Electrochemical studies of the nickel catecholate complexes for detection of sulphur dioxide gas

Inonge Tembwe; J. Catherine Ngila; Boitumelo Kgarebe; James Darkwa; Emmanuel Iwuoha

doi:10.1016/j.electacta.2009.06.081

Electrochemical studies of the nickel catecholate complexes for detection of sulphur dioxide gas

Inonge Tembwe, J. Catherine Ngila, Boitumelo Kgarebe, James Darkwa, Emmanuel Iwuoha

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Nickel catecholate complexes, bis(diphenylphosphino)ethanenickelcatecholate [(dppe)NiO₂C₆H₃4-R₁] R₁ = CH₃ (1), C(CH₃)₃ (2), H (3) and F (4)] were studied using CV and SWV techniques between -1.5 and +1.5 V at 50 mV s^-1 in cathodic and anodic sweeps. Glassy carbon electrode was used with 0.1 M tetrabutylammonium tetrafluroborate (TBATFB) in CH₂Cl₂. Complexes 1-4 before addition of SO₂, showed approximately reversible behaviour (i_pa/i_pc ≈ 1 and ΔE ≈ 77-88 mV); oxidation peaks observed between +313 and +524 mV, reduction peaks between +225 and +436 mV, depending on the substituent on the ligand. Detection limit 0.01 ppm, linear range 0.01-20 ppm, sensitivity 0.02 ppm/mV (with SWV) were obtained. The complexes 1 and 2 could be used as voltammetric sensors while complexes 3 and 4 would be suitable as amperometric sensors, for monitoring industrial SO₂ emissions.

Original language	English
Pages (from-to)	4314-4318
Number of pages	5
Journal	Electrochimica Acta
Volume	55
Issue number	14
DOIs	https://doi.org/10.1016/j.electacta.2009.06.081
Publication status	Published - 30 May 2010

Keywords

Gas sensors
Nickel catecholates
Square wave voltammetry
Sulphur dioxide

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.electacta.2009.06.081

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title = "Electrochemical studies of the nickel catecholate complexes for detection of sulphur dioxide gas",

abstract = "Nickel catecholate complexes, bis(diphenylphosphino)ethanenickelcatecholate [(dppe)NiO2C6H34-R1] R1 = CH3 (1), C(CH3)3 (2), H (3) and F (4)] were studied using CV and SWV techniques between -1.5 and +1.5 V at 50 mV s-1 in cathodic and anodic sweeps. Glassy carbon electrode was used with 0.1 M tetrabutylammonium tetrafluroborate (TBATFB) in CH2Cl2. Complexes 1-4 before addition of SO2, showed approximately reversible behaviour (ipa/ipc ≈ 1 and ΔE ≈ 77-88 mV); oxidation peaks observed between +313 and +524 mV, reduction peaks between +225 and +436 mV, depending on the substituent on the ligand. Detection limit 0.01 ppm, linear range 0.01-20 ppm, sensitivity 0.02 ppm/mV (with SWV) were obtained. The complexes 1 and 2 could be used as voltammetric sensors while complexes 3 and 4 would be suitable as amperometric sensors, for monitoring industrial SO2 emissions.",

keywords = "Gas sensors, Nickel catecholates, Square wave voltammetry, Sulphur dioxide",

author = "Inonge Tembwe and Ngila, {J. Catherine} and Boitumelo Kgarebe and James Darkwa and Emmanuel Iwuoha",

year = "2010",

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doi = "10.1016/j.electacta.2009.06.081",

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T1 - Electrochemical studies of the nickel catecholate complexes for detection of sulphur dioxide gas

AU - Tembwe, Inonge

AU - Ngila, J. Catherine

AU - Kgarebe, Boitumelo

AU - Darkwa, James

AU - Iwuoha, Emmanuel

PY - 2010/5/30

Y1 - 2010/5/30

N2 - Nickel catecholate complexes, bis(diphenylphosphino)ethanenickelcatecholate [(dppe)NiO2C6H34-R1] R1 = CH3 (1), C(CH3)3 (2), H (3) and F (4)] were studied using CV and SWV techniques between -1.5 and +1.5 V at 50 mV s-1 in cathodic and anodic sweeps. Glassy carbon electrode was used with 0.1 M tetrabutylammonium tetrafluroborate (TBATFB) in CH2Cl2. Complexes 1-4 before addition of SO2, showed approximately reversible behaviour (ipa/ipc ≈ 1 and ΔE ≈ 77-88 mV); oxidation peaks observed between +313 and +524 mV, reduction peaks between +225 and +436 mV, depending on the substituent on the ligand. Detection limit 0.01 ppm, linear range 0.01-20 ppm, sensitivity 0.02 ppm/mV (with SWV) were obtained. The complexes 1 and 2 could be used as voltammetric sensors while complexes 3 and 4 would be suitable as amperometric sensors, for monitoring industrial SO2 emissions.

AB - Nickel catecholate complexes, bis(diphenylphosphino)ethanenickelcatecholate [(dppe)NiO2C6H34-R1] R1 = CH3 (1), C(CH3)3 (2), H (3) and F (4)] were studied using CV and SWV techniques between -1.5 and +1.5 V at 50 mV s-1 in cathodic and anodic sweeps. Glassy carbon electrode was used with 0.1 M tetrabutylammonium tetrafluroborate (TBATFB) in CH2Cl2. Complexes 1-4 before addition of SO2, showed approximately reversible behaviour (ipa/ipc ≈ 1 and ΔE ≈ 77-88 mV); oxidation peaks observed between +313 and +524 mV, reduction peaks between +225 and +436 mV, depending on the substituent on the ligand. Detection limit 0.01 ppm, linear range 0.01-20 ppm, sensitivity 0.02 ppm/mV (with SWV) were obtained. The complexes 1 and 2 could be used as voltammetric sensors while complexes 3 and 4 would be suitable as amperometric sensors, for monitoring industrial SO2 emissions.

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KW - Nickel catecholates

KW - Square wave voltammetry

KW - Sulphur dioxide

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Electrochemical studies of the nickel catecholate complexes for detection of sulphur dioxide gas

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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