Journal
CHEMICAL ENGINEERING JOURNAL
Volume 362, Issue -, Pages 392-401Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.01.021
Keywords
NiCo2O4; Hydrogen evolution; Bimetallic complex; Photocatalysis
Categories
Funding
- National Natural Science Foundation of China [21676213, 21476183, 51372201]
- China Postdoctoral Science Foundation [2016M600809]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM2026]
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Herein, ternary nickel cobalt oxide (NiCo2O4) was firstly employed to increase the photocatalytic water reduction ability of g-C3N4. 17.5 wt%-NiCo2O4/g-C3N4 shows excellent water splitting performance with a H-2 production rate of 5480 mu mol h(-1) g(-1), which is extremely better than that of Co3O4, NiO, Pt modified g-C3N4. The quantum efficiency of 17.5 wt%-NiCo2O4/g-C3N4 can reach 4.5% under 400 (+/- 7.5) nm light irradiation. The greatly increased activity of 17.5 wt%-NiCo2O4/g-C3N4 can be attributed to the richer active sites and the superior electrical performance provided by co-existing nickel and cobalt ions with multivalent state. Moreover, the activity of composite almost shows no significant weaken even after 20 h irradiation. A Z-scheme route was put forwarded for H-2 production over NiCo2O4/g-C3N4 instead of the traditional p-n junction based on our study.
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