一步合成TiO2/FeO(OH)纳米异质结构作为析氧反应电催化剂

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hailin Liu, Andong Wang, Mengmeng Wang, Zihao Li, Quanmin Dai*, Shuo Sun, Xuyang Wang, Kaixin Zhang and Lai Wei, 
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引用次数: 0

摘要

过渡金属化合物在地球上储量丰富,是一种经济有效的材料。然而,其固有的低导电性和低电催化活性的特性极大地限制了其作为电催化剂的应用。本研究采用一步水热法成功合成了富含非均相结构的TiO2/FeO(OH)纳米复合材料,并通过调整Ti元素的比例获得了具有优异电催化析氧反应(OER)性能的纳米TiO2/FeO(OH)-2。异质结界面的相反电荷区导致了内建电场的重建,加速了电子转移,优化了催化反应过程中的电子结构,保证了异质结表面带电活性中心位的稳定性。此外,原位拉曼测量证实了内置电场在TiO2/FeO(OH)-2纳米异质结构电催化OER过程中的关键作用。密度泛函理论计算进一步证实了在TiO2/FeO(OH)-2中构建的非均相界面对OER活性的促进作用,并揭示了中间*OOH是OER反应的速率决定步骤。优化后的具有纳米棒和纳米球结构的p-n异质结的TiO2/FeO(OH)-2复合材料在10 mA cm-2下的过电位为262 mV,在300 mV过电位下持续有效100 h。本研究不仅为构建p-n型异质结构材料提供了一种简单的方法,而且还原位表征了异质结界面在电催化OER机理中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

One-Step Synthesis of TiO2/FeO(OH) Nano-Heterostructures as Electrocatalysts for the Oxygen Evolution Reaction

One-Step Synthesis of TiO2/FeO(OH) Nano-Heterostructures as Electrocatalysts for the Oxygen Evolution Reaction

Transition metal compounds are abundant on Earth and are cost-effective materials. However, their inherent characteristics of low electrical conductivity and low electrocatalytic activity greatly limit their applications as electrocatalysts. In this study, we successfully synthesized TiO2/FeO(OH) nanocomposite materials rich in heterogeneous structures using a one-step hydrothermal method and obtained nanostructured TiO2/FeO(OH)-2 with excellent electrocatalytic oxygen evolution reaction (OER) performance by adjusting the ratio of Ti elements. The opposite charge regions at the heterojunction interface led to the reconstruction of the built-in electric field, accelerating electron transfer, optimizing the electronic structure during the catalytic reaction process, and ensuring the stability of surface charged active center sites in the heterojunction. Furthermore, in situ Raman measurements confirmed the crucial role of the built-in electric field in the electrocatalytic OER process of the TiO2/FeO(OH)-2 nano-heterostructure. The density functional theory calculations further confirmed the promotional effect of the heterogeneous interfaces constructed in TiO2/FeO(OH)-2 on the OER activity and also revealed that the intermediate *OOH is the rate-determining step of the OER reaction. The optimized TiO2/FeO(OH)-2 composites with p–n heterojunctions featuring nanorod and nanosphere structures recorded an overpotential of 262 mV at 10 mA cm–2 and exhibited sustained effectiveness over a 100 h period at an overpotential of 300 mV. This study not only provides a simple method for constructing p–n type heterogeneous structure materials but also in situ characterizes the role of heterojunction interfaces in the mechanism of electrocatalytic OER.

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来源期刊
CiteScore
8.30
自引率
3.40%
发文量
1601
期刊介绍: ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.
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