无金属石墨氮化碳光电阴极的制备与表征
Preparation and Characterization of Metal-free graphitic Carbon Nitride Film Photocathodes for Light-induced Hydrogen Evolution
摘要：
最近，已经表明，一种丰富的材料，聚合氮化碳，可以在可见光照射下在牺牲供体的存在下从水中产生氢[1]。我们将在这里提出的制备和表征的石墨氮化碳（g-C3 N4）的半导体衬底上的双氰胺前体在惰性气体条件下的热缩合膜。氮化碳薄膜的结构和表面形态的研究表明，g-C3 N4薄膜的高孔隙率的纳米微晶网络组成。光电化学研究表明，阴极极化光诱导析氢的质子浓度在很宽的范围内的水溶液电解质。此外，基于同步辐射的光电子能谱学已被应用于研究所使用的g-C3 N4薄膜光电阴极的表面/近表面的化学组成。首次表明g-C_3 N_4薄膜可以成功地用作光诱导析氢的光电化学材料。[1]X. Wang，K. Maeda，A. Thomas，K. Takanabe，G. Xin，J. M. Carlsson，K. Domen，M. Antonietti，Nature Mat. 2009，8，76-80.
英文摘要：
Very recently, it has been shown that an abundant material, polymeric carbon nitride, can produce hydrogen from water under visible-light irradiation in the presence of a sacrificial donor [1]. We will present here the preparation and characterization of graphitic carbon nitride (g-C3N4) films on semiconducting substrates by thermal condensation of dicyandiamide precursor under inert gas conditions. Structural and surface morphological studies of the carbon nitride films suggest a high porosity of g-C3N4 thin film consisting of a network of nanocrystallites. Photo-electrochemical investigations show upon cathodic polarization light-induced hydrogen evolution for a wide range of proton concentrations in the aqueous electrolyte. Additionally, Synchrotron radiation based photoelectron spectroscopy has been applied to study the surface/near-surface chemical composition of the utilized g-C3N4 film photocathodes. For the first time it is shown that g-C3N4 films can be successfully applied as photoelectrochemical material for light induced hydrogen evolution. [1]X. Wang, K. Maeda, A. Thomas, K. Takanabe, G. Xin, J. M. Carlsson, K. Domen, M. Antonietti, Nature Mat. 2009, 8, 76-80.
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