Preparation, Electrochemical Behavior and Electrocatalytic Activity of a Copper Hexacyanoferrate Modified Ceramic Carbon Electrode

Abstract

A copper hexacyanoferrate modified ceramic carbon electrode (CuHCF/CCE) had been prepared by two-step sol-gel technique and characterized using electrochemical methods. The resulting modified electrode showed a pair of well-defined surface waves in the potential range of 0.40 to 1.0 V with the formal potential of 0.682 V (vs. SCE) in 0.050 mol•dm -3 HOAc-NaOAc buffer containing 0.30 mol•dm -3 KCl. The charge transfer coefficient (α) and charge transfer rate constant (k s ) for the modified electrode were calculated. The electrocatalytic activity of this modified electrode to hydrazine was also investigated, and chronoamperometry was exploited to conveniently determine the diffusion coefficient (D) of hydrazine in solution and the catalytic rate constant (k cat ). Finally, hydrazine was determined with amperometry using the resulting modified electrode. The calibration plot for hydrazine determination was linear in 3.0×10 -6 -7.5×10 -4 mol•dm -3 with the detection limit of 8.0×10 -7 mol•dm -3 . This modified electrode had some advantages over the modified film electrodes constructed by the conventional methods, such as renewable surface, good long-term stability, excellent catalytic activity and short response time to hydrazine.

Electrochemical preparation of copper hexacyanoferrate nanoparticles under the synergic action of EDTA and HAuCl4

“…The deposition of CuHCF in the presence of EDTA was conducted similar to the above procedure but not contained HAuCl 4 . As far as the deposition of CuHCF in the absence of HAuCl 4 and EDTA, the deposition solution only contained 1.0 Â 10 À3 mol L À1 Cu(NO 3 ) 2 , 1.0 Â 10 À3 mol L À1 K 3 Fe(CN) 6 and 0.10 mol L À1 KCl. The deposition of CuHCF on gold film modified CCE was conducted as follows: firstly, the gold film was deposited by potential cycling a certain cycles between 0.9 and À0.2 V in a solution contained 3.0 Â 10 À4 mol L À1 HAuCl 4 and 0.10 mol L À1 KCl (pH 2.00).…”

“…The deposition of CuHCF on gold film modified CCE was conducted as follows: firstly, the gold film was deposited by potential cycling a certain cycles between 0.9 and À0.2 V in a solution contained 3.0 Â 10 À4 mol L À1 HAuCl 4 and 0.10 mol L À1 KCl (pH 2.00). Secondly, the Au/CCE was cycled in 1.0 Â 10 À3 mol L À1 Cu(NO 3 ) 2 , 1.0 Â 10 À3 mol L À1 EDTA, 1.0 Â 10 À3 mol L À1 K 3 Fe(CN) 6 and 0.10 mol L À1 KCl (pH 2.00). After the formation of CuHCF, the electrodes were rinsed carefully with water and then activated in 0.10 mol L À1 KCl solution at the potential range of 0.9 and À0.2 V.…”

“…Among these mediators, Metal hexacyanoferrates (MHCF), a class of polynuclear mixed-valence compounds, have attracted much attention due to the pioneering work on electrochemical characterization of Prussian blue (PB) reported by Neff and Itaya [1,2]. Immobilization of MHCF species on the electrode surface can be achieved by mechanically attachment [3], electrodeposition [4], entrapping them into polymeric matrices [5] or encapsulating in sol-gels [6], self-assembled monolayer [7,8]. In these methods, electrodeposition of MHCF on the substrate surface from a solution containing M n+ ions and ferricyanide with an excess supporting electrolytes ions is usually used due to the simple preparation procedure [9][10][11].…”

Bismuth hexacyanoferrate-modified carbon ceramic electrodes prepared by electrochemical deposition and its electrocatalytic activity towards oxidation of hydrazine

“…The analytical parameters in our system are comparable or even better than results previously reported for the determination of hydrazine. Moreover, the overpotential for hydrazine oxidation with BiHCF-modified CCE is considerably reduced when compared with other transition MHCFs modified electrodes [14,[18][19][20][21][41][42][43].…”

Pulse anodic stripping voltammetric determination of copper with an amoxicillin–nafion modified glassy carbon electrode

“…Many substances, such as Alga, N-phenylcinnamohydroxamix acid, N-acetyl-1-cysteine, 10-phenan-throline, Cysteine, Natural ionic polysaccharides, Sphagnum peat moss, 1,2-bis-methyl (2-aminocyclopentene-carbodithioate) ethane, Salicylideneamino-2-thiophenol, Diquinolyl-8,8 0 -disulfide, polypyrrole pyrocatechol violet, N-(2-hydroxybenzyl) chitosan, p-tertButylthiacalix(4)arene, Calix(4)arene, Hexacyanoferrate, 2-aminothiazole organofunctionalized silica, Tetraethyl thiuram disulfide and Tetraphenylporphyrin have been used to fabricate CME for the determination of copper [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”