Cold Gas Sprayed TiO2-Based Electrodes for the Photo-Induced Water Oxidation
Cold Gas Sprayed TiO2-Based Electrodes for the Photo-Induced Water Oxidation
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用于光诱导水氧化的冷气体喷涂二氧化钛基电极
DOI：
10.1149/05830.0021ecst
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T. Klassen
中科院分区：
文献类型：
--
作者：
I. Herrmann-Geppert;P. Bogdanoff;H. Gutzmann;T. Dittrich;T. Emmler;R. Just;M. Schieda;F. Gärtner;T. Klassen
冷气体喷涂(CGS)是一种将半导体粒子沉积到衬底上以形成电化学应用的光电极的创新方法。在CGS工艺中，在气体载体的不同温度下(300-1000℃)，在钛衬底(TiO2CGS膜)上沉积TiO2层(由Evonik Industries生产的P25-20)。结构表征表明，二氧化钛纳米颗粒的块体性质没有变化。显然，CGS过程持续时间较短，阻碍了热气流中二氧化钛颗粒的结晶体变。然而，表面光伏测量表明，当暴露在不同的气体温度下时，CGS工艺改变了表面的缺陷状态。在光电化学测量中，TiO2CGS薄膜产生的光电流和IPCE值是由成熟的Doctor Blade技术制备的可比薄膜的七倍。效率的提高可能是由于在冷气喷涂过程中颗粒焊接到金属基材上而增强了颗粒与基材的结合。
Cold gas spraying (CGS) is presented as an innovative approach to deposit semiconductor particles onto substrates in order to form photoelectrodes for electrochemical applications. Thin layers of TiO2 (P25-20 by Evonik Industries) are deposited onto titanium substrates (TiO2-CGS films) at different temperatures of the gas carrier within the CGS process (300-1000 C). Structural characterization reveals unchanged bulk properties of the TiO2 nanoparticles. Clearly, the short duration time of the CGS process hinders crystalline bulk changes of the TiO2 particles in the hot gas stream. However, surface photovoltage measurements indicate that the CGS process modified defect states at the surface when exposed to different gas temperature. In photoelectrochemical measurements TiO2-CGS films yield seven times higher photocurrents and IPCE values than comparable films prepared by the well-established doctor blade technique. The increased efficiency might be due to an enhanced particle to substrate bonding caused by particles welding to the metallic substrate during the cold gas spray process.