A ternary nanocomposite electrode of polyoxometalate/carbon nanotubes/gold nanoparticles for electrochemical detection of hydrogen peroxide

Abstract

In this work, a nanocomposite film electrode containing polyoxometalate (POM) clusters K₆P₂W₁₈O₆₂ (P₂W₁₈), carbon nanotubes (CNTs) and Au nanoparticles (AuNPs) was fabricated by a smart combination of layer-by-layer (LbL) with the self-assembly technique. The synergistic effect of POM, CNTs and AuNPs on the electrocatalysis of H₂O₂ was investigated to improve the sensitivity of H₂O₂ detection. The response of (P₂W₁₈/CNTs/P₂W₁₈/AuNPs)₄ electrodes to H₂O₂ was remarkably enhanced due to large active sites and good electron conducting ability. The sensor exhibited a quick response (less than 1 second) to H₂O₂ with a high sensitivity (596.1 μAm M⁻¹ cm⁻²), and a low detection limit (52 nM). Based on the respective advantages of POMs, CNTs and AuNPs, the nanocomposite multilayer POMs/CNTs/POMs/AuNPs will have special properties and high potential for application.