Ascorbic acid electrocatalytic activity in different electrolyte solutions using electrodeposited Co(OH)2
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The present paper describes the use of electrodeposited Co(OH)2 on transparent conducting fluorine-doped tin oxide electrode (FTO) as functional material for ascorbic acid electrooxidation in different electrolyte solutions. The structure, composition, and morphology of film were investigated through Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectrum (EDS), and scanning electron microscope (SEM). The electrochemical characterization in different electrolyte solutions was carried out by cyclic voltammetry (CV) and chronoamperometry. The voltammetric profile showed the presence of two possible reactions involving almost reversible redox processes during sweeping potential in KOH solution and a single redox process in KCl solution. The Co(OH)2 film presented electrocatalytic activity in ascorbic acid electrooxidation, being the sensitivity values found were 182.3 mA L mol−1 cm−2 and 119.4 mA L mol−1 cm−2 in KOH and KCl solutions, respectively. The results showed that the electrolytic solution strongly influenced the sensitivity of the FTO/Co(OH)2 film in ascorbic acid electrooxidation reaction. Kinetic studies showed that the electrode process was controlled by mass diffusion. In addition, chronoamperometric technique was carried out to verify the stability of the electrode. The obtained results reveal a good stability of electrode in the KCl solution; once in current density terms, the results are quite similar.
KeywordsElectrodeposited Cobalt hydroxide Electrooxidation Ascorbic acid
Marcelo R. Silva would like to thank CNPQ for scholarship granted.
This work is financially supported by CNPQ (406459/2016-9), Fundação Araucária (15585/2010), and NEMAN (Pronex, 17378/2009).
- 5.Hussain MZ, Ghani QP, Hunt TK (1989) Inhibition of prolyl hydroxylase by poly(ADP-ribose) and phosphoribosyl-AMP. Possible role of ADP-ribosylation in intracellular prolyl hydroxylase regulation. J Biol Chem 264:7850–7855Google Scholar
- 7.Barbul A (1990) Immune aspects of wound repair. Clin Plast Surg 17:433–442Google Scholar
- 25.Hasanzadeh M, Karim-Nezhad G, Shadjou N, Hajjizadeh M, Khalilzadeh B, Saghatforoush L, Abnosi MH, Babaei A, Ershad S (2009) Cobalt hydroxide nanoparticles modified glassy carbon electrode as a biosensor for electrooxidation and determination of some amino acids. Anal Biochem 389:130–137CrossRefGoogle Scholar
- 31.Vidotti M. Van Greco C, Ponzio EA, Torresi SIC (2006) Electrochem Commun 8:554–560Google Scholar
- 33.Maile NC, Koli RR, Mamlayya VB, Chougale UM, Fulari VJ (2017) Bulletin of Laser and Spectroscopy Society of India 23:63–70Google Scholar