysts were fabricated through a facile solvothermal method for overall water splitting. Simultaneous evolution of H-2 and O-2 from pure water with the stoichiometric ratio of about 2:1 achieved with all the CoO/g-C3N4 heterojunctions as catalysts under visible light irradiation. Among of them, 30 wt.% CoO/g-C3N(4) with H-2 evolution rate of 2.51 mu mol/h and O-2 evolution rate of 1.39 mu mol/h also exhibited remarkably higher photocatalytic performance and stability (over 15 cycles) than single CoO or g-C3N4. This enhanced photocatalytic activity of CoO/g-C3N4 heterojunction can be ascribed to the synergistic effect of junction and interface formed between CoO and g-C3N4. In addition, the sufficient long lifetime stability of CoO/g-C3N4 comes from the complementary advantages effect between CoO and g-C3N4, as is proved, COO can protect g-C3N4 from H2O2 poisoning, and simultaneously the photo-induced heat from CoO during the photocatalytic process responsible for the rapid deactivation can be timely conducted to g-C3N4.
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