Fabrication of high performance SnFe2O4@PANI electrocatalyst for Oxygen Evaluation Reaction (OER) by hydrothermal method

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-09-02 DOI:10.1007/s10971-024-06495-6

Mukhtiar Hussain, Abdelaziz Gassoumi, Ilya A. Weinstein, A. Kahshan, Khursheed Ahmad, A. M. A. Henaish

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Abstract

Developing cutting-edge catalysts for oxygen evolution reaction (OER) is crucial for enhancing the efficiency of water splitting. Spinel-type materials have gained recognition for their exceptional catalytic performance in OER activity. The excessive OER overpotential is the significant obstacle that hinders the use of spinel-type materials. In this work, polyaniline (PANI) was incorporated to significantly enhance the performance of spinel SnFe₂O₄ material by straightforward hydrothermal method. SnFe₂O₄@PANI catalyst demonstrated an impressive overpotential of 198 mV at 10 mA cm^–2 and a 33 mV dec^–1 Tafel slope with higher OER activity. The electrochemical surface area (ECSA) of SnFe₂O₄@PANI catalyst was determined to be 2348.53 cm², with higher cyclic stability of 25 h after 5000th cycles with minimal impedance characteristics (R_ct = 0.18 Ω). In addition, the findings showed that the inclusion of PANI led to expansion of the surface area to improve the conductivity, resulting in notable enhancement of the catalysts’ OER activity. This modification has resulted in an improved OER catalyst, making it highly sought after for various applications in the water-splitting field.

Graphical Abstract

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水热法制备用于氧评价反应 (OER) 的高性能 SnFe2O4@PANI 电催化剂

开发用于氧进化反应（OER）的尖端催化剂对于提高水分离效率至关重要。尖晶石型材料因其在氧进化反应活性方面的优异催化性能而获得认可。过高的 OER 过电位是阻碍尖晶石型材料应用的主要障碍。在这项工作中，通过直接水热法加入聚苯胺（PANI），显著提高了尖晶石 SnFe2O4 材料的性能。SnFe2O4@PANI 催化剂在 10 mA cm-2 时的过电位为 198 mV，Tafel 斜率为 33 mV dec-1，具有更高的 OER 活性。经测定，SnFe2O4@PANI 催化剂的电化学表面积（ECSA）为 2348.53 平方厘米，具有更高的循环稳定性，在循环 5000 次后仍能保持 25 小时，阻抗特性极小（Rct = 0.18 Ω）。此外，研究结果表明，PANI 的加入扩大了表面积，从而提高了导电性，显著增强了催化剂的 OER 活性。这种改性催化剂改善了 OER 的性能，使其在水分离领域的各种应用中备受青睐。

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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.