Journal article

Publication year: 2018

Pages: 349-355

Journal: Applied Catalysis B: Environment and Energy

Volume number: 227

ISSN: 0926-3373

eISSN: 1873-3883

DOI Link: https://doi.org/10.1016/j.apcatb.2018.01.039

Publisher: Elsevier

Abstract: 
Layered cesium copper titanate as well as the unmodified cesium titanate Cs0.68Ti1.83 square O-0.17(4) (square: vacancy) were synthesized by a solution-based approach. The insertion of small amounts of copper into the vacancies of Cs0.68Ti1.83 square O-0.17(4) led to a significant red shift of the band gap energy from 3.4 eV to 2.9 eV. During photo catalytic H2 production experiments, a steady increase in the evolution rate was detected, which can be referred to the in-situ reduction of incorporated copper ions to metallic Cu. The reduced copper ions leach out of the lattice to the catalyst surface and act as co-catalyst for H2 formation, considerably exceeding the activity achieved with Cs0.68Ti1.83 square O-0.17(4) modified with 0.075 wt.-% of Rh as co-catalyst. The use of diffuse reflectance spectroscopy enabled a direct measurement of the copper nanoparticle formation by following their rising plasmon resonance at operating conditions. Characterization by X-ray diffraction (XRD) revealed a significant change in the crystal structure upon photocatalysis.

Harvard Citation style: Pilarski, M., Marschall, R., Gross, S. and Wark, M. (2018) Layered cesium copper titanate for photocatalytic hydrogen production, Applied Catalysis B: Environment and Energy, 227, pp. 349-355. https://doi.org/10.1016/j.apcatb.2018.01.039

APA Citation style: Pilarski, M., Marschall, R., Gross, S., & Wark, M. (2018). Layered cesium copper titanate for photocatalytic hydrogen production. Applied Catalysis B: Environment and Energy. 227, 349-355. https://doi.org/10.1016/j.apcatb.2018.01.039