氧化钨纳米线的相变光学、光催化和电容特性

IF 3.3 3区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR
Zeynep Kahraman, Ahmet Güngör, Merve Buldu-Aktürk, Metin Tan, Emre Alp, Emre Erdem and Aziz Genç
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引用次数: 0

摘要

过渡金属氧化物具有丰度高、毒性低、稳定性好等优点,具有广泛的应用前景。纳米工程方法对于控制这些材料的结构、光学和电子特性至关重要,能够以经济有效和环保的方式实现所需的特性。在本研究中,我们通过水热法制备了化学计量(WO3)和亚化学计量(WO3-x)氧化钨纳米线。这种方法使我们能够系统地研究不同相和氧空位对光学性质以及光催化和超级电容应用的影响。我们将RhB的光降解作为各种实验条件下光催化活性的基准,发现氧空位显著影响光催化行为。例如,在环境条件下,WO3-x纳米线在短时间内吸附/降解了大量的RhB,而在环境条件下,WO3纳米线大多是不活跃的。H2O2的加入提高了WO3纳米线在30分钟内的光催化性能,在低pH条件下,H2O2的加入效果更好。本研究还探讨了WO3和WO3-x纳米线的相依赖电化学特性,通过利用它们在对称和不对称配置中的互补特性,深入了解了它们改善超级电容器性能的潜力。WO3-x具有更高的氧空位密度和更薄的结构,具有更强的电导率和更多的电荷存储活性位点,从而具有优越的比电容和电荷保留率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Phase-dependent optical, photocatalytic and capacitive properties of tungsten oxide nanowires

Phase-dependent optical, photocatalytic and capacitive properties of tungsten oxide nanowires

Transition metal oxides hold great promise across a wide range of applications due to favorable properties such as high abundance, low toxicity, and excellent stability. Nanoengineering approaches are essential for controlling the structural, optical, and electronic properties of these materials, enabling the achievement of desired characteristics in a cost-effective and environmentally friendly manner. In this study, we synthesize stoichiometric (WO3) and sub-stoichiometric (WO3−x) tungsten oxide nanowires by controlling their phases and morphologies through the hydrothermal method. This approach allows us to systematically investigate the effects of different phases and oxygen vacancies on the optical properties, as well as on photocatalytic and supercapacitance applications. We use the photodegradation of RhB as a benchmark for photocatalytic activity under various experimental conditions, revealing that oxygen vacancies significantly influence photocatalytic behavior. For example, WO3−x nanowires adsorb/degrade a substantial amount of RhB within short durations under ambient conditions, where WO3 nanowires are mostly inactive. The addition of H2O2 enhances the photocatalytic performance of WO3 nanowires over 30 minutes, with even better results under low pH conditions with H2O2. This study also explores the phase-dependent electrochemical properties of WO3 and WO3−x nanowires, providing insights into their potential for improved supercapacitor performance by leveraging their complementary properties in symmetric and asymmetric configurations. WO3−x, with a higher density of oxygen vacancies and thinner structure, offers enhanced conductivity and increased active sites for charge storage, resulting in superior specific capacitance and charge retention.

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来源期刊
Dalton Transactions
Dalton Transactions 化学-无机化学与核化学
CiteScore
6.60
自引率
7.50%
发文量
1832
审稿时长
1.5 months
期刊介绍: Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.
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