Green Synthesis of Cobalt Oxide Decorated Chitosan Substrates for Electrochemical Detection of Nitrite and Hydrogen Evolution Reactions

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-09-26 DOI:10.1007/s12678-024-00889-4

Mahmoud A. Hefnawy, Rewaida Abdel-Gaber, Sobhi M. Gomha, Magdi E. A. Zaki, Shymaa S. Medany

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Abstract

The Co₂O₃-Chitosan composite (Co@Chitosan) nanoparticles were synthesized through a green approach. The composite under investigation was characterized by various analytical methods, including scanning electron microscopy (SEM), transmitted electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM) confirming the preparation step. The modified composite’s performance was evaluated for its potential applications in nitrite sensing and hydrogen production by utilizing diverse electrochemical methodologies. The Co₂O₃-Chitosan that has been modified exhibits a linear detection range of 0.25–100 µM and a limit of detection (LOD) of 0.117 µM with a response time of approximately 5 s using the amperometry technique. Furthermore, the utilization of Co₂O₃-Chitosan composite as a proficient catalyst for hydrogen generation in an alkaline environment was implemented. The electrode exhibited enduring stability in fuel generation and heightened energy safeguarding. The current density of the electrode was observed to attain a value of \(\upeta\) ₅₀ at − 0.55 and − 0.43 V (versus RHE) for Co₂O₃ and Co@Chitosan, respectively. The study investigated the durability of electrodes during extended periods of constant potential chronoamperometry lasting 6 h. The Co₂O₃ and Co@Chitosan exhibited a reduction in initial current by 11% and 7%, respectively.

Graphical Abstract

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用于亚硝酸盐和氢进化反应电化学检测的氧化钴装饰壳聚糖基底的绿色合成技术

通过绿色方法合成了 Co2O3-壳聚糖复合纳米粒子（Co@壳聚糖）。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）和原子力显微镜（AFM）等多种分析方法对所研究的复合材料进行了表征，确认了制备步骤。通过采用不同的电化学方法，对改性复合材料在亚硝酸盐传感和制氢方面的潜在应用进行了性能评估。使用安培计技术，经修饰的 Co2O3-Citosan 的线性检测范围为 0.25-100 µM，检测限 (LOD) 为 0.117 µM，响应时间约为 5 秒。此外，还将 Co2O3-Citosan 复合材料用作在碱性环境中制氢的高效催化剂。该电极在燃料生成方面表现出持久的稳定性和更高的能量保障。据观察，Co2O3 和 Co@ 壳聚糖电极的电流密度分别在 - 0.55 和 - 0.43 V（相对于 RHE）时达到 50。该研究调查了电极在持续 6 小时的恒电位计时法中的耐用性。Co2O3 和 Co@ 壳聚糖的初始电流分别降低了 11% 和 7%。

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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

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.