Mai Lam Thuy Thi, Le Hai Viet, Nguyen Ngan Kim Thi, Pham Van La Tran, Nguyen Thu Anh Thi, Huynh Nguyen Thanh Le, Nguyen Hoang Thai
Tra Vinh University, 126 Nguyen Thien Thanh Street, Ward 5, Tra Vinh City 940000, Vietnam.
University of Science, VNU-HCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, 700000, Vietnam.
Beilstein J Nanotechnol. 2022 Jun 17;13:528-537. doi: 10.3762/bjnano.13.44. eCollection 2022.
Non-platinum electrodes for photoelectric devices are challenging and attractive to the scientific community. A thin film of molybdenum disulfide (MoS) was prepared on substrates coated with fluorine-doped tin oxide (FTO) to substitute the platinum counter electrode (CE) for dye-sensitized solar cells (DSSCs). Herein, we synthesized layered and honeycomb-like MoS thin films via the cyclic voltammetry (CV) route. Thickness and morphology of the MoS thin films were controlled via the concentration of precursor solution. The obtained results showed that MoS thin films formed at a low precursor concentration had a layered morphology while a honeycomb-like MoS thin film was formed at a high precursor concentration. Both types of MoS thin film were composed of 1T and 2H structures and exhibited excellent electrocatalytic activity for the I I redox couple. DSSCs assembled using these MoS CEs showed a maximal power conversion efficiency of 7.33%. The short-circuit value reached 16.3 mA·cm, which was higher than that of a conventional Pt/FTO CE (15.3 mA·cm). This work reports for the first time the possibility to obtain a honeycomb-like MoS thin film morphology by the CV method and investigates the effect of film structure on the electrocatalytic activity and photovoltaic performance of CEs for DSSC application.
用于光电器件的非铂电极对科学界来说既具有挑战性又颇具吸引力。在涂有氟掺杂氧化锡（FTO）的基底上制备了二硫化钼（MoS）薄膜，以替代染料敏化太阳能电池（DSSC）中的铂对电极（CE）。在此，我们通过循环伏安法（CV）合成了层状和蜂窝状的MoS薄膜。通过前驱体溶液的浓度来控制MoS薄膜的厚度和形貌。所得结果表明，在前驱体浓度较低时形成的MoS薄膜具有层状形貌，而在前驱体浓度较高时形成的是蜂窝状MoS薄膜。这两种类型的MoS薄膜均由1T和2H结构组成，并且对I / I氧化还原对表现出优异的电催化活性。使用这些MoS对电极组装的DSSC的最大功率转换效率达到7.33％。短路值达到16.3 mA·cm，高于传统的Pt/FTO对电极（15.3 mA·cm）。这项工作首次报道了通过CV方法获得蜂窝状MoS薄膜形貌的可能性，并研究了薄膜结构对用于DSSC的对电极的电催化活性和光伏性能的影响。
