An Original Nitrate Sensor Based On Silver Nanoparticles Electrodeposited On A Gold Electrode

Katia Fajerwerg (1) , V. Ynam (1, 2) , Bruno Chaudret (1) , V. Garcon (3) , D. Thouron (3) , M. Comtat (4)

1 LCC - Laboratoire de chimie de coordination
2 LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
3 DYNBIO LEGOS
4 LGC - Laboratoire de Génie Chimique

The electroreduction of nitrate in synthetic seawater was investigated by cyclic voltammetry (CV) at a bare gold electrode modified by electrodeposited silver nanoparticles (AgNPs). The AgNPs were generated by chronoamperometry using a charge. Q lower than the theoretical one corresponding to a silver monolayer. In these conditions, a linear range for nitrate determination is obtained from 10.10(-6) mol L(-1) to 10-10(-3) mol L(-1). Such a low limit of detection was achieved due to the combination of two chemical reactions coupled with electron transfer.

Mots clés: Silver electrodeposition; Gold electrode; Nitrate detection; Electrocatalysis; Copper modified electrode; Hydrogen-peroxide; Peroxynitrous acid; Nitrite; Reduction; Electroreduction; Decomposition; Size

Domaines: Chimie de coordination

Katia Fajerwerg, V. Ynam, Bruno Chaudret, V. Garcon, D. Thouron, et al.. An Original Nitrate Sensor Based On Silver Nanoparticles Electrodeposited On A Gold Electrode. Electrochemistry Communications, 2010, 12 (10), pp.1439-1441. ⟨10.1016/j.elecom.2010.08.003⟩. ⟨hal-00998627⟩