Zhao Xing, Zhou Guangfeng, Qin Sitao, Zhang Jingwen, Wang Guanda, Gao Jie, Suo Hui, Zhao Chun
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Sensors (Basel). 2024 Jun 29;24(13):4247. doi: 10.3390/s24134247.
In the realm of electrochemical nitrite detection, the potent oxidizing nature of nitrite typically necessitates operation at high detection potentials. However, this study introduces a novel approach to address this challenge by developing a highly sensitive electrochemical sensor with a low reduction detection potential. Specifically, a copper metal nanosheet/carbon paper sensitive electrode (Cu/CP) was fabricated using a one-step electrodeposition method, leveraging the catalytic reduction properties of copper's high occupancy d-orbital. The Cu/CP sensor exhibited remarkable performance in nitrite detection, featuring a low detection potential of -0.05 V vs. Hg/HgO, a wide linear range of 10~1000 μM, an impressive detection limit of 0.079 μM (S/N = 3), and a high sensitivity of 2140 μA mMcm. These findings underscore the efficacy of electrochemical nitrite detection through catalytic reduction as a means to reduce the operational voltage of the sensor. By showcasing the successful implementation of this strategy, this work sets a valuable precedent for the advancement of electrochemical low-potential nitrite detection methodologies.
在电化学亚硝酸盐检测领域，亚硝酸盐强大的氧化性通常需要在高检测电位下进行操作。然而，本研究引入了一种新颖的方法来应对这一挑战，即开发一种具有低还原检测电位的高灵敏度电化学传感器。具体而言，采用一步电沉积法制备了铜金属纳米片/碳纸敏感电极（Cu/CP），利用铜高占据d轨道的催化还原特性。Cu/CP传感器在亚硝酸盐检测中表现出卓越的性能，相对于Hg/HgO的低检测电位为-0.05 V，线性范围宽达10~1000 μM，令人印象深刻的检测限为0.079 μM（S/N = 3），灵敏度高达2140 μA mM⁻¹cm⁻²。这些发现强调了通过催化还原进行电化学亚硝酸盐检测作为降低传感器工作电压手段的有效性。通过展示该策略的成功实施，这项工作为电化学低电位亚硝酸盐检测方法的进步树立了宝贵的先例。
