Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10154633 | International Journal of Hydrogen Energy | 2018 | 12 Pages |
Abstract
l-cysteine was used as sulfur source for the preparation of Zn0.5Cd0.5S solid solutions with different morphology and crystal structure (wurtzite, zinc blende/wurtzite (Z/W) phase junctions, twin crystal). The morphology and crystal structure could be tuned by changing the reaction conditions, especially the solvents. In a mixed solvent of ethanolamine and water, nanorods with pure wurtzite structure were formed due to the capping effect of ethanolamine. If pure water was used as solvent, nanotetrahedrons with zinc blende/wurtzite (Z/W) phase junction structures can be prepared. In a mixed solvent of ethanediamine and water, nanospheres with high density of twin crystal structures were formed. The different crystal structures were revealed by electron dispersive spectrum (EDS), X-ray diffraction (XRD) experiments, transmission electron microscopy (TEM), and scan electron microscopy (SEM) for the nanorods, nanotetrahedrons, and nanospheres. Because of the existence of high density homojunction structures (Z/W junction and twin crystal), both nanotetrahedrons and nanospheres showed excellent photocatalytic activity for H2 evolution from sacrificial reagent aqueous solutions. Especially, the nanospheres presented a H2 production rate of about 0.8350 mmol hâ1 over 10 mg catalyst, corresponding to a QEs of 47.52%, in 0.75 M Na2S and 1.05 M Na2SO3 aqueous solutions under visible light (λ â¥Â 420 nm) irradiation.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jingang Song, Ranran Sun, Yanli Chen, Dejun Sun, Xiyou Li,