Haisch Christoph, Schneider Jenny, Fleisch Manuel, Gutzmann Henning, Klassen Thomas, Bahnemann Detlef W
Institut für Technische Chemie, Leibniz Universität Hannover, Callinstrasse 5, D-30167 Hannover, Germany.
Institute of Materials Technology, Helmut Schmidt University, Holstenhofweg 85, D-22043 Hamburg, Germany.
Dalton Trans. 2017 Oct 3;46(38):12811-12823. doi: 10.1039/c7dt02063e.
Films prepared by cold spray have potential applications as photoanodes in electrochemical water splitting and waste water purification. In the present study cold sprayed photoelectrodes produced with WO (active under visible light illumination) and TiO (active under UV illumination) on titanium metal substrates were investigated as photoanodes for the oxidation of water and methanol, respectively. Methanol was chosen as organic model pollutant in acidic electrolytes. Main advantages of the cold sprayed photoelectrodes are the improved metal-semiconductor junctions and the superior mechanical stability. Additionally, the cold spray method can be utilized as a large-scale electrode fabrication technique for photoelectrochemical applications. Incident photon to current efficiencies reveal that cold sprayed TiO/WO photoanodes exhibit the best photoelectrochemical properties with regard to the water and methanol oxidation reactions in comparison with the benchmark photocatalyst Aeroxide TiO P25 due to more efficient harvesting of the total solar light irradiation related to their smaller band gap energies.
通过冷喷涂制备的薄膜在电化学水分解和废水净化中作为光阳极具有潜在应用。在本研究中，分别研究了在钛金属基底上用WO（在可见光照射下具有活性）和TiO（在紫外光照射下具有活性）制备的冷喷涂光电极作为水和甲醇氧化的光阳极。甲醇被选为酸性电解质中的有机模型污染物。冷喷涂光电极的主要优点是改善了金属-半导体结以及具有优异的机械稳定性。此外，冷喷涂方法可作为用于光电化学应用的大规模电极制造技术。入射光子到电流效率表明，与基准光催化剂Aeroxide TiO P25相比，冷喷涂的TiO/WO光阳极在水和甲醇氧化反应方面表现出最佳的光电化学性能，这是因为它们具有更小的带隙能量，能更有效地收集总的太阳光辐射。
