High-Reproducibility and -Stability All-Solid-Contact Nitrate Ion-Selective Electrode with CoWSe₂ as Solid Contact for Nitrate Monitoring in Wetland Soil

ACS Sensors, Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

The monitoring of nitrate ions is great significance for human health, agricultural development, and environmental protection. All-solid-state ion-selective electrodes (ASS-NO3--ISEs), as an important NO3- analysis method, still have two challenges poor stability reproducibility due to the ill-defined phase boundary between solid-contact (SC) layer membrane (ISM). In this work, a novel strategy constructing ASS-NO3--ISEs based on CoWO4, CoWS4, CoWSe2, or CoSe2 SC layers was reported improving reproducibility. result shows that developed CoWSe2-based NO3--ISE exhibits good Nernstian response slope -61.9 ± 0.4 mV dec-1 in activity range from 1.0 × 10-6 7.5 10-2 M detection limit M. A long-term (as low 2.3 μV h-1) primary reason high redox capacitance ternary selenide. Experimental results show surprisingly approximately 0.5 five individual ASS-NO3--ISEs. Notably, electrochemical experiments scanning electron microscopy mapping tests are used predict ion-electron transduction mechanism which lipophilic anion (tetrakis(4-chlorophenyl)borate) participates process at SC/ISM interface stabilize electrode potential provide It further proved introduction CoWSe2 maintains excellent anti-interference water layers, light, gas. Hence, achieve accurate free wetland soil estuary Yellow River delta.

Language: Английский

New trends in potentiometric sensors: From design to clinical and biomedical applications

Talanta, Journal Year: 2025, Volume and Issue: 287, P. 127623 - 127623

Published: Feb. 1, 2025

Language: Английский