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( Perumal Silambarasan ),( G. Muthuraman ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Instead of only electrolyte in one half-cell in detection gas sensors, addition of mediator precursor can be an added advantageous to reduce the over potential. In the present investigation, 0.1 M CoSO<sub>4</sub> in 5 M H<sub>2</sub>SO<sub>4</sub> or 0.05 M [Ni(CN)<sub>4</sub>]<sup>2-</sup> in 10 M KOH as electrolyte in one half-cell were used with Ag-Ni or Ag-Co metal ions coated Nafion324 membrane electrode divided cell for detection of air pollutants. Based on the cyclic voltammetry and linear sweep voltammetry analyses with and without CoSO<sub>4</sub> and [Ni(CN)<sub>4</sub>]<sup>2-</sup>, the gas phase redox peak was fixed for detection of selected gas pollutants. Then sense a selected air pollutants by amperometric method at different suitable applied voltage. The current with different feed concentration were compared with in-situ FTIR gas analyzer concentration and derived calibration plot.
( Perumal Silambarasan ),( G. Muthuraman ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In the present investigation, Ag and Ag-Ni or Ag-Co metal ions coated Nafioni324 membrane electrode divided cell was developed and compared in amperometric detection of air pollutants. Ag and Ag-Ni or Ag-Co were chemically coated on the Nafion324 membrane and used in filter press technique to make a cell with one side having 0.1 M KOH electrolyte and gas phase cathodic half-cell. Based on the cyclic voltammetry and linear sweep voltammetry analyses, the gas phase redox peak was fixed for detection of selected gas pollutants. Then sense a selected air pollutants by amperometric method at different suitable applied voltage. The current with different feed concentration were compared with in-situ FTIR gas analyzer concentration and derived calibration plot.
( Perumal Silambarasan ),심왕근,( G. Muthuraman ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In the rotating disc electrode transient current, the bulk concentration considered as constant due to the non-electrolyzed solution. But, change in bulk concentration occurred in many paired electrolysis process with electrolysis time that is used for many applications. In this work, the transient current and concentration change in the rotating disc electrode (RDE) system is explained by solving the convection and diffusion equation for a quasi- reversible electron transfer. The mathematical models are solved by applying orthogonal collocation method. This approach enables us the current response and concentration change with electrolysis time. Experimental results compared with the theoretically simulated data. A good correlation found between the current and the RDE system. The possible expression derived in the present work for bulk concentration change can be used for continuous electrolysis system.
( Perumal Silambarasan ),( Govindan Muthuraman ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Very recently, an in-situ determination of electron mediators’ quantification was developed by potentiometric sensor method. Here in, a rationalization of potentiometric sensor by RDE (rotating disc electrode) and flow cell methods were optimized. First, electrochemical generation of [Co(I)(CN)5]4- in 10 M KOH solution was done by Nafion324 membrane divided electrochemical cell. The electrogenerated solution monitored by current and potential using RDE and flow cell with different RPM (rotation per minute) and flow rate by cyclic voltammetry (CV) method. By comparing the peak potential and peak current change, validation of a suitable method was derived for potentiometric sensor in determination of electrogenerated electron mediator in solution.
( Perumal Silambarasan ),( G. Muthuraman ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Our recent publication unfolded an in-line determination of homogeneous electron mediator but, validation by a standard hydrodynamic method is still deserved. In the present investigation, a comparative analysis by RDE (rotating disc electrode) and flow cell methods were optimized in development of on-line potentiometric sensor for homogeneous electron mediator generation. First, [Co(I)(CN)<sub>5</sub>]<sup>4-</sup> (Co(I)) was electrochemically generated in 10 M KOH solution by Nafion324 membrane divided electrochemical cell. The electrogenerated solution monitored by current and potential using RDE and flow cell with different RPM (rotation per minute) and flow rate by cyclic voltammetry (CV) method. By comparing the peak potential and peak current change, validation of a suitable method was derived for potentiometric sensor in determination of homogeneous electrogenerated electron mediator.
( Perumal Silambarasan ),( G. Muthuraman ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Instead of off-line potentiometric titrations for electron mediator’s quantification, in-situ determination can be an accurate method. Here in, we have initiated to monitor the electrochemically prepared mediator [Co(I)(CN)<sub>5</sub>]<sup>4-</sup> by in-situ flow sensor cell coupled with paired electrolysis cell. First, cyclic voltammetry peak current for a standard redox couple Fe(II)/Fe(III) with different concentration ratios was used in the flow sensor cell to check the developed method. Then the Chemically prepared [Co(I)(CN)<sub>5</sub>]<sup>4-</sup> in presence of 10 M KOH at different concentrations were analyzed by UV-Visible and potentiometric titration method and compared. Finally, the chemically prepared different concentration of Co(I) do monitored using selected electrode under the inert atmosphere by flow sensor cell. The resulted calibration plot used to derive the concentration of [Co(I)(CN)<sub>5</sub>]<sup>4-</sup>.
( Perumal Silambarasan ),문일식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
To overcome the off-line potentiometric titrations for electron mediator’s quantification, in-situ determination has been attempted. Here in, we have initiated to monitor the electrochemically prepared mediator [Co(I)(CN)5]4- by in-situ flow sensor cell coupled with paired electrolysis cell. First, cyclic voltammetry peak current for a standard redox couple Fe(II)/Fe(III) with different concentration ratios was used in the flow sensor cell to check the developed method. Then the Chemically prepared [Co(I)(CN)5]4- in presence of 10 M KOH at different concentrations were analyzed by UV-Visible and potentiometric titration method and compared. Finally, the chemically prepared different concentration of Co(I) do monitored using selected electrode under the inert atmosphere by flow sensor cell. The concentration of [Co(I)(CN)5]4- was derived from the calibration plot.