TY  - CONF
AU  - Varničić, Miroslava
AU  - Sundmacher, Kai
AU  - Vidaković-Koch, Tanja
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6002
AB  - The focus of this research is on rational design of porous enzymatic electrodes as biocatalysts for gluconic acid production.
PB  - Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg
C3  - 2nd Symposium on Insights into Gas Diffusion Electrodes: From Fundamentals to Industrial Applications, 05-07.09.2022, Magdeburg, Germany
T1  - Rational design of 3-D porous enzymatic electrodes for the production of gluconic acid in bioelectrochemical system
SP  - P-32
UR  - https://hdl.handle.net/21.15107/rcub_cer_6002
ER  - 

@conference{
author = "Varničić, Miroslava and Sundmacher, Kai and Vidaković-Koch, Tanja",
year = "2022",
abstract = "The focus of this research is on rational design of porous enzymatic electrodes as biocatalysts for gluconic acid production.",
publisher = "Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg",
journal = "2nd Symposium on Insights into Gas Diffusion Electrodes: From Fundamentals to Industrial Applications, 05-07.09.2022, Magdeburg, Germany",
title = "Rational design of 3-D porous enzymatic electrodes for the production of gluconic acid in bioelectrochemical system",
pages = "P-32",
url = "https://hdl.handle.net/21.15107/rcub_cer_6002"
}

Varničić, M., Sundmacher, K.,& Vidaković-Koch, T.. (2022). Rational design of 3-D porous enzymatic electrodes for the production of gluconic acid in bioelectrochemical system. in 2nd Symposium on Insights into Gas Diffusion Electrodes: From Fundamentals to Industrial Applications, 05-07.09.2022, Magdeburg, Germany
Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg., P-32.
https://hdl.handle.net/21.15107/rcub_cer_6002

Varničić M, Sundmacher K, Vidaković-Koch T. Rational design of 3-D porous enzymatic electrodes for the production of gluconic acid in bioelectrochemical system. in 2nd Symposium on Insights into Gas Diffusion Electrodes: From Fundamentals to Industrial Applications, 05-07.09.2022, Magdeburg, Germany. 2022;:P-32.
https://hdl.handle.net/21.15107/rcub_cer_6002 .

Varničić, Miroslava, Sundmacher, Kai, Vidaković-Koch, Tanja, "Rational design of 3-D porous enzymatic electrodes for the production of gluconic acid in bioelectrochemical system" in 2nd Symposium on Insights into Gas Diffusion Electrodes: From Fundamentals to Industrial Applications, 05-07.09.2022, Magdeburg, Germany (2022):P-32,
https://hdl.handle.net/21.15107/rcub_cer_6002 .

TY  - JOUR
AU  - Varničić, Miroslava
AU  - Zasheva, Iva
AU  - Haak, Edgar
AU  - Sundmacher, Kai
AU  - Vidakovic-Koch, Tanja
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5978
AB  - Electroenzymatic processes are interesting solutions for the development of new processes based on renewable feedstocks, renewable energies, and green catalysts. High-selectivity and sustainability of these processes are usually assumed. In this contribution, these two aspects were studied in more detail. In a membrane-less electroenzymatic reactor, 97% product selectivity at 80% glucose conversion to gluconic acid was determined. With the help of nuclear magnetic resonance spectroscopy, two main side products were identified. The yields of D-arabinose and formic acid can be controlled by the flow rate and the electroenzymatic reactor mode of operation (fuel cell or ion-pumping). The possible pathways for the side product formation have been discussed. The electroenzymatic cathode was found to be responsible for a decrease in selectivity. The choice of the enzymatic catalyst on the cathode side led to 100% selectivity of gluconic acid at somewhat reduced conversion. Furthermore, sustainability of the electroenzymatic process is estimated based on several sustainability indicators. Although some indicators (like Space Time Yield) are favorable for electroenzymatic process, the E-factor of electroenzymatic process has to improve significantly in order to compete with the fermentation process. This can be achieved by an increase of a cycle time and/or enzyme utilization which is currently low.
PB  - MDPI
T2  - Catalysts
T1  - Selectivity and sustainability of electroenzymatic process for glucose conversion to gluconic acid
VL  - 10
IS  - 3
SP  - 269
DO  - 10.3390/catal10030269
ER  - 

@article{
author = "Varničić, Miroslava and Zasheva, Iva and Haak, Edgar and Sundmacher, Kai and Vidakovic-Koch, Tanja",
year = "2020",
abstract = "Electroenzymatic processes are interesting solutions for the development of new processes based on renewable feedstocks, renewable energies, and green catalysts. High-selectivity and sustainability of these processes are usually assumed. In this contribution, these two aspects were studied in more detail. In a membrane-less electroenzymatic reactor, 97% product selectivity at 80% glucose conversion to gluconic acid was determined. With the help of nuclear magnetic resonance spectroscopy, two main side products were identified. The yields of D-arabinose and formic acid can be controlled by the flow rate and the electroenzymatic reactor mode of operation (fuel cell or ion-pumping). The possible pathways for the side product formation have been discussed. The electroenzymatic cathode was found to be responsible for a decrease in selectivity. The choice of the enzymatic catalyst on the cathode side led to 100% selectivity of gluconic acid at somewhat reduced conversion. Furthermore, sustainability of the electroenzymatic process is estimated based on several sustainability indicators. Although some indicators (like Space Time Yield) are favorable for electroenzymatic process, the E-factor of electroenzymatic process has to improve significantly in order to compete with the fermentation process. This can be achieved by an increase of a cycle time and/or enzyme utilization which is currently low.",
publisher = "MDPI",
journal = "Catalysts",
title = "Selectivity and sustainability of electroenzymatic process for glucose conversion to gluconic acid",
volume = "10",
number = "3",
pages = "269",
doi = "10.3390/catal10030269"
}

Varničić, M., Zasheva, I., Haak, E., Sundmacher, K.,& Vidakovic-Koch, T.. (2020). Selectivity and sustainability of electroenzymatic process for glucose conversion to gluconic acid. in Catalysts
MDPI., 10(3), 269.
https://doi.org/10.3390/catal10030269

Varničić M, Zasheva I, Haak E, Sundmacher K, Vidakovic-Koch T. Selectivity and sustainability of electroenzymatic process for glucose conversion to gluconic acid. in Catalysts. 2020;10(3):269.
doi:10.3390/catal10030269 .

Varničić, Miroslava, Zasheva, Iva, Haak, Edgar, Sundmacher, Kai, Vidakovic-Koch, Tanja, "Selectivity and sustainability of electroenzymatic process for glucose conversion to gluconic acid" in Catalysts, 10, no. 3 (2020):269,
https://doi.org/10.3390/catal10030269 . .

TY  - JOUR
AU  - Panić, Vladimir
AU  - Vidakovic-Koch, Tanja R.
AU  - Andric, Milan
AU  - Petkovska, Menka
AU  - Sundmacher, Kai
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/860
AB  - Kinetics of ferrocyanide electrooxidation was investigated by nonlinear frequency response analysis (NLFRA) of current output to the sinusoidal large-amplitude potential perturbation input. The aim was to establish a measurement routine and to validate experimentally the NLFRA method on an example of a simple electrochemical reaction comprising charge and mass transfer. The first-order frequency response function (FRF) contains quasi-linear information on the reaction kinetics and corresponds to electrochemical admittance. The nonlinear fingerprint of the system is contained in the second-order FRF. The first- and second-order FRFs are determined from experimental first and second harmonics. Their intensities depend on the input signal amplitude, which has to be chosen carefully to avoid the contributions of higher order harmonics. The influence of the potential and electrode rotation speed on the first- and second-order FRFs has been studied. The experimentally obtained FRFs are compared with the theoretical FRFs determined in Part I of this work. The theoretical FRFs can predict all essential experimental observations. These findings indicate that additional information on reaction kinetics can be gained from the analysis of the second-order FRF.
PB  - American Chemical Society (ACS)
T2  - Journal of Physical Chemistry C
T1  - Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part II. Measurement Routine and Experimental Validation
VL  - 115
IS  - 35
SP  - 17352
EP  - 17358
DO  - 10.1021/jp201300a
ER  - 

@article{
author = "Panić, Vladimir and Vidakovic-Koch, Tanja R. and Andric, Milan and Petkovska, Menka and Sundmacher, Kai",
year = "2011",
abstract = "Kinetics of ferrocyanide electrooxidation was investigated by nonlinear frequency response analysis (NLFRA) of current output to the sinusoidal large-amplitude potential perturbation input. The aim was to establish a measurement routine and to validate experimentally the NLFRA method on an example of a simple electrochemical reaction comprising charge and mass transfer. The first-order frequency response function (FRF) contains quasi-linear information on the reaction kinetics and corresponds to electrochemical admittance. The nonlinear fingerprint of the system is contained in the second-order FRF. The first- and second-order FRFs are determined from experimental first and second harmonics. Their intensities depend on the input signal amplitude, which has to be chosen carefully to avoid the contributions of higher order harmonics. The influence of the potential and electrode rotation speed on the first- and second-order FRFs has been studied. The experimentally obtained FRFs are compared with the theoretical FRFs determined in Part I of this work. The theoretical FRFs can predict all essential experimental observations. These findings indicate that additional information on reaction kinetics can be gained from the analysis of the second-order FRF.",
publisher = "American Chemical Society (ACS)",
journal = "Journal of Physical Chemistry C",
title = "Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part II. Measurement Routine and Experimental Validation",
volume = "115",
number = "35",
pages = "17352-17358",
doi = "10.1021/jp201300a"
}

Panić, V., Vidakovic-Koch, T. R., Andric, M., Petkovska, M.,& Sundmacher, K.. (2011). Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part II. Measurement Routine and Experimental Validation. in Journal of Physical Chemistry C
American Chemical Society (ACS)., 115(35), 17352-17358.
https://doi.org/10.1021/jp201300a

Panić V, Vidakovic-Koch TR, Andric M, Petkovska M, Sundmacher K. Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part II. Measurement Routine and Experimental Validation. in Journal of Physical Chemistry C. 2011;115(35):17352-17358.
doi:10.1021/jp201300a .

Panić, Vladimir, Vidakovic-Koch, Tanja R., Andric, Milan, Petkovska, Menka, Sundmacher, Kai, "Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part II. Measurement Routine and Experimental Validation" in Journal of Physical Chemistry C, 115, no. 35 (2011):17352-17358,
https://doi.org/10.1021/jp201300a . .

TY  - JOUR
AU  - Vidakovic-Koch, Tanja R.
AU  - Panić, Vladimir
AU  - Andric, Milan
AU  - Petkovska, Menka
AU  - Sundmacher, Kai
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/852
AB  - In this work, a nonlinear frequency response (NLFR) analysis was used for a first time in a theoretical study of nonlinear behavior of electrochemical (EC) ferrocyanide oxidation as a simple model reaction. Analytical expressions of the first- and second-order frequency response functions (FRFs) are derived. The first-order FRF is equivalent to the EC admittance and contains information about the linear behavior of the system, whereas the second-order FRF contains additional nonlinear information. The influence of different parameters, such as the heterogeneous rate constant, solution resistance, double-layer capacitance, diffusion coefficients of the reacting species, and electrode rotation rate on the characteristics of the first- and second-order FRFs was checked and discussed. It was found that the second-order FRF is more sensitive to the changes of the studied parameters than the first-order FRF. Experimental verification of the NLFR analysis of EC ferrocyanide oxidation is presented in Part II of this work
PB  - American Chemical Society (ACS)
T2  - Journal of Physical Chemistry C
T1  - Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part I. A Theoretical Analysis
VL  - 115
IS  - 35
SP  - 17341
EP  - 17351
DO  - 10.1021/jp201297v
ER  - 

@article{
author = "Vidakovic-Koch, Tanja R. and Panić, Vladimir and Andric, Milan and Petkovska, Menka and Sundmacher, Kai",
year = "2011",
abstract = "In this work, a nonlinear frequency response (NLFR) analysis was used for a first time in a theoretical study of nonlinear behavior of electrochemical (EC) ferrocyanide oxidation as a simple model reaction. Analytical expressions of the first- and second-order frequency response functions (FRFs) are derived. The first-order FRF is equivalent to the EC admittance and contains information about the linear behavior of the system, whereas the second-order FRF contains additional nonlinear information. The influence of different parameters, such as the heterogeneous rate constant, solution resistance, double-layer capacitance, diffusion coefficients of the reacting species, and electrode rotation rate on the characteristics of the first- and second-order FRFs was checked and discussed. It was found that the second-order FRF is more sensitive to the changes of the studied parameters than the first-order FRF. Experimental verification of the NLFR analysis of EC ferrocyanide oxidation is presented in Part II of this work",
publisher = "American Chemical Society (ACS)",
journal = "Journal of Physical Chemistry C",
title = "Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part I. A Theoretical Analysis",
volume = "115",
number = "35",
pages = "17341-17351",
doi = "10.1021/jp201297v"
}

Vidakovic-Koch, T. R., Panić, V., Andric, M., Petkovska, M.,& Sundmacher, K.. (2011). Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part I. A Theoretical Analysis. in Journal of Physical Chemistry C
American Chemical Society (ACS)., 115(35), 17341-17351.
https://doi.org/10.1021/jp201297v

Vidakovic-Koch TR, Panić V, Andric M, Petkovska M, Sundmacher K. Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part I. A Theoretical Analysis. in Journal of Physical Chemistry C. 2011;115(35):17341-17351.
doi:10.1021/jp201297v .

Vidakovic-Koch, Tanja R., Panić, Vladimir, Andric, Milan, Petkovska, Menka, Sundmacher, Kai, "Nonlinear Frequency Response Analysis of the Ferrocyanide Oxidation Kinetics. Part I. A Theoretical Analysis" in Journal of Physical Chemistry C, 115, no. 35 (2011):17341-17351,
https://doi.org/10.1021/jp201297v . .

TY  - CONF
AU  - Panić, Vladimir
AU  - Vidaković-Koch, Tanja
AU  - Živković, Luka
AU  - Petkovska, Menka
AU  - Sundmacher, Kai
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3539
AB  - In general, electrochemical (EC) systems are non-linear, which means they respond nonlinearly to a frequency-dependent periodic input perturbation of high amplitude imposed around a steady-state. In addition, the kinetics of EC reactions are quite complex and different rivalling model presentations can be formulated for certain EC reaction. While standard electrochemical methods (steady-state and electrochemical impedance spectroscopy) showed low sensitivity towards the model discrimination, non-linear frequency response analysis (NLFRA) of EC kinetics can appear advantageous for this purpose. In this work, NLFRA is applied in experimental and theoretical study of ferrocyanide oxidation as a model EC reaction.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
T1  - Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics
SP  - 145
EP  - 148
UR  - https://hdl.handle.net/21.15107/rcub_cer_3539
ER  - 

@conference{
author = "Panić, Vladimir and Vidaković-Koch, Tanja and Živković, Luka and Petkovska, Menka and Sundmacher, Kai",
year = "2010",
abstract = "In general, electrochemical (EC) systems are non-linear, which means they respond nonlinearly to a frequency-dependent periodic input perturbation of high amplitude imposed around a steady-state. In addition, the kinetics of EC reactions are quite complex and different rivalling model presentations can be formulated for certain EC reaction. While standard electrochemical methods (steady-state and electrochemical impedance spectroscopy) showed low sensitivity towards the model discrimination, non-linear frequency response analysis (NLFRA) of EC kinetics can appear advantageous for this purpose. In this work, NLFRA is applied in experimental and theoretical study of ferrocyanide oxidation as a model EC reaction.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings",
title = "Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics",
pages = "145-148",
url = "https://hdl.handle.net/21.15107/rcub_cer_3539"
}

Panić, V., Vidaković-Koch, T., Živković, L., Petkovska, M.,& Sundmacher, K.. (2010). Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
Serbian Chemical Society, Belgrade., 145-148.
https://hdl.handle.net/21.15107/rcub_cer_3539

Panić V, Vidaković-Koch T, Živković L, Petkovska M, Sundmacher K. Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:145-148.
https://hdl.handle.net/21.15107/rcub_cer_3539 .

Panić, Vladimir, Vidaković-Koch, Tanja, Živković, Luka, Petkovska, Menka, Sundmacher, Kai, "Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):145-148,
https://hdl.handle.net/21.15107/rcub_cer_3539 .

TY  - CONF
AU  - Panić, Vladimir
AU  - Vidaković-Koch, Tanja
AU  - Živković, Luka
AU  - Petkovska, Menka
AU  - Sundmacher, Kai
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3538
AB  - In general, electrochemical (EC) systems are non-linear, which means they respond nonlinearly to a frequency-dependent periodic input perturbation of high amplitude imposed around a steady-state. In addition, the kinetics of EC reactions are quite complex and different rivalling model presentations can be formulated for certain EC reaction. While standard electrochemical methods (steady-state and electrochemical impedance spectroscopy) showed low sensitivity towards the model discrimination, non-linear frequency response analysis (NLFRA) of EC kinetics can appear advantageous for this purpose. In this work, NLFRA is applied in experimental and theoretical study of ferrocyanide oxidation as a model EC reaction.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics
SP  - 80
EP  - 80
UR  - https://hdl.handle.net/21.15107/rcub_cer_3538
ER  - 

@conference{
author = "Panić, Vladimir and Vidaković-Koch, Tanja and Živković, Luka and Petkovska, Menka and Sundmacher, Kai",
year = "2010",
abstract = "In general, electrochemical (EC) systems are non-linear, which means they respond nonlinearly to a frequency-dependent periodic input perturbation of high amplitude imposed around a steady-state. In addition, the kinetics of EC reactions are quite complex and different rivalling model presentations can be formulated for certain EC reaction. While standard electrochemical methods (steady-state and electrochemical impedance spectroscopy) showed low sensitivity towards the model discrimination, non-linear frequency response analysis (NLFRA) of EC kinetics can appear advantageous for this purpose. In this work, NLFRA is applied in experimental and theoretical study of ferrocyanide oxidation as a model EC reaction.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics",
pages = "80-80",
url = "https://hdl.handle.net/21.15107/rcub_cer_3538"
}

Panić, V., Vidaković-Koch, T., Živković, L., Petkovska, M.,& Sundmacher, K.. (2010). Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Serbian Chemical Society, Belgrade., 80-80.
https://hdl.handle.net/21.15107/rcub_cer_3538

Panić V, Vidaković-Koch T, Živković L, Petkovska M, Sundmacher K. Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2010;:80-80.
https://hdl.handle.net/21.15107/rcub_cer_3538 .

Panić, Vladimir, Vidaković-Koch, Tanja, Živković, Luka, Petkovska, Menka, Sundmacher, Kai, "Non-linear frequency response analysis of the kinetics of electrochemical reactions: a case study – ferrocyanide oxidation kinetics" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2010):80-80,
https://hdl.handle.net/21.15107/rcub_cer_3538 .