In situ precipitation of Nickel-hexacyanoferrate within multi-walled carbon nanotube modified electrode and its selective hydrazine electrocatalysis in physiological pH

Kumar, Annamalai Senthil; Barathi, Palani; Pillai, K. Chandrasekara

doi:10.1016/j.jelechem.2011.01.022

Cited by 49 publications

(7 citation statements)

References 49 publications

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“…The sharp, well-defined NiHCF peaks in the samples’ characteristic XRD diffractograms (Figure A,B) show that these films are crystalline. The XRD peaks matched the literature and ICSD database well. ,, Despite the use of a fixed grazing incident angle of 3°, diffraction peaks of the subjacent gold electrode and quartz substrate overlay most of the NiHCF peaks. Only the (200) NiHCF peak at 8.2° was appropriate for analysis because of its high intensity.…”

Section: Results and Discussionsupporting

confidence: 63%

“…The resulting competition between Na 2 SO 4 and ACN for water molecules might negatively affect deintercalation of Na ions. The hydration shell of Na + , which is rejected during intercalation, is impaired in its formation upon deintercalation and rehydration of Na ions. First, this is because the ACN molecules hinder the formation of the hydrogen-bond network in the solvation shell.…”

Section: Results and Discussionmentioning

confidence: 99%

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Electrodeposited Na₂Ni[Fe(CN)₆] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

et al. 2018

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Na-ion batteries have recently attracted great attention regarding their application in large-scale energy storage systems. Among different types of electrode materials for those classes of batteries, so-called Prussian blue analogues (PBAs) are among the very attractive ones due to their comparatively simple and low-cost methods of synthesis coupled with a promising cycle performance. In this study, one of the state-of-the-art PBA battery materials, namely electrodeposited Na 2 Ni[Fe(CN) 6 ] (NiHCF) thin films, were tested under simulated battery conditions in aqueous and mixed (H 2 O/organic) electrolytes. Prolonged stability tests in aqueous electrolytes were performed together with in-operando electrochemical AFM monitoring. It is demonstrated that degradation of this material is not associated with noticeable morphological changes (mechanical stress) but is likely caused by changes in the chemical composition of the films. Intercalation and deintercalation reversibility of Na + and thin film stability in aqueous electrolytes appear to be unaffected negatively by changes in the pH to values below 7. However, the films showed unstable behavior in basic media (pH > 10). The increase of the content of acetonitrile, which was used as an additive to simulate the influence of antifreezes in aqueous electrolytes, appears to primarily affect the deintercalation of Na ions in Na 2 SO 4 -based aqueous electrolytes.

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Section: Results and Discussionsupporting

confidence: 63%

Section: Results and Discussionmentioning

confidence: 99%

Electrodeposited Na₂Ni[Fe(CN)₆] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

et al. 2018

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“…It is a typical example for the surface-saturation-based reaction kinetics involving Michaelis-Menten type of reaction mechanism. [53][54][55] To understand the electrochemical kinetics, effect of scan rate was carried out with GCE/ MWCNT@PB in the presence of 500 μM of H 2 O 2, showing a regular increase in the reduction peak current value against the increase of scan rate (Fig. 9A).…”

Section: Resultsmentioning

confidence: 99%

In Situ Prussian Blue-Electrocatalyst Formation on Intrinsic Iron-Containing Pristine-MWCNT as a Template and Its EQCM and SECM Interrogations and Batch Injection Analysis of Hydrogen Peroxide

Kumar¹,

Saikrithika²,

Yesudas³

2023

J. Electrochem. Soc.

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Herein, we report in-situ electrochemical derivatization of the intrinsic iron species in a pristine-multiwalled carbon nanotube (MWCNT) as Prussian blue (PB) modified MWCNT hybrid (MWCNT@PB) using a dilute solution of ferricyanide as a derivatization agent in pH 2 HCl-KCl solution. The PB hybrid system showed a defined redox peak at an apparent standard electrode potential, Eo’ = 0.18 V vs Ag/AgCl with an excess surface value, 1.71 ×10-10 mol cm-2. A discreet EQCM study on the electrochemical preparation of MWCNT@PB using MWCNT and ferricyanide precursors reveal the specific stripping of iron species and uptake of iron species, potassium and ferricyanide ions upon the electrochemical preparation condition. In-situ imaging of MWCNT@PB was carried out using SECM with ferricyanide as a redox mediator under a feedback-current mode. It has been identified that a mixed-potential based electrochemical reaction involving oxidative stripping of iron to iron ion species (step-1) coupled with reduction of ferricyanide to ferrocyanide (step-2) followed by a chemical interaction between the iron ion and ferricyanide (step-3) have occurred for the overall formation of MWCNT@PB hybrid. Electrocatalytic and electroanalytical performance of the MWCNT@PB hybrid towards H2O2 reduction and sensing were demonstrated by performing cyclic voltammetric, amperometric i-t and batch injection analysis.

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“…CNT chemically modified electrode preparations.-Functionalized MWCNT (f-MWCNT, where f = functionalized) sample was prepared by treating the pristine MWCNT with concentrated (13 N HNO 3 ) as per the literature procedure. 24 X-ray photoelectron spec-troscopy (Ulvac-PHI, PHI500, Versaprobe) of the f-MWCNT powder sample showed negligible signals at 708.6 eV due to Fe2p 3/2 signal (data not enclosed). At the same time pristine-MWCNT showed marked XPS signal for iron impurity.…”

Section: Methodsmentioning

confidence: 99%

Tetracycline Immobilization as Hydroquinone Derivative at Dissolved Oxygen Reduction Potential on Multiwalled Carbon Nanotube

Kumar

Sundaram

Venkatesan

et al. 2012

J. Electrochem. Soc.

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Upon continuous potential cycling of multiwalled carbon nanotube modified electrode (GCE/MWCNT) with Tetracycline antibiotic (Tet) at −0.5 to 0.4 V vs Ag/AgCl in pH 7 phosphate buffer solution, the Tet drug gets selectively immobilized as Tet-hydroquinone derivative (Tet-HQ) on the GCE/MWCNT (GCE/Tet-HQ@MWCNT) and showed a specific surface confined redox peak at E1/2 =−0.24 ± 0.02 V vs Ag/AgCl. Control potential cycling experiment with o-cresol resulted to similar electrochemical characteristic too. But with p-cresol, no such surface confined redox peak was noticed. Dissolved oxygen reduction to hydrogen peroxide (as an intermediate species) at −0.45 V vs Ag/AgCl and its chemical oxidation of the surface bound Tet@MWCNT to Tet-HQ@MWCNT is proposed as a plausible mechanism. Separate ring-disk screen-printed carbon electrode assembly, where MWCNT and a H2O2 detection catalyst (nano-MnO2) modified on the ring and disk respectively, coupled with flow injection analysis showed specific current signals for oxygen reduction reaction at −0.45 V vs Ag/AgCl on the disk and subsequent H2O2 oxidation on ring at 0.8 V vs Ag/AgCl. The surface confined redox system showed highly selective electrocatalytic reduction signal to hydrogen peroxide at ∼0.22 V vs Ag/AgCl without any interference from the ascorbic acid, uric acid, cysteine and nitrite

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In situ precipitation of Nickel-hexacyanoferrate within multi-walled carbon nanotube modified electrode and its selective hydrazine electrocatalysis in physiological pH

Cited by 49 publications

References 49 publications

Electrodeposited Na₂Ni[Fe(CN)₆] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

Electrodeposited Na₂Ni[Fe(CN)₆] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

In Situ Prussian Blue-Electrocatalyst Formation on Intrinsic Iron-Containing Pristine-MWCNT as a Template and Its EQCM and SECM Interrogations and Batch Injection Analysis of Hydrogen Peroxide

Tetracycline Immobilization as Hydroquinone Derivative at Dissolved Oxygen Reduction Potential on Multiwalled Carbon Nanotube

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In situ precipitation of Nickel-hexacyanoferrate within multi-walled carbon nanotube modified electrode and its selective hydrazine electrocatalysis in physiological pH

Cited by 49 publications

References 49 publications

Electrodeposited Na2Ni[Fe(CN)6] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

Electrodeposited Na2Ni[Fe(CN)6] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

In Situ Prussian Blue-Electrocatalyst Formation on Intrinsic Iron-Containing Pristine-MWCNT as a Template and Its EQCM and SECM Interrogations and Batch Injection Analysis of Hydrogen Peroxide

Tetracycline Immobilization as Hydroquinone Derivative at Dissolved Oxygen Reduction Potential on Multiwalled Carbon Nanotube

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Electrodeposited Na₂Ni[Fe(CN)₆] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions

Electrodeposited Na₂Ni[Fe(CN)₆] Thin-Film Cathodes Exposed to Simulated Aqueous Na-Ion Battery Conditions