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首页> 外文期刊>Applied Surface Science >Photosensitization of CdS by acid red-94 modified alginate: Dual ameliorative effect upon photocatalytic hydrogen evolution
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Photosensitization of CdS by acid red-94 modified alginate: Dual ameliorative effect upon photocatalytic hydrogen evolution

机译：酸性红94修饰藻酸盐对CdS的光敏作用：对光催化制氢的双重改善作用

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Photosensitization is a potential candidate for improving photocatalytic performance of inorganic semiconductors in water splitting. Given many photosensitizers are organic dyes bearing strong hydrophobicity, simple combination of dye and inorganic material, however, still suffers limited access of the photocatalyst to water and consequently presents compromised activity. Herein, we exploited aminated acid red-94 (RB-NH2) to prepare dye chemically modified alginate (RB-NH-HA) via dialysis method, which was further employed to incorporate with CdS (RB-NH-HA@CdS). According to the water contact angles (CA(water)) and photoelectrochemical detection, though simply integrated CdS with RB-NH2 (RB-NH2@CdS) expectantly enhanced the transient photocurrent over CdS, yet the CA(water) was apparently emaciated from 53.56 degrees to 86.12 degrees, even leading to a slightly attenuated photocatalytic performance in hydrogen evolution under visible light. In contrast, introducing hydrophilic HA into RB-NH-HA@CdS is able to reclaim the CA(water) to 50.22 degrees. Moreover, owning to the cooperative effects proffered by the significantly increased contacts between the reactant (H2O) and the composite, as well as the fluorescent feature that improves the photocatalysts visible-light absorption and simultaneously suppresses the recombination of photo-induced carriers, the hydrogen production rate was advanced to 475 mu mol.h(-1) H-2, about 4.5 and 5.7 times that of CdS and RB-NH2@CdS, respectively. Our work provides an efficient method to ameliorate the sensitization technique aiming to improve the photocatalytic performance of inorganic semiconductors.
机译：光敏化是改善无机半导体在水分解中的光催化性能的潜在候选者。由于许多光敏剂是具有强疏水性的有机染料，因此染料和无机材料的简单组合仍然使光催化剂接触水的能力受到限制，因此其活性受到损害。在这里，我们利用胺化酸性红94（RB-NH2）通过渗析法制备了染料化学修饰的藻酸盐（RB-NH-HA），并进一步与CdS（RB-NH-HA @ CdS）结合使用。根据水接触角（CA（水））和光电化学检测，尽管将CdS与RB-NH2简单地集成（RB-NH2 @ CdS）有望增强CdS上的瞬态光电流，但CA（水）显然从53.56消散。到86.12度，甚至导致可见光下氢气释放中的光催化性能略微减弱。相反，将亲水性HA引入RB-NH-HA @ CdS可以将CA（水）回收至50.22度。此外，由于反应物（H2O）与复合物之间的接触显着增加，并具有荧光作用，可改善光催化剂的可见光吸收并同时抑制光致载流子，氢的重组，从而具有协同作用。生产率提高到475μmol.h（-1）H-2，分别约为CdS和RB-NH2 @ CdS的4.5和5.7倍。我们的工作提供了一种有效的方法来改善敏化技术，旨在提高无机半导体的光催化性能。

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