Microwave-Assisted synthesis of CuxFe100-x/Carbon aerogel (x = 0, 30, 50, 70) with enhanced Electrocatalytic activity towards oxygen evolution reaction

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-11-16 DOI:10.1016/j.jelechem.2024.118811

Meryem Samancı , Muhammad Asim , Akbar Hussain , Naveed Kausar Janjua , Ayşe Bayrakçeken

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Abstract

A simple and efficient microwave-assisted synthesis route was adopted for carbon aerogel (CA)-supported Cu and Fe catalysts for OER in alkaline media. Catalysts were characterized physically by ICP-MS, XRD, TEM, XPS, SEM, and EDX and electrochemically by CV, chronoamperometry, and EIS. The catalyst having the composition of Cu₃₀Fe₇₀/CA showed excellent activity towards OER with low overpotential (345 mV) and Tafel slope (92.5 mV dec⁻¹). Diffusion coefficient (D° = 2.1 × 10⁻⁸ cm² s⁻¹), mass transport coefficient (m_T = 2.8 × 10⁻⁴ cm s⁻¹), heterogeneous rate constant (k° = 5.7 × 10⁻⁴ cm s⁻¹), and electrochemically active surface area (0.0167 cm²) were obtained for Cu₃₀Fe₇₀/CA modified glassy carbon electrode. CV response in the non-faradic region showed that C_dl and electrochemical surface area (ECSA) of Cu₃₀Fe₇₀/CA increased ∼ 34 times compared to Fe/CA. This work suggests that adding up an optimum amount of Cu to the Fe/CA nanocomposite offers a cost-effective and efficient electrocatalyst for OER.

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微波辅助合成 CuxFe100-x/Carbon 气凝胶（x = 0、30、50、70），增强其对氧进化反应的电催化活性

采用简单高效的微波辅助合成路线，制备出了在碱性介质中用于 OER 的碳气凝胶（CA）支撑铜和铁催化剂。催化剂的物理表征采用 ICP-MS、XRD、TEM、XPS、SEM 和 EDX，电化学表征采用 CV、chronoamperometry 和 EIS。成分为 Cu30Fe70/CA 的催化剂对 OER 表现出卓越的活性，过电位（345 mV）和塔菲尔斜率（92.5 mV dec-1）均较低。Cu30Fe70/CA 改性玻璃碳电极的扩散系数（D° = 2.1 × 10-8 cm2 s-1）、质量传输系数（mT = 2.8 × 10-4 cm s-1）、异质速率常数（k° = 5.7 × 10-4 cm s-1）和电化学活性表面积（0.0167 cm2）均已获得。非法拉第区的 CV 响应表明，与 Fe/CA 相比，Cu30Fe70/CA 的 Cdl 和电化学表面积（ECSA）增加了 34 倍。这项工作表明，在 Fe/CA 纳米复合材料中添加最适量的铜可为 OER 提供一种经济高效的电催化剂。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.