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Lukic S, Busser GW, Zhang S, Menze J, Muhler M, Scheu C, Winterer M. Nanocrystalline Ga–Zn Oxynitride Materials: Minimized Defect Density for Improved Photocatalytic Activity? Z PHYS CHEM 2019. [DOI: 10.1515/zpch-2019-1432] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
We present an alternative synthesis strategy for developing nanocrystalline (Ga1−xZnx)(N1−xOx) semiconductors known to be very efficient photoabsorbers. In a first step we produce mixtures of highly crystalline β-Ga2O3 and wurtzite-type ZnO nanoparticles by chemical vapor synthesis. (Ga1−xZnx)(N1−xOx) nanoparticles of wurtzite structure are then formed by reaction of these precursor materials with ammonia. Microstructure as well as composition (zinc loss) changes with nitridation time: band gap energy, crystallite size and crystallinity increase, while defect density decreases with increasing nitridation time. Crystallite growth results in a corresponding decrease in specific surface area. In the UV regime photocatalytic activity for overall water splitting can be monitored for samples both before and after nitridation. We find a significantly lower photocatalytic activity in the nitrided samples, even though the crystallinity is significantly higher and the defect density is significantly lower after nitridation. Both properties should have led to a lower probability for charge carrier recombination, and, consequently, to a higher photocatalytic activity.
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Affiliation(s)
- Sasa Lukic
- Nanoparticle Process Technology (NPPT) and Center for Nanointegration Duisburg-Essen (CENIDE) , University of Duisburg-Essen , 47057 Duisburg , Germany
| | | | - Siyuan Zhang
- Max-Planck-Institut für Eisenforschung GmbH , 40237 Düsseldorf , Germany
| | - Jasper Menze
- Laboratory of Industrial Chemistry , Ruhr-University Bochum , 44780 Bochum , Germany
| | - Martin Muhler
- Laboratory of Industrial Chemistry , Ruhr-University Bochum , 44780 Bochum , Germany
| | - Christina Scheu
- Max-Planck-Institut für Eisenforschung GmbH , 40237 Düsseldorf , Germany
| | - Markus Winterer
- Nanoparticle Process Technology (NPPT) and Center for Nanointegration Duisburg-Essen (CENIDE) , University of Duisburg-Essen , 47057 Duisburg , Germany
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Enhanced photochemical oxidation ability of carbon nitride by π–π stacking interactions with graphene. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(16)62561-5] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Plasma methods for preparing green catalysts: Current status and perspective. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(15)61020-8] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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