Design of Hierarchical Structured Catalysts: SnO2-Modified TiO2 Nanotube Arrays Enabling Ultra-Low Overpotential Acidic Oxygen Evolution Reaction

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-05-08 DOI:10.1007/s10562-025-05037-1

Qingchen Lu, Xiaoyu Huang, Yaowen Zhang, Dayong Fan, Faming Han, Chandrasekaran Sundaram, Huidan Lu, Yongping Liu

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引用次数: 0

Abstract

The construction of the strong oxid-support interaction (SOSI) between the support and the active component is crucial for regulating the atomic configuration and electronic structure of the catalyst. In this study, the electrocatalytic oxygen evolution reaction (OER) performance of IrO_x in acidic electrolytes was significantly enhanced by constructing a double intermediate layer of titanium dioxide nanotube array (TNT) and SnO₂. The overpotential of TNT/SnO₂/IrO_x at a current density of 10 mA cm^− 2 was 220 mV, which is 69 mV and 93 mV lower than that of directly loaded TNT/IrO_x (289 mV) and TNT/IrO₂ (313 mV), respectively. Additionally, the introduction of SnO₂ significantly improved the stability of the catalyst. After a 100 h static chronopotentiometry (CP) test at a current density of 10 mA cm^− 2, the potential change was only 18 mV, much lower than that of TNT/IrO₂ (175 mV) and TNT/IrO_x (50 mV). Through in-depth surface morphology and structure analysis, it was found that IrO_x is anchored on the SnO₂ mesolayer and uniformly dispersed. Furthermore, the TNT array has exhibits a strong interaction with IrOₓ, and the addition of the intermediate layer SnO₂ effectively stabilizes Ir, preventing its reduction. The results demonstrated that the synergistic effect of SnO₂ and TNT significantly enhanced the catalytic activity of IrO_x. In summary, this study successfully developed an efficient and stable acidic OER catalyst through multistage interface engineering design, providing a new solution for the industrial application of low-iridium supported catalysts.

Graphical Abstract

The SEM Diagram Shows the Actual Appearance cross-section of the Catalyst, that Is, the SnO₂/IrO_x Catalyst Is Directly Loaded on TNT

查看原文本刊更多论文

分层结构催化剂的设计：sno2修饰TiO2纳米管阵列实现超低过电位酸性析氧反应

载体与活性组分之间的强氧化-负载相互作用（SOSI）的构建对于调节催化剂的原子构型和电子结构至关重要。在本研究中，通过构建二氧化钛纳米管阵列（TNT）和SnO2的双中间层，IrOx在酸性电解质中的电催化析氧反应（OER）性能显著增强。在10 mA cm−2电流密度下，TNT/SnO2/IrOx的过电位为220 mV，比直接负载TNT/IrOx的过电位（289 mV）和TNT/IrO2的过电位（313 mV）分别低69 mV和93 mV。此外，SnO2的引入显著提高了催化剂的稳定性。在10 mA cm−2的电流密度下进行100 h静态时电位测定（CP）测试后，电位变化仅为18 mV，远低于TNT/IrO2 （175 mV）和TNT/IrOx （50 mV）。通过深入的表面形貌和结构分析，发现IrOx锚定在SnO2介层上，并均匀分散。此外，TNT阵列与IrOₓ表现出强烈的相互作用，中间层SnO₂的加入有效地稳定了Ir，阻止了其还原。结果表明，SnO2和TNT的协同作用显著提高了IrOx的催化活性。综上所述，本研究通过多级界面工程设计成功开发出高效稳定的酸性OER催化剂，为低铱负载型催化剂的工业应用提供了新的解决方案。SEM图显示了催化剂的实际外观截面，即SnO2/IrOx催化剂直接装载在TNT上

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.