Convenient synthesis of hollow tubular In2O3/PDA S-scheme inorganic/organic heterojunction photocatalyst for H2O2 production and its mechanism

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics Pub Date : 2024-11-22 DOI:10.1016/j.jmat.2024.100978

Yunhao Ma, Shan Wang, Yingjie Zhang, Bei Cheng, Liuyang Zhang

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Abstract

The development of heterojunction photocatalysts for hydrogen peroxide (H₂O₂) generation is both environmentally sustainable and cost-effective but presents considerable challenges. In this study, we synthesized hollow tubular indium oxide (In₂O₃) by calcining In-MIL-68 and subsequently composited it with polydopamine (PDA) via in-situ self-polymerization. This process resulted in the formation of an In₂O₃/PDA step-scheme (S-scheme) heterojunction. The optimized sample demonstrated H₂O₂ production rates approximately 2.1 and 4.5 times higher than the pure In₂O₃ and PDA, respectively. The enhanced photocatalytic performance of the In₂O₃/PDA composite is the result of several synergistic factors: increased light absorption due to the hollow structure, a larger specific surface area, and high separation efficiency of photo-generated electron-hole pairs facilitated by the S-scheme heterojunction. In-situ irradiated X-ray photoelectron spectroscopy (ISI-XPS) confirmed the charge transfer pathway follows the S-scheme mechanism. This work not only highlights a practical method for constructing inorganic/organic S-scheme heterojunction photocatalysts but also provides a detailed analysis of their underlying mechanisms, paving the way for more efficient and sustainable photocatalytic systems.

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方便合成用于产生 H2O2 的中空管状 In2O3/PDA S 型无机/有机异质结光催化剂及其机理

开发用于生成过氧化氢（H2O2）的异质结光催化剂既具有环境可持续性，又具有成本效益，但同时也面临着相当大的挑战。在本研究中，我们通过煅烧 In-MIL-68 合成了空心管状氧化铟（In2O3），随后通过原位自聚合将其与多巴胺（PDA）复合。这一过程形成了 In2O3/PDA 阶梯式（S-scheme）异质结。优化样品的 H2O2 生成率分别是纯 In2O3 和 PDA 的约 2.1 倍和 4.5 倍。In2O3/PDA 复合材料光催化性能的增强是几个协同因素共同作用的结果：中空结构增加了光吸收，比表面积增大，S-scheme 异质结促进了光生电子-空穴对的高分离效率。原位辐照 X 射线光电子能谱（ISI-XPS）证实电荷转移途径遵循 S 型机制。这项工作不仅强调了构建无机/有机 S 型异质结光催化剂的实用方法，还详细分析了其基本机制，为建立更高效、更可持续的光催化系统铺平了道路。

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来源期刊

Journal of Materiomics Materials Science-Metals and Alloys

CiteScore

14.30

自引率

6.40%

发文量

331

审稿时长

37 days

期刊介绍： The Journal of Materiomics is a peer-reviewed open-access journal that aims to serve as a forum for the continuous dissemination of research within the field of materials science. It particularly emphasizes systematic studies on the relationships between composition, processing, structure, property, and performance of advanced materials. The journal is supported by the Chinese Ceramic Society and is indexed in SCIE and Scopus. It is commonly referred to as J Materiomics.