Cobalt oxide nanoparticles anchored polyaniline-appended cobalt tetracarboxy phthalocyanine, modified glassy carbon electrode for facile electrocatalysis of amitrole
Cobalt oxide nanoparticles were anchored on polyaniline-appended cobalt phthalocyanine and used to modify glassy carbon electrodes for enhanced electrocatalytic oxidation of amitrole. The modified electrodes were characterised by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. Cyclic voltammetry, linear sweep voltammetry, chronoamperometry and differential pulse voltammetry were used to evaluate the electrocatalytic behaviour of the designed sensors. Catalytic rate constant of 6.26 × 105 M−1 s−1 and apparent electron transfer rate constant of 8.84 × 10−3 cm s−1 were observed on CoTCPc-PANI-Co3O4NP-GCE. The adsorption equilibrium constant and Gibbs energy were 4.8 × 101 M−1 and − 12.1 kJ mol−1, respectively, confirming substrate adsorption during a spontaneous reaction on the surface of the modified electrode. The limit of detection and limit of quantification were 6.61 × 10−8 M and 2 × 10−7 M, respectively, for the electrocatalytic detection of amitrole and only suffered 4% signal loss after repetitive ten runs in 1 mM amitrole.
KeywordsAmitrole Electrooxidation Electrochemical sensor Polyaniline-appended cobalt phthalocyanine Cobalt oxide nanoparticles
We are grateful to the Department of Chemical Technology of Midlands State University, the technical staff and the Electron Microscopy Unit of Rhodes University for all their assistance during the varied analysis of our probes.
- 6.Mohammad AM, Awad MI, El-deab MS, Okajima T, Ohsaka T (2008) Electrocatalysis by nanoparticles: optimization of the loading level and operating pH for the oxygen evolution at crystallographically oriented manganese oxide nanorods modified electrodes. Electrochim Acta 53(13):4351–4358CrossRefGoogle Scholar
- 9.Sharifi SL, Shakur HR, Mirzaei A, Salmani A, Hosseini MH (2013) Characterization of cobalt oxide Co3O4 nanoparticles prepared by various methods: effect of calcination temperatures on size, dimension and catalytic decomposition of hydrogen peroxide. Int J Nanosci Nanotechnol 9:51–58Google Scholar
- 10.Zheng Y, Li P, Li H, Chen S (2014) Controllable growth of cobalt oxide nanoparticles on reduced graphene oxide and its application for highly sensitive glucose sensor. Int J Electrochem Sci 9:7369–7381Google Scholar
- 13.Devasenathipathy R, Mani V, Chen SM, Kohilarani K, Ramaraj S (2015) Determination of L-cysteine at iron tetrasulfonated phthalocyanine decorated multiwalled carbon nanotubes film modified electrode. Int J Electrochem Sci 10:682–690Google Scholar
- 16.Hosu IS, Wang Q, Vasilescu A, Peteu SF, Raditoiu V, Railian S, Zaitsev V, Turcheniuk K, Wang Q, Li M, Boukherroub R, Szunerits S (2015) Cobalt phthalocyanine tetracarboxylic acid modified reduced graphene oxide: a sensitive matrix for the electrocatalytic detection of peroxynitrite and hydrogen peroxide. RSC Adv 5(2):1474–1484CrossRefGoogle Scholar
- 25.Sakamoto K, Ohno-okumura E (2009) Syntheses and functional properties of phthalocyanines. Electrochem Soc Interface 2:1127–1179Google Scholar
- 31.Bard AJ, Faulkner LR (2001) Electrochemical methods: fundamentals and applications. Wiley, New YorkGoogle Scholar
- 35.Salimi A, Abdi K (2004) Enhancement of the analytical properties and catalytic activity of a nickel hexacyanoferrate modified carbon ceramic electrode prepared by two-step sol-gel technique: application to amperometric detection of hydrazine and hydroxyl amine. Talanta 63(2):475–483CrossRefGoogle Scholar