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Copper-Modified TiO2 and ZrTiO4: Cu Oxidation State Evolution during Photocatalytic Hydrogen Production
被引:54
|作者:
Polliotto, Valeria
[1
,2
]
Livraghi, Stefano
[1
,2
]
Krukowska, Anna
[3
]
Dozzi, Maria Vittoria
[4
]
Zaleska-Medynska, Adriana
[3
]
Selli, Elena
[4
]
Giamello, Elio
[1
,2
]
机构:
[1] Univ Torino, Dipartimento Chim, Via P Giuria 7, I-10125 Turin, Italy
[2] Univ Torino, NIS, Via P Giuria 7, I-10125 Turin, Italy
[3] Univ Gdansk, Fac Chem, Dept Environm Technol, PL-80308 Gdansk, Poland
[4] Univ Milan, Dipartimento Chim, Via Golgi 19, I-20133 Milan, Italy
关键词:
copper;
Cu2O;
Cu2+;
HER;
EPR;
TiO2;
ZrTiO4;
ELECTRON-PARAMAGNETIC-RESONANCE;
TEMPERATURE METHANOL SYNTHESIS;
VISIBLE-LIGHT;
H-2;
PRODUCTION;
TITANIUM-DIOXIDE;
NANOWIRE ARRAYS;
CARBON-DIOXIDE;
THIN-FILMS;
DOPED TIO2;
WATER;
D O I:
10.1021/acsami.8b05528
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
In the present work, two H-2 evolution photo catalysts were prepared by employing two different oxides, TiO2 and zirconium titanate (ZrTiO4), as the support of various copper phases. For both the supports the same Cu loading (0.5% w/w) was adopted, but two different impregnation procedures have been followed, leading to different forms of Cu in the final composite material that are: (i) Cu(II) species dispersed on the oxide surface and (ii) Cu2O particles dispersed on the oxide surface. The present paper based on the parallel use of photocatalytic test and spectroscopic analysis performed in catalytic conditions illustrates the evolution of photocatalytic systems occurring during the H-2 evolution reaction tests, pointing out that the as-prepared materials represent a pre catalyst and they are modified during irradiation leading to the real working systems different from the starting ones. The herein presented spectroscopic analysis aims to contribute to the living debate on the oxidation state of copper in mixed Cu/oxide materials and on its role in hydrogen evolution under photocatalytic conditions.
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页码:27745 / 27756
页数:12
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