Nickel Flower/Conducting Polymer Composite for Effective Ethanol Electrooxidation in Alkaline Medium

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-04-17 DOI:10.1007/s12678-024-00868-9

Mahmoud A. Hefnawy, Rewaida Abdel-Gaber, Nawal Al-Hoshani, Shymaa S. Medany

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Abstract

The growing interest in energy demand became an important issue for several sectors like industry and transportation. Recently, fuel cells generated a new solution for global energy deficiency. Therefore, we developed a new catalyst for fuel cell applications that included nickel oxide nanoflower with polyaniline to enhance the electrooxidation of ethanol. The structure of the modified electrode was characterized by X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR). At the same time, surface morphology and structural thermal stability were utilized by Scanning electron spectroscopy (SEM) and Thermal gravimetric analysis (TGA), respectively. Otherwise, ethanol electrooxidation was studied by several electrochemistry techniques like cyclic voltammetry (CVs) and chronoamperometry (CA). The activity of the electrocatalyst toward ethanol conversion reached 32 mA cm⁻² at a potential of 0.46 V (vs. Ag/AgCl). The effect of changing the thickness of the conducting polymer was studied to find out the optimum catalysis condition. Several chemical kinetics were calculated, like diffusion coefficient (D), Tafel slope, and transfer coefficient. The long-term stability of the modified electrode for 240 min. Whereas the anodic current decreased by 15% after continuous oxidation of ethanol in an alkaline medium.

Graphical Abstract

Abstract Image

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在碱性介质中有效进行乙醇电氧化的镍花/导电聚合物复合材料

对能源需求的日益关注已成为工业和交通等多个领域的重要问题。最近，燃料电池为解决全球能源短缺问题提供了新的解决方案。因此，我们开发了一种用于燃料电池应用的新型催化剂，其中包括纳米氧化镍和聚苯胺，以增强乙醇的电氧化作用。我们利用 X 射线光电子能谱（XPS）和红外光谱（IR）对修饰电极的结构进行了表征。同时，扫描电子显微镜（SEM）和热重分析（TGA）分别对表面形貌和结构热稳定性进行了分析。此外，还采用了多种电化学技术，如循环伏安法（CVs）和时变分析法（CA），对乙醇的电氧化作用进行了研究。在 0.46 V 的电位下，电催化剂的乙醇转化活性达到 32 mA cm-2（相对于 Ag/AgCl）。为了找出最佳催化条件，研究了改变导电聚合物厚度的影响。计算了几种化学动力学，如扩散系数（D）、塔菲尔斜率和转移因子。改性电极的长期稳定性为 240 分钟。在碱性介质中连续氧化乙醇后，阳极电流下降了 15%。

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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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