Small Organic Molecule Based Photoelectrodes for Efficient Photoelectrochemical Cathodic Protection,ACS Applied Electronic Materials

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Small Organic Molecule Based Photoelectrodes for Efficient Photoelectrochemical Cathodic Protection
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-11-17 , DOI: 10.1021/acsaelm.0c00829
Xiaojie Liu ₁ , Xin Jing ₁ , Yong Zhao ₁ , Wei Wang ₁ , Liangmin Yu ₂ , Mingliang Sun _{1,

3}

Affiliation

Photoelectrochemical cathodic protection (PECCP) as a branch of photocatalysis and photoelectrochemistry holds great promise for efficient anticorrosion. Organic semiconductors with tunable bandgaps and favorable optoelectronic properties have been attracting more attention in the photoelectrochemical (PEC) field. However, its application for PECCP has been marginally explored. Herein, we successfully fabricated a small organic molecule (ITIC: 3,9-bis(2-methylene-(3-(1,1- dicyanomethylene)-indanone))-5,5,11,11tetrakis(4hexylphenyl)-dithieno[2,3-d:2,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene) based photoelectrode for PECCP of 304 stainless steel (304SS). The PEC research proved that it could provide PECCP for 304SS with a photoinduced potential drop of 100 mV. A molecular structure design strategy was also adopted to broaden the light absorption spectrum of ITIC by halogenating the terminal group with the Cl atom. The obtained ITIC derivate (IT-2Cl)-based photoelectrode provided a higher photoinduced potential drop of 150 mV for PECCP of 304SS. More impressively, the separation of photoinduced electron–hole pairs was promoted and the electron transportation was accelerated, when introducing TiO_x thin film as the electron acceptor and electron transportation channel in the photoelectrode. Consequently, the PECCP for 304SS was dramatically enhanced, with the potential drop increasing to 290 mV. The flexible molecular design strategy and improved PECCP performance proposed a guideline for the potential applications of organic semiconductor-based photoelectrodes in the PECCP field.

中文翻译：

小型有机分子基光电电极，可实现高效的光电化学阴极保护

光电化学阴极保护（PECCP）作为光催化和光电化学的一个分支，对有效的防腐具有广阔的前景。具有可调节的带隙和良好的光电性能的有机半导体已经在光电化学（PEC）领域引起了越来越多的关注。然而，已经很少地探索其在PECCP中的应用。在这里，我们成功地制备了一个小的有机分子（ITIC：3,9-双（2-亚甲基-（3-（1,1-二氰基亚甲基）-茚满酮））-5,5,11,11四（4-己基苯基）-二硫代[ 2,3- d：2,3'- d '] -s-indaceno [1,2- b：5,6- b′]二噻吩基）用于304不锈钢（304SS）的PECCP的光电极。PEC研究证明，它可以为304SS提供PECCP，且光致电势下降100 mV。还采用了分子结构设计策略，通过用Cl原子卤化端基来拓宽ITIC的光吸收谱。对于304SS的PECCP，获得的基于ITIC衍生物（IT-2Cl）的光电极提供了更高的150 mV的光致电势降。更令人印象深刻的是，引入TiO _x时，促进了光致电子-空穴对的分离，并加速了电子传输。薄膜作为光电极中的电子受体和电子传输通道。因此，304SS的PECCP得到了显着增强，电位降增加到290 mV。灵活的分子设计策略和改进的PECCP性能为在PECCP领域中基于有机半导体的光电极的潜在应用提出了指南。

更新日期：2020-12-22

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