Controllable Synthesis and Photocatalytic Properties of Hexagonal/Monoclinic WO3 Phase Junction

doi:10.3969/j.issn.1006-396X.2021.06.004

Abstract

Abstract:

The spherical hexagonal phase tungsten oxide (h?WO₃) was synthesized by precipitation method. Then a series of hexagonal/monoclinic WO₃(h/m?WO₃) phase junction photocatalysts were controllable fabricated by regulating the phase transition process from hexagonal to monoclinic phase. The crystal phase structure and phase composition, particle size and specific surface area of these WO₃ catalysts were characterized by X?ray diffraction (XRD), scanning electron microscopy (SEM) and specific surface area (BET). The experimental results of photocatalytic O₂ evolution show that compared with the pure hexagonal phase WO₃, the h/m?WO₃ with suitable crystal phase composition exhibits remarkable photocatalytic performance. Based on the band positions of hexagonal and monoclinic phases, the surface photovoltage (SPV) characterization results show that the formation of h/m?WO₃ phase junction significantly promotes the efficient separation of photogenerated electrons and holes on the surface of the catalyst, and then improves the photocatalytic activity of WO₃ catalyst.

Key words: Phase junction, WO₃, Photocatalysis, Photocatalytic O₂ evolution

摘要：

利用沉淀法合成了球形六方相氧化钨(h?WO₃)，通过调控六方相向单斜相的相变，可控制备了六方/单斜WO₃(h/m?WO₃)“异相结”催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)和比表面积(BET)等对WO₃催化剂的晶相结构及组成、粒子大小和比表面积进行了表征。光催化分解水产氧的实验结果表明，相较于纯六方相WO₃，具有合适晶相组成的h/m?WO₃展现了显著的光催化性能。结合六方相和单斜相的能带位置，表面光电压表征结果发现，h/m?WO₃“异相结”的形成显著促进了催化剂表面光生电子和空穴的高效分离，进而提高了催化剂的光催化活性。

关键词: 异相结, WO₃, 光催化, 光解水产氧

CLC Number:

O643.3

Jifa Liu, Xuebing Chen, Fangfang Wang, Jing Zhang, Changdong Chen. Controllable Synthesis and Photocatalytic Properties of Hexagonal/Monoclinic WO₃ Phase Junction[J]. Journal of Petrochemical Universities, 2021, 34(6): 22-26.

刘纪法, 陈雪冰, 王芳芳, 张静, 陈常东. 六方相/单斜相WO₃“异相结”的可控合成及光催化性能[J]. 石油化工高等学校学报, 2021, 34(6): 22-26.

Figures/Tables 7

Fig.1 XRD patterns of WO3?0 and WO3?t samples

Table 1 Different phase contents of WO3?0 and WO3?t samples

催化剂	w（h⁃WO₃）	w（m⁃WO₃）	w（Na₂W₄O₁₃）
WO₃⁃0	100.0	0	0
WO₃⁃380	69.5	30.5	0
WO₃⁃400	39.7	60.3	0
WO₃⁃470	0	78.0	22.0

Fig.2 SEM images of of WO3?0 and WO3?t samples

Fig.3 Photocatalytic O2 evolution performance on WO3?0 and WO3?t samples

Fig.4 Photocatalytic O2 evolution specific performance on WO3?0 and WO3?t samples

Fig.5 SPV curves of WO3?0 and WO3?t samples

Fig.6 Possible photocatalytic mechanism in h/m?WO3 phase junction structure

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Controllable Synthesis and Photocatalytic Properties of Hexagonal/Monoclinic WO₃ Phase Junction

六方相/单斜相WO₃“异相结”的可控合成及光催化性能

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