通过 NaH2PO2 处理将氧空位引入 WO3 光阳极以实现高效水分离。

IF 3.7 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Qiuyang Huang, Yicheng Zhao, Yongdan Li
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引用次数: 0

摘要

WO3 具有很高的光吸收能力和合适的能带结构,被认为是一种很有前途的光电化学水分离光阳极材料。然而,光诱导电子-空穴分离效率较低限制了它的应用。在此,我们报告了一种通过 NaH2PO2 处理在 WO3 光阳极表面引入氧空位(OV)来抑制电子-空穴重组的有效策略。经过 NaH2PO2 处理后,形成了厚度为 4 nm 的富氧空位无定形表面层,从而提高了电荷载流子密度,扩大了光阳极的电化学表面积。经过 NaH2PO2 处理后,电荷分离效率和表面注入效率都得到了提高,光阳极的电荷转移过程也随之加快。在 1.23 V 的电压下,改性 WO3 光阳极的电流密度达到 0.96 mA cm-2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Introducing Oxygen Vacancies into a WO<sub>3</sub> Photoanode through NaH<sub>2</sub>PO<sub>2</sub> Treatment for Efficient Water Splitting.

Introducing Oxygen Vacancies into a WO3 Photoanode through NaH2PO2 Treatment for Efficient Water Splitting.

WO3, with a high light absorption capacity and a suitable band structure, is considered a promising photoanode material for photoelectrochemical water splitting. However, the poor photoinduced electron-hole separation efficiency limits its application. Herein, we report an effective strategy to suppress electron-hole recombination by introducing oxygen vacancies (OV) on the surface of a WO3 photoanode through NaH2PO2 treatment. An OV-enriched amorphous surface layer with a thickness of 4 nm is formed after NaH2PO2 treatment, which increases the charge carrier density and enlarges the electrochemical surface area of the photoanode. The charge separation and surface injection efficiencies are both improved after NaH2PO2 treatment, and the charge transfer process of the photoanode is accelerated consequently. The current density of the modified WO3 photoanode reaches 0.96 mA cm-2 at 1.23 V.

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来源期刊
Langmuir
Langmuir 化学-材料科学:综合
CiteScore
6.50
自引率
10.30%
发文量
1464
审稿时长
2.1 months
期刊介绍: Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).
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