The electrochemical determination of formaldehyde in aqueous media using nickel modified electrodes

SENSORS AND ACTUATORS B-CHEMICAL

卷:270

Article

TrivediJ, Dhruv¹  Crosse, John²  Tanti, Jonathon¹  Cass, Alise J.¹  Toghill, Kathryn E.¹ 

[1] Univ Lancaster, Dept Chem, Lancaster, England

[2] Univ Lancaster, Lancaster Environm Ctr, Lancaster, England

关键词: Nickel catalyst;    Electrocatalysis;    Formaldehyde;    Non-enzymatic;    CO2 reduction;    Hantzsch;   

DOI  :  10.1016/j.snb.2018.05.035

来源: Elsevier

【 摘 要 】

Glassy carbon (GC) electrodes were modified with nickel metal via a simple deposition procedure, followed by enrichment of the nickel in a potassium hydroxide solution to deliver the catalytic nickel hydroxide species (Ni(OH)(2)). In solutions of 1 M KOH, the nickel modified GC electrode (Ni-GC) contained a reproducible detection limit of the order of 1.1 x 10(-5) M for formaldehyde additions. This is comparable and, in many cases, surpasses, platinum group metal modified electrodes. The potentiometric analytical method also allowed for the accurate determination of unknown formaldehyde concentrations, over a linear range of 1 x 10(-5)-1 x 10(-3)M and a sensitivity of 22.7 +/- 3.8 A/mM. Furthermore, the Ni-GC electrode showed negligible response to formate and methanol, even when they were present in concentrations 10 times greater than the formaldehyde. The electrochemical performance was compared to a simple colorimetric approach to formaldehyde determination, wherein a detection limit of 6 x 10(-6) M was obtained.

【 授权许可】

Free