AbstractThe authors describe a method for synthesis of a three-dimensional (3D) interconnected carbon nanorod aerogel (3D-ICNA) starting from wax gourd (Benincasa hispida) which is a low-cost biomass. The 3D-ICNA possesses unique 3D interconnected and porous nanostructure, with abundant edge-plane-like defective sites, a large specific surface area (823 m2 g−1) and a large pore volume (0.12 cm3 g−1). This makes the material attractive in terms of electrochemical sensing. To validate the feasibility, the voltammetric response towards ferricyanide, hydrogen peroxide (H2O2), acetaminophen, ascorbic acid (AA), dopamine, uric acid and epinephrine was investigated by using a glassy carbon electrode (GCE) modified with 3D-ICNA. The modified GCE shows higher electron-transfer capacity than a conventional GCE. In addition, as an electrochemical sensor for AA or H2O2, the electrode exhibits better analytical performance with lower detection limit [3.5 μM for AA or 0.68 μM for H2O2 based on 3σ/m criterion (where σ is the standard deviation of the blank and m is the slope of the calibration plot)], wider linear range and higher sensitivity (0.14, 0.11 and 0.080 μA μM−1 cm−2 for AA or 0.24 and 0.20 μA μM−1 cm−2 for H2O2) compared to a plain GCE or a carbon nanotube-modified GCE. The modified GCE exhibits a large potential for the amperometric determination of AA or H2O2 in real samples. Graphical abstractBy employing the biomass of wax gourd (Benincasa hispida) as the precursor, a three-dimensional interconnected carbon nanorod aerogel was prepared. It is shown to be a viable material for the construction of an advanced electrochemical sensor for H2O2 and ascorbic acid.

中文翻译：

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用于电流传感的冬瓜三维互连碳纳米棒气凝胶的合成

摘要作者描述了一种以低成本生物质冬瓜 (Benincasa hispida) 为原料合成三维 (3D) 互连碳纳米棒气凝胶 (3D-ICNA) 的方法。3D-ICNA 具有独特的 3D 互连和多孔纳米结构，具有丰富的边缘平面状缺陷位点、大比表面积 (823 m2 g-1) 和大孔体积 (0.12 cm3 g-1)。这使得该材料在电化学传感方面具有吸引力。为了验证可行性，通过使用 3D-ICNA 修饰的玻璃碳电极 (GCE) 研究了对铁氰化物、过氧化氢 (H2O2)、对乙酰氨基酚、抗坏血酸 (AA)、多巴胺、尿酸和肾上腺素的伏安响应。改进的 GCE 显示出比传统 GCE 更高的电子转移能力。此外，作为 AA 或 H2O2 的电化学传感器，该电极表现出更好的分析性能，检测限较低 [AA 为 3.5 μM，H2O2 为 0.68 μM，基于 3σ/m 标准（其中 σ 是空白的标准偏差，m 是斜率）校准曲线）]，与普通 GCE 或碳相比，更宽的线性范围和更高的灵敏度（AA 为 0.14、0.11 和 0.080 μA μM-1 cm-2，H2O2 为 0.24 和 0.20 μA μM-1 cm-2）纳米管修饰的 GCE。改进的 GCE 在实际样品中的 AA 或 H2O2 的电流测定方面表现出很大的潜力。图解摘要以冬瓜(Benincasa hispida)的生物质为前驱体，制备了三维互连的碳纳米棒气凝胶。它被证明是构建用于 H2O2 和抗坏血酸的先进电化学传感器的可行材料。