Investigating the properties of perovskite oxide based electrocatalysts for oxygen evolution reaction (OER)

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-11-24 DOI:10.1007/s10971-024-06616-1

Areej S. Alqarni, Arooj Fatima, Abhinav Kumar, A. Dahshan

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Abstract

Developing an efficient electrocatalyst for water splitting is imperative to improve the slow OER and store electrical energy as H₂ fuel. Creating an inexpensive development process for an effective OER electrocatalyst with features like a lot of active sites, a huge surface area (SA) and remarkable stability is vital for producing more H₂ and making it more widely available. We created the CoTiO₃/rGO nanocomposite using hydrothermal method in basic solution to improve OER kinetics. The morphological structure of the CoTiO₃/rGO was varied, showing CoTiO₃ nanoparticles anchored on rGO nanosheets to increase the electrolyte ions’ SA for adsorption. The CoTiO₃/rGO electrocatalyst performs better than CoTiO₃, as shown by its remarkable 38 h durability and overpotential (185 mV) at 10 mA/cm². Additionally, compared to CoTiO₃ (56 mV/dec), the CoTiO₃/rGO nanocomposite has a decreased Tafel slope (35 mV/dec). The larger SA and active site of the nanocomposite enhaned electrochemical characteristics of CoTiO₃/rGO nanocomposite. The combination of a metal oxide with material produced from carbon offers a promising first step toward making an exceptional electrocatalyst for use in water electrochemistry.

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钙钛矿氧化物基析氧反应电催化剂的性能研究

开发一种高效的水分解电催化剂是改善慢OER和储存电能作为氢气燃料的必要条件。为高效的OER电催化剂创造一种廉价的开发过程，这种催化剂具有许多活性位点、巨大的表面积（SA）和卓越的稳定性等特点，对于生产更多的H2并使其更广泛地使用至关重要。为了改善OER动力学，我们在碱性溶液中采用水热法制备了CoTiO3/rGO纳米复合材料。CoTiO3/rGO的形态结构是不同的，表明CoTiO3纳米颗粒锚定在rGO纳米片上，增加了电解质离子的SA吸附。CoTiO3/rGO电催化剂性能优于CoTiO3，表现为其优异的38 h耐久性和10 mA/cm2下的过电位（185 mV）。此外，与CoTiO3 （56 mV/dec）相比，CoTiO3/rGO纳米复合材料的Tafel斜率（35 mV/dec）降低。较大的SA和活性位点增强了CoTiO3/rGO纳米复合材料的电化学特性。金属氧化物与碳材料的结合为制造用于水电化学的特殊电催化剂提供了有希望的第一步。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.