The coupling between inorganic semiconductor metal oxide and nanocarbon material is a proper route to fabricate efficient electrochemical sensors. Herein, the electrocatalytic oxidation, detection of nitrite ions (NO₂⁻) is investigated using reduced graphene oxide/mesoporous zinc oxide (rGO/ZnO) nanocomposite-modified glassy carbon electrode (GCE). The mesoporous ZnO and rGO were prepared via a modified sol-gel in presence of F127 structural template agent and modified Hummers’ methods, respectively. The rGO/ZnO nanocomposite was then produced via a simple ultrasonication and characterized using various analytical techniques to examine the morphology, structure and chemical constituents. The newly-developed rGO/ZnO/Nafion nanocomposite exhibited remarkable sensing response towards NO₂⁻ oxidation compared to bare GCE or ZnO/Nafion/GCE. The rGO/ZnO/Nafion/GCE sensor demonstrated a linear dynamic range between 200 and 4000 µM for linear sweep voltammetry (LSV) and 20 to 520 µM (for amperometry). Remarkable sensitivity and low limit of detection (LOD: at S/N = 3) were projected to be 0.3156 μAμM⁻¹cm⁻² and 1.18 μM for LSV, whereas values of 0.2754 μAμM⁻¹cm⁻² and 1.36 µM were obtained using the amperometric technique. The modified electrocatalyst demonstrated excellent operational stability, reproducibility and anti-interfering ability towards several common active species. The developed rGO/ZnO/GCE electrode represents a favorable strategy for efficient detection and quantification of NO₂⁻ by the electrochemical approach.

无机半导体金属氧化物和纳米碳材料之间的偶联是制造高效电化学传感器的正确途径。在本文中，电催化氧化，检测亚硝酸根离子的（NO ₂ ^- ）是使用还原氧化石墨烯/中孔氧化锌（RGO / ZnO）的纳米复合物改性的玻碳电极（GCE）调查。介孔ZnO和rGO分别是在F127结构模板剂和改良的Hummers方法的存在下，通过改良的溶胶-凝胶制备的。然后通过简单的超声处理生产rGO / ZnO纳米复合材料，并使用各种分析技术对其进行表征，以检查其形态，结构和化学成分。新开发的rGO / ZnO / Nafion纳米复合材料对NO ₂表现出显着的传感响应⁻与裸露的GCE或ZnO / Nafion / GCE相比氧化。rGO / ZnO / Nafion / GCE传感器的线性扫描伏安法（LSV）的线性动态范围为200至4000 µM，电流安培分析的线性动态范围为20至520 µM。显着的灵敏度和低检测限（LOD：在S / N = 3时）预计分别为0.3156μAμM- ¹ cm ^-2和1.18μM（对于LSV），而使用LSF分别获得0.2754μAμM ^-1 cm ^-2和1.36μM的值安培技术。改性的电催化剂对几种常见的活性物质表现出优异的操作稳定性，可重复性和抗干扰能力。研发的rGO / ZnO / GCE电极代表了有效检测和定量NO ₂的有利策略⁻通过电化学方法。