Zinc oxide-modified glass-coated tin-doped indium oxide electrode for the electrocatalytic reduction of hydrogen peroxide in neutral media

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-09-17 DOI:10.1016/j.jwpe.2025.108748

Nadia Ait Ahmed , Katia Hebbache , Abderrezak Lahreche , Samia Kerakra , Katia Nasri , Nabila Aliouane , Carine Chassigneux , Marielle Eyraud

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Abstract

This study investigates the electrodeposition of nanostructured zinc oxide (ZnO) films on indium tin oxide (ITO)-coated glass substrates to develop an electrocatalytic sensor for hydrogen peroxide (H₂O₂) detection in neutral media. Optimal deposition conditions, −1.0 V versus SCE (saturated calomel electrode) for 10 min, produced ZnO/ITO glass electrodes with the highest H₂O₂ reduction activity. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses confirmed the formation of homogeneous, well-adhered wurtzite-structured ZnO films on the ITO substrate.

The performance of the modified electrode was strongly influenced by phosphate buffer solution (PBS), with 0.1 M at pH 7 providing the optimal response. Electrochemical tests demonstrated a linear response for H₂O₂ concentrations ranging from 0.0625 to 5.00 mM (R² = 0.9988), with a sensitivity of 44.7 μA·mM⁻¹·cm⁻² and a detection limit (LOD) of 14.8 μM.

Kinetic studies revealed an electron transfer coefficient (α) of 0.711 and a diffusion coefficient (D) of 3.8 × 10⁻⁷ cm²·s⁻¹. The sensor retained >95 % of its initial current, showed excellent selectivity against ascorbic acid, glucose, uric acid, and nitrite, and accurately detected H₂O₂ in tap water and pharmaceutical samples. These findings position the ZnO/ITO glass platform as a cost-effective, reliable, and scalable solution for in situ H₂O₂ monitoring in water treatment and other neutral aqueous applications.

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氧化锌修饰玻璃包覆锡掺杂氧化铟电极，用于中性介质中过氧化氢的电催化还原

本研究将纳米氧化锌（ZnO）薄膜电沉积在氧化铟锡（ITO）涂层的玻璃衬底上，以开发一种在中性介质中检测过氧化氢（H2O2）的电催化传感器。最佳沉积条件为−1.0 V vs SCE（饱和甘汞电极）10 min，制备的氧化锌/ITO玻璃电极具有最高的H2O2还原活性。扫描电镜（SEM）和x射线衍射（XRD）分析证实，在ITO衬底上形成了均匀的、粘附良好的纤锌矿结构ZnO薄膜。磷酸盐缓冲溶液（PBS）对修饰电极的性能影响很大，pH值为7时，0.1 M的修饰电极反应最佳。电化学测试结果表明，对H2O2浓度在0.0625 ~ 5.00 mM范围内呈线性响应（R2 = 0.9988），灵敏度为44.7 μA·mM−1·cm−2，检出限（LOD）为14.8 μM。动力学研究表明，电子传递系数（α）为0.711，扩散系数(D)为3.8 × 10−7 cm2·s−1。该传感器保留了95%的初始电流，对抗坏血酸、葡萄糖、尿酸和亚硝酸盐具有良好的选择性，并能准确检测自来水和药品样品中的H2O2。这些发现将ZnO/ITO玻璃平台定位为水处理和其他中性水应用中原位H₂O₂监测的经济、可靠和可扩展的解决方案。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies