Nanostructured Alpha-Nickel Hydroxide Electrodes for High Performance Hydrogen Peroxide Sensing

Author(s)

Martins, Paulo Roberto ^[1] ; Nery Motta, Alessandra Goncalves ^[1] ; Nakamura, Marcelo ^[1] ; Araki, Koiti ^[1] ; Angnes, Lucio ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, Sao Paulo - Brazil

• Document type: Journal article
• Source: Electroanalysis; v. 25, n. 9, p. 2060-2066, SEP 2013.
• Web of Science Citations: 7

Abstract

Nanostructured alpha-nickel hydroxide (-Ni(OH)(2)) immobilized on a Fluorine-doped Tin Oxide (FTO) surface was explored for the construction of hydrogen peroxide amperometric Flow Injection Analysis (FIA) sensors. Their notable electrocatalytic activity and heterogeneous electron-transfer rate were confirmed by the appearance of a broad and intense peak associated with the oxidation of hydrogen peroxide and the enhancement of sensibility in hydrodynamic conditions. The -Ni(OH)(2) electrodes exhibited a broad dynamic range (5x10(-6) to 1x10(-3)molL(-1)), low detection limit (2x10(-7)molL(-1)), good repeatability (RSD=1.29% for 20 successive analyses), and a sensitivity greater than 500 mu A mmol(-1)L(-1)cm(-2). (AU)

• FAPESP's process: 11/21227-8 - Development of amperometric sensors based on mixed sol of a-NiCo(OH)2 and nickel/cobalt oxides and their association with carbon nanotubes/graphene
• Grantee: Paulo Roberto Martins
• Support Opportunities: Scholarships in Brazil - Post-Doctoral