Effect of sulfur vacancies on the nitrogen photofixation performance of ternary metal sulfide photocatalysts
CATALYSIS SCIENCE & TECHNOLOGY(2016)
Abstract
Nitrogen fixation is the second most important chemical process in nature next to photosynthesis. Herein, we report a novel ternary metal sulfide photocatalyst Zn0.1Sn0.1Cd0.8S with outstanding nitrogen photofixation ability under visible light. Characterization results indicate that the actual atomic ratio of the as-prepared ternary metal sulfide is Zn : Sn : Cd : S of 0.11 : 0.12 : 0.88: 1.12 with many sulfur vacancies, not a mixture of ZnS, SnS2 and CdS. The sulfur vacancies on Zn0.1Sn0.1Cd0.8S not only serve as active sites to adsorb and activate N-2 molecules but also promote interfacial charge transfer from Zn0.1Sn0.1Cd0.8S to N-2 molecules, thus significantly improving the nitrogen photofixation ability. The other three as-prepared ternary metal sulfides with sulfur vacancies fabricated via the same method exhibit nitrogen photofixation ability, confirming the significantly important role of sulfur vacancies in the nitrogen photofixation process.
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Key words
ternary metal sulfide photocatalysts,nitrogen photofixation performance,sulfur vacancies
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