Three porous materials (Cu, a Cu-Ni alloy with 70 at.% Cu and Rh-modified Cu) have been tested as electrodes for the electroanalysis of nitrate and nitrite ions, in either neutral or basic media, using mainly a flow injection technique. Porous Cu and Cu-Ni were prepared by electrodeposition at high current density, exploiting the transient template action of hydrogen bubbles. Rh-modified Cu electrodes were obtained from porous Cu, through a galvanic displacement reaction. All materials had a linear response for both nitrates and nitrites, at concentrations up to 10−3 M, at least. Sensitivities, detection limits and stability were determined. Compared with Cu, used as a benchmark, (i) Rh-modified Cu had higher sensitivity for nitrates, comparable sensitivity for nitrites, lower or comparable detection limits and overall better stability; (ii) Cu-Ni had lower sensitivity, but exhibited lower detection limits and more stable performance for most analyte/medium combinations.
Study of Cu, Cu-Ni and Rh-modified Cu porous layers as electrode materials for the electroanalysis of nitrate and nitrite ions / Comisso, Nicola; Cattarin, Sandro; Guerriero, Paolo; Mattarozzi, Luca; Musiani, Marco*; Vázquez-Gómez, Lourdes; Verlato, Enrico. - In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY. - ISSN 1432-8488. - ELETTRONICO. - 20:4(2016), pp. 1139-1148. [10.1007/s10008-015-2915-7]
Study of Cu, Cu-Ni and Rh-modified Cu porous layers as electrode materials for the electroanalysis of nitrate and nitrite ions
Verlato, Enrico
2016
Abstract
Three porous materials (Cu, a Cu-Ni alloy with 70 at.% Cu and Rh-modified Cu) have been tested as electrodes for the electroanalysis of nitrate and nitrite ions, in either neutral or basic media, using mainly a flow injection technique. Porous Cu and Cu-Ni were prepared by electrodeposition at high current density, exploiting the transient template action of hydrogen bubbles. Rh-modified Cu electrodes were obtained from porous Cu, through a galvanic displacement reaction. All materials had a linear response for both nitrates and nitrites, at concentrations up to 10−3 M, at least. Sensitivities, detection limits and stability were determined. Compared with Cu, used as a benchmark, (i) Rh-modified Cu had higher sensitivity for nitrates, comparable sensitivity for nitrites, lower or comparable detection limits and overall better stability; (ii) Cu-Ni had lower sensitivity, but exhibited lower detection limits and more stable performance for most analyte/medium combinations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.