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Evaluation of dual layered photoanode for enhancement of visible-light-driven applications

机译：用于增强可见光驱动应用的双层光电极的评估

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Ternary structures consisting of hollow g-C _(3) N _(4) nanofibers/MoS _(2) /sulfur, nitrogen-doped graphene and bulk g-C _(3) N _(4) (TCN) were designed as a dual layered film and fabricated using a spin-coating method. The first ternary structures were spin-coated on fluorine-doped tin oxide (FTO) glass, followed by spin-coating of g-C _(3) N _(4) film to form dual layers. We characterized the microstructural morphologies, chemical composition/bonding and optical properties of the dual layered film and observed significantly reduced recombination rates of photo-induced electron–hole pairs due to effective separation of the charge carriers. We tested methylene blue (MB) photodegradation and observed remarkable MB degradation by the dual layered film over 5 hours, with a kinetic rate constant of 1.24 × 10 ~(?3) min ~(?1) , which is about four times faster than that of bare TCN film. Furthermore, we estimated the H _(2) evolution of the dual layered film to be 44.9 μmol over 5 hours, and carried out stable recycling over 45 hours under visible irradiation. Due to the lower electrochemical impedance spectroscopy (EIS) resistance value of the dual layered film (～50 ohm cm ~(2) ) compared to the TCN film, the ternary structures and bulk g-C _(3) N _(4) film were well-connected as a heterojunction, reducing the resistance at the interface between the film and the electrolyte. These results indicate that the effective separation of the photo-induced electron–hole pairs using the dual layered film dramatically improved its photo-response ability under visible light irradiation.
机译：由中空GC _（3）N _（4）纳米纤维/ MOS _（2）/硫，氮掺杂石墨烯和大块GC _（3）N _（4）（TCN）组成的三元结构被设计为双层薄膜和使用旋涂法制造。将第一三元结构旋涂在氟掺杂的氧化锡（FTO）玻璃上，然后旋涂G-C _（3）N _（4）膜以形成双层。我们表征了双层膜的微观结构形貌，化学成分/粘合和光学性质，并且由于电荷载体的有效分离而观察到光诱导的电子 - 孔对的重组率显着降低。我们测试了亚甲基蓝（MB）光降解，并观察到5小时内的双层膜的显着MB降解，动力速率常数为1.24×10〜（？3）分钟〜（？1），这比速度快四倍裸露的TCN电影。此外，我们估计了双层膜的H _（2）进化在5小时内为44.9μmol，在可见辐照下在45小时内进行稳定的再循环。由于与TCN膜相比，双层膜的电化学阻抗光谱（EIS）电阻值（〜50欧姆〜（2）），三元结构和散装GC _（3）N _（4）膜是作为异质结合，降低膜与电解质之间的界面处的电阻。这些结果表明，使用双层膜的光诱导的电子 - 空穴对的有效分离在可见光照射下显着改善了其光响应能力。

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