pH-regulated synthesis of CuOx/ERGO nanohybrids with tunable electrocatalytic oxidation activity towards nitrite sensing
pH-regulated synthesis of CuOx/ERGO nanohybrids with tunable electrocatalytic oxidation activity towards nitrite sensing
复制标题
pH 调节的 CuOx/ERGO 纳米杂化物的合成，具有针对亚硝酸盐传感的可调电催化氧化活性
DOI：
10.1039/c9nj00474b
复制
发表时间：
2019-03-28
影响因子：
3.3
通讯作者：
Bai, Yanhong
中科院分区：
文献类型：
--
作者：
Yue, Xiaoyue;Luo, Xiaoyu;Bai, Yanhong
设计低成本、高效率的电极材料是电化学传感器制造中一项紧迫而又具有挑战性的任务。本文提出了一种pH调节的电沉积方法，用于简单地合成CuOx/电化学还原氧化石墨烯（ERGO）纳米杂化物。此外，还研究了CuOx/ERGO纳米杂化材料的结构与性能之间的关系。结果表明，CuOx/ERGO纳米杂化电化学传感器对亚硝酸根离子具有不同的催化能力，其顺序为蜂窝状结构>牡丹状结构>玫瑰花状结构>紫薇花状结构.蜂窝状的CuOx/ERGO纳米杂化材料被用于制造电化学传感器。该传感器不仅在0.1-100 M的线性范围内实现了亚硝酸盐的准确和灵敏的检测，低检测限为0.072 M，而且还可以应用于饮用水和肉类样品中亚硝酸盐的检测，具有可接受的回收率和稳定性。该方法对环境和食品中亚硝酸盐的现场安全监管具有潜在的应用价值。研究该电极修饰材料的结构-性能关系，对于开发电催化氧化亚硝酸根的新方法具有一定的理论价值。
Designing low-cost and effective electrode materials is a pressing but challenging task for fabricating electrochemical sensors. Herein, a pH-regulated electrodeposition method was proposed for the facile synthesis of CuOx/electrochemically reduced graphene oxide (ERGO) nanohybrids. Besides, the relationships between the structures of CuOx/ERGO nanohybrids and the corresponding properties were investigated. It was found that the CuOx/ERGO nanohybrid-based electrochemical sensor displayed different catalytic abilities towards nitrite sensing, following the order honeycomb-like structure > peony-like structure > rose flower-like structure > crape myrtle flower-like structure. Honeycomb-like CuOx/ERGO nanohybrids were used to fabricate an electrochemical sensor. This sensor not only achieved accurate and sensitive detection of nitrite in a wide linear range of 0.1-100 M with a low detection limit of 0.072 M but could also be applied in the detection of nitrite in drinking water and meat samples with acceptable recovery and stability. The established method may have potential application value for on-site safety regulation on nitrite in the environment and food. And, research on the structure-property relationship of the electrode modified material has certain theoretical value for the development of new methods for electrocatalytic nitrite oxidation.