PDF(Pubmed)
Abstract：
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 mM-1cm-2. 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.
摘要：
在电化学亚硝酸盐检测领域，亚硝酸盐的强氧化性质通常需要在高检测电位下操作。然而,本研究介绍了一种新的方法来解决这一挑战，通过开发具有低还原检测电位的高灵敏度电化学传感器。具体来说,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),利用铜的高占有率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显著的性能,具有-0.05V的低检测电位vs.Hg/HgO,宽线性范围为10~1000μM，令人印象深刻的检测限为0.079μM（S/N=3），和2140μAmM-1cm-2的高灵敏度。这些发现强调了通过催化还原作为降低传感器操作电压的手段的电化学亚硝酸盐检测的功效。通过展示这一战略的成功实施，这项工作为电化学低电位亚硝酸盐检测方法的发展树立了宝贵的先例。
