Single-Step Hydrothermal Synthesis of HNO3 Exfoliated Graphite/Fe2O3 Composite for Methanol Oxidation in Acidic Media

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-11-26 DOI:10.1007/s12678-024-00917-3

Shan Ahmed Khan, Aqsa Batool, Muhammad Salman

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Abstract

Methanol has potential to replace conventional fuels. But its popularity is hindered by lower kinetics of electrode reactions, lower surface area, CO poisoning of catalysts, and higher cost of platinum-based catalysts. It is rare to find electrocatalysts for methanol oxidation in acidic media because its mechanism is not fully understood yet. In this research, HNO₃ exfoliated graphite powder and iron oxide composites have been synthesized by facile, single-step hydrothermal method. This procedure replaces the long and hazardous route of synthesizing graphene oxide. These composites not only provide large surface area for electrode reactions but also utilize catalytic and electrical capabilities of graphene and iron synergistically. Samples were characterized with FTIR, XRD, and SEM analyses while electrocatalytic efficiencies were studied with cyclic voltammetry and electrochemical impedance spectroscopy. Composites have shown remarkable efficiencies for oxidation of methanol in acidic media.

Graphical Abstract

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单步水热合成HNO3剥离石墨/Fe2O3复合材料用于酸性介质中甲醇氧化

甲醇有取代传统燃料的潜力。但由于电极反应动力学低、比表面积小、催化剂CO中毒以及铂基催化剂成本高，阻碍了铂基催化剂的普及。酸性介质中甲醇氧化的电催化剂很少发现，因为其机理尚未完全了解。本研究采用简单的单步水热法制备了HNO3剥离石墨粉和氧化铁复合材料。这一过程取代了合成氧化石墨烯的漫长而危险的路线。这些复合材料不仅为电极反应提供了大的表面积，而且还协同利用了石墨烯和铁的催化和电学能力。采用FTIR、XRD和SEM对样品进行了表征，并用循环伏安法和电化学阻抗谱对样品的电催化效率进行了研究。复合材料在酸性介质中表现出显著的甲醇氧化效率。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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