Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 16, Pages 13841-13849Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5032083
Keywords
hierarchical structure; core-shell; ZnIn2S4; carbon nanofiber; composites; photocatalytic hydrogen evolution
Funding
- National Natural Science Foundation of China [21031001, 51272070, 91122018, 20971040, 21371053]
- Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China [708029]
- Program for Innovative Research Team in University [IRT-1237]
- Natural Science Foundation of Heilongjiang Province of China [E201455]
- Special Research Fund for the Doctoral Program of Higher Education of China [20112301110002]
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Improvement of hydrogen evolution ability is an urgent task for developing advanced catalysts. As one of the promising visible-light photocatalysts, ZnIn2S4 suffers from the ultrafast recombination of photoinduced charges, which limits its practical application for efficient solar water splitting. Herein, we reported a two-step method to prepare hierarchical core-shell carbon nanofiber@ZnIn2S4 composites. One-dimensional carbon nanofibers were first prepared by electrospinning and carbonization in N-2. The subsequent solvothermal process led to the in situ growth of ZnIn2S4 nanosheets on the carbon nanofibers to fabricate hierarchical structure composites. The hierarchical core-shell configuration structure can help to form an intimate contact between the ZnIn2S4 nanosheet shell and the carbon nanofiber backbone compared with the equivalent physical mixture and can facilitate the interfacial charge transfer driven by the excitation of ZnIn2S4 under visible-light irradiation. Meanwhile, the ultrathin ZnIn2S4 nanosheets were uniformly grown on the surface of the carbon nanofibers, which can avoid agglomeration of ZnIn2S4. These synergistic effects made this unique hierarchical structure composite exhibit a significantly higher visible-light photocatalytic activity toward hydrogen evolution reaction compared with pure ZnIn2S4 or a physical mixture of ZnIn2S4 and carbon nanofibers in the absence of noble metal cocatalysts.
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