Mesoporous cobalto-cobaltic oxide modified glassy carbon electrode for simultaneous detection of hydroquinone and catechol

Cui, Shiqiang; Li, Li; Ding, Yaping; Zhang, Jiangjiang

doi:10.1016/j.jelechem.2016.10.007

Cited by 39 publications

(10 citation statements)

References 62 publications

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“…As compared with the Nernst equation E = E 0 − (0.059/ n ) × pH, the slope of the linear regression equation is quite near the theoretical value of −0.059, which indicates that the numbers of protons and electron involved in the irreversible electrochemical reduction are the same. According to these results, pH 0.16 (the corresponding H 2 SO 4 concentration is 1 mol L −1 ) was determined as the optimal pH condition and was used in the further related experiments.…”

Section: Resultsmentioning

confidence: 69%

Multifunctional electrochemical application of a novel 3D AgInS₂/rGO nanohybrid for electrochemical detection and HER

Shi

Chen

Bai

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Environmental pollution and energy depletion are two serious problems that face mankind at present, so it is urgent to develop effective methods to deal with them. Electrochemistry offers a promising solution method owing to its fast, sensitive and clean properties. Since electrode materials are significantly important to improve electrochemical performance, studies of effective electrode materials have attracted increasing interest and become a research hotspot in recent years. RESULTS:In this study, a novel multitasking electrode material 3D AgInS 2 /rGO was successfully prepared, the first to couple two important electrochemical functions of sensing and hydrogen evolution reaction (HER) into one electrode material. It can highly sensitively detect 4-nitrophenol in real water over a wide concentration range with significantly low limit of detection, outstanding stability and anti-interference ability. Furthermore, it can effectively electrolyze water to produce H 2 by HER with low onset potential, low overpotential, small Tafel slope, good durability and high stability.CONCLUSION: The study indicates that the highly conductive 3D rGO scaffold decorated with nano AgInS 2 particles forms a nanohybrid, which produces positive synergistic effects to improve the electrochemical properties. This 3D AgInS 2 /rGO nanocomposite is considered to have high potential to deal with environmental problems owing to its high performance in the two important functions of contaminant sensing and HER. Preparation of AgInS 2 /rGO/GCEThe GCE (3 mm diameter) was polished with 0.3 μm Al 2 O 3 powder and then sonicated in mixtures of nitric acid/water (1:1, v:v) and ethanol/water (1:1, v:v) for 5 min respectively. After that, the electrode was dried in air. As-prepared AgInS 2 /rGO was dispersed in water to get a 1 mg mL −1 dispersion; 12 μL of this AgInS 2 /rGO dispersion was dropped on the surface of the pre-cleaned GCE and then dried to obtain the AgInS 2 /rGO-modified GCE (denoted as AgInS 2 /rGO/GCE). Preparation of AgInS 2 /rGO/NFIn the HER experiment, nickel foam (NF) (1 cm × 2 cm) was sequentially sonicated in hydrochloric acid, ethanol and deionized water wileyonlinelibrary.com/jctb

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Section: Resultsmentioning

confidence: 69%

Multifunctional electrochemical application of a novel 3D AgInS₂/rGO nanohybrid for electrochemical detection and HER

Shi

Chen

Bai

et al. 2019

J of Chemical Tech & Biotech

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“…4C; thus, we can suggest that this molecule was converted to quinone by the release of two protons that were involved in the redox reaction. 21,42 The Miller and Miller statistical method 44,45 was used to calculate theLOD and the LOQ, which showed values equals to 1.85 × 10 -6 mol l −1 and 6.18 × 10 -7 mol l −1 , respectively.…”

Section: X-ray Diffraction (Xrd)-figurementioning

confidence: 99%

“…Conventional methods such as chromatography, mass spectrometry and chemiluminescence [21][22][23] are widely used to detect polluting analytes, such as catechol. However, these methods require expensive equipment, highly skilled labor, generally generate solvent residues and have an extensive analysis time.…”

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confidence: 99%

Thermoplastic Starch and Graphite Biocomposite Electrode for Electrochemical Catechol Sensor

et al. 2022

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There is interest in obtaining alternative materials for application in electrochemical sensing. Thermoplastic starch (TPS) was used because it is a polymer with high availability and biodegradability, which can be incorporated into graphite (Gr) forming a conductive material. This work describes the characterization of the material produced by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), contact angle, x-ray diffraction (XRD) and Raman spectroscopy. The techniques used allowed to show a good interaction between graphite and TPS and confirmed the predicted conductive properties, showing the potential of application as a substrate, in the development of electrochemical sensors. Electrochemical characterization by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) was also carried out, which allowed defining the best proportion of graphite:TPS as the composite of 60:40 w/w. The technique of differential pulse voltammetry (DPV) was used to determine the catechol molecule over a range of 0.1 to 2.0 mmol L-1, showing a linear regression (R2) of 0.9996 and limit of detection (LOD) and limit of quantitation (LOQ) values equal to 1.85×10-6 mol L-1 and 6.18×10-7 mol L-1, respectively. The results showed good precision, selectivity, and stability, proving the application as an electrochemical sensor to detect catechol (CC) in contaminated water.

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“…However, these analytical methods often suffer from some disadvantages including the expensive instruments and the sample pretreatment. Special attention has been paid on electrochemical methods [13][14][15][16][17][18][19][20][21][22][23][24] due to their advantages of fast response, high sensitivity, point-of-care detection, simple equipment and low cost. In the past few years, some materials had been investigated to fabricate different chemically modified electrodes for achieving simultaneous determination of CC and HQ.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Catechol and Hydroquinone on Nano‐Co/L‐Cysteine Modified Glassy Carbon Electrode

et al. 2021

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In this study, a novel and highly sensitive electrochemical method for simultaneous determination of catechol (CC) and hydroquinone (HQ) was developed, which worked at GCE modified with Nano cobalt (Nano-Co) by electrodeposition and L-Cysteine by electrochemical polymerization. The Nano-Co/L-Cysteine GCE was investigated by cyclic voltammetry (CV), SEM and EIS. The excellent conditions have been selected including supporting electrolyte, pH, accumulation time and scan rate. The calibration curves of were obtained that the linear regression equation was I = 0.0734c + 6 × 10 À 6 in the range of 5.8 μM to 103 μM (R 2 = 0.9942) for CC and the linear regression equation was I = 0.0566c + 5 × 10 À 6 in the range of 5.8 μM to 100 μM (R 2 = 0.9967) for HQ. The obtained detection limits of CC and HQ both were 6 × 10 À 7 M. The modified electrode was successfully applied to the simultaneous determination of CC and HQ in water samples.

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Mesoporous cobalto-cobaltic oxide modified glassy carbon electrode for simultaneous detection of hydroquinone and catechol

Cited by 39 publications

References 62 publications

Multifunctional electrochemical application of a novel 3D AgInS₂/rGO nanohybrid for electrochemical detection and HER

Multifunctional electrochemical application of a novel 3D AgInS₂/rGO nanohybrid for electrochemical detection and HER

Thermoplastic Starch and Graphite Biocomposite Electrode for Electrochemical Catechol Sensor

Simultaneous Determination of Catechol and Hydroquinone on Nano‐Co/L‐Cysteine Modified Glassy Carbon Electrode

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Mesoporous cobalto-cobaltic oxide modified glassy carbon electrode for simultaneous detection of hydroquinone and catechol

Cited by 39 publications

References 62 publications

Multifunctional electrochemical application of a novel 3D AgInS2/rGO nanohybrid for electrochemical detection and HER

Multifunctional electrochemical application of a novel 3D AgInS2/rGO nanohybrid for electrochemical detection and HER

Thermoplastic Starch and Graphite Biocomposite Electrode for Electrochemical Catechol Sensor

Simultaneous Determination of Catechol and Hydroquinone on Nano‐Co/L‐Cysteine Modified Glassy Carbon Electrode

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Multifunctional electrochemical application of a novel 3D AgInS₂/rGO nanohybrid for electrochemical detection and HER

Multifunctional electrochemical application of a novel 3D AgInS₂/rGO nanohybrid for electrochemical detection and HER