期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 25, 页码 13467-13475出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp503155c
关键词
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资金
- University of Texas-Pan American
- American Chemical Society - Petroleum Research Fund [51497]
- Air Force Office of Scientific Research [FA9550-12-1-0159]
- Defense Threat Reduction Agency (DTRA) of the U.S. Department of Defense [HDTRA1-10-1-0114]
- Defense Advanced Research Projects Agency [W31P4Q-12-1-009]
- Welch Foundation [BG-0017]
- National Science Foundation under DMR [0934157]
- DMR MRI [1040419]
In an effort to replace conventional multistep seeding methods to produce multidimensional ZnO nanostructures with high spatial occupancy of nanowires (NWs), a rational and facile synthesis protocol for caterpillar-like branched ZnO nanofibers (BZNs) is reported. This process combined the scalable forcespinning technology with a hydrothermal process to efficiently develop BZNs to substantially enhance surface area and roughness factor. Specifically, unbranched ZnO nanofibers were first prepared by spinning polyvinylpyrrolidone (PVP)/zinc nitrate hexahydrate (Zn(NO3)(2)center dot 6H(2)O) composite fibers, followed by calcination at 500 degrees C. These fibers were deposited on flat substrates to serve as nonwoven netlike seed sites for hydrothermal growth of ultradense and uniform NW branches to form caterpillar-like BZNs. Their usage as photoanodes in photoelectrochemical water-splitting cells was evaluated, resulting in a photon-to-hydrogen conversion efficiency of 0.165%, an enhancement of 147% when compared to ZnO NW arrays with similar dimensions. An enhanced light-harvesting process coupled with a facile and scalable synthetic procedure is presented.
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