Nb2O5 的多光子行为及其与合成方法的相关性,Journal of Materials Science

当前位置： X-MOL 学术 › J. Mater. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Nb2O5 的多光子行为及其与合成方法的相关性
Journal of Materials Science ( IF 3.5 ) Pub Date : 2021-01-12 , DOI: 10.1007/s10853-021-05770-z
Cátia L. Ücker , Vitor Goetzke , Fábio C. Riemke , Marcelo L. Vitale , Lucas R.Q. de Andrade , Maicon D. Ücker , Eduardo C. Moreira , Mário L. Moreira , Cristiane W. Raubach , Sérgio S. Cava

研究了五氧化二铌 (Nb2O5) 作为染料敏化太阳能电池 (DSSC) 中的光阳极和罗丹明 B (RhB) 光催化降解催化剂的性能。四种 Nb2O5 样品（Nb2O5_SG、Nb2O5_CR、Nb2O5_PP 和 Nb2O5_MA）分别通过四种不同的方法合成，包括溶胶-凝胶、燃烧、聚合前体和微波辅助水热反应。在所有这些样品中，获得了 Nb2O5 的正交相，这导致了不同的形状和组装，这是非常相关的，因为纳米颗粒的表面积、形状和尺寸分布对光学过程有显着影响。所有样品的带隙保持恒定在 3.0 eV，即使是通过燃烧方法制备的样品。与局部失真相关的附加相位，在 688-260 cm-1 的振动范围内由拉曼光谱揭示。使用具有更小、更分散的 Nb2O5 颗粒的光阳极的 DSSC 显示出比不均匀的更好的结果。为了进行比较，DSSC 使用两种不同的对电极（铂和石墨）组装。含铂的 DSSC 显示出更好的光伏结果，主要是光电流从 Nb2O5_CR 的 1.17 mA.cm-2 到 Nb2O5_SG 的 1.64 mA.cm-2。对于 RhB 的光催化降解也观察到相同的趋势，其中较小且分散的 Nb2O5_CR 和 Nb2O5_SG 颗粒表现出最佳性能，并且在 180 分钟内分别降解了约 75% 和 61% 的 RhB 染料。因此，本研究的结果建立了合成方法与光子行为之间的相关性。

"点击查看英文标题和摘要"

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

The performance of niobium pentoxide (Nb2O5) as photoanodes in dye-sensitized solar cells (DSSCs) and as catalysts in the photocatalytic degradation of Rhodamine B (RhB) was investigated. Four samples of Nb2O5 (Nb2O5_SG, Nb2O5_CR, Nb2O5_PP, and Nb2O5_MA) were synthesized by four different methods, respectively, entailing the sol-gel, combustion, polymeric precursors, and a microwave-assisted hydrothermal reaction. In all these samples, the orthorhombic phase of Nb2O5 was obtained, which resulted in different shapes and assemblies, which is very relevant because the surface area, shape, and size distribution of the nanoparticles significantly contribute to the optical process. The bandgap remained constant at 3.0 eV for all the samples, even for the sample prepared by the combustion method. An additional phase, which is related to local distortions, was revealed by Raman spectroscopy within the vibration range of 688–260 cm−1. DSSCs using photoanodes with smaller and more dispersed Nb2O5 particles showed better results than those with inhomogeneities. For comparison, DSSCs were assembled using two different counter electrodes, platinum and graphite. The DSSC with platinum showed better photovoltaic results, mainly with photocurrents from 1.17 mA.cm−2 for Nb2O5_CR to 1.64 mA.cm−2 for Nb2O5_SG. The same trend was observed for the photocatalytic degradation of RhB, where the smaller and dispersed particles of Nb2O5_CR and Nb2O5_SG exhibited the best performance and, respectively, degraded approximately 75% and 61% of the RhB dye over 180 min. Therefore, the results of this study established a correlation between the synthesis methods and photonic behavior.

更新日期：2021-01-12

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南