Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)

Next-generation devices that are sensitive with stimulus-responsive properties is a highly desired goal in monitoring and diagnostics technology field. Nanomaterial has been extensively used in transducer development for sensor applications. However, sensor devices possess huge challenges in exhibit...

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Main Authors:	Shohibuddin, Ihda Uswatun Shalihah, Wan Salim, Wan Wardatul Amani
Format:	Conference or Workshop Item
Language:	English English
Published:	2019
Subjects:	RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry RC71 Examination. Diagnosis TP248.13 Biotechnology
Online Access:	http://irep.iium.edu.my/77685/ http://irep.iium.edu.my/77685/1/KRD%20Poster%20Uswah%20et%20al.pdf http://irep.iium.edu.my/77685/13/77685%20abstract.pdf

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recordtype	eprints
spelling	iium-776852020-02-06T04:08:56Z http://irep.iium.edu.my/77685/ Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress) Shohibuddin, Ihda Uswatun Shalihah Wan Salim, Wan Wardatul Amani RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry RC71 Examination. Diagnosis TP248.13 Biotechnology Next-generation devices that are sensitive with stimulus-responsive properties is a highly desired goal in monitoring and diagnostics technology field. Nanomaterial has been extensively used in transducer development for sensor applications. However, sensor devices possess huge challenges in exhibiting sensitive responses with fast electron transfer. Little studies have been made to understand the thermodynamics and kinetics of electron transfer at electrode-analyte interface. Therefore in our project, we have utilized intrinsic property of reduced graphene oxide:polystyrenesulfonate (rGO:PSS) as transducer of a sensor. Reduced graphene oxide (rGO), poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS), and rGO:PSS were casted onto the active sensing area of glassy carbon electrode (GCE). The developed electrodes were electrochemically characterized by cyclic voltammetry (CV) measurement at varying scan rates (75, 100, 150, 200, 250) mV/s. The CV graphs elucidated the thermodynamics and kinetics of electron transfer between potassium ferricyanide (K3FeCN6) electrolyte and rGO:PSS modified electrode by analyzing the shifts in peak potentials, Ep. The peak potentials of resultant electrodes revealed a shift of 120 mV for rGO modified electrode, which decreased to 90 mV when the electrode was modified with PEDOT:PSS, and further decreased to 30 mV when rGO:PSS was casted onto the GCE. The smaller shift in rGO:PSS electrode suggests that the kinetics or the rate of electron transfer at electrode-analyte interface was very fast and rapid, indicating strong electronic coupling between electrode and electrolyte; the electron transfer was reversible. The thermodynamics of redox process happened easily which deals with the transformation of energy between the rGO:PSS modified electrode and the ferricyanide electroactive species in electrolyte. Additionally, the peak potential difference (∆E = Epa – Epc) was also analyzed. The ∆Es were 0.42 V, 0.30 V, and 0.12 V for GCE/rGO, GCE/PEDOT:PSS, and GCE/rGO:PSS, respectively. The lower ∆E for GCE/rGO:PSS implied an improved electrocatalytic ability of the developed electrode. As for the accuracy of the CV analysis, the adsorption from electrolyte to electrode was investigated by plotting peak currents against square root of scan rates. The linear fit for all CV measurements; R¬2 = 0.999, 0.940, 0.930, and 0.999 for GCE, GCE/rGO, GCE/PEDOT:PSS, and GCE/rGO:PSS, respectively, revealed that no adsorption occurred during the redox process. Besides, the lowest scan rate was set as 75 mV/s in order to avoid convection of electroactive species into the diffusion layer. Therefore, the CV analysis was based solely on electron transfer, and not on adsorption and convection, which would otherwise interfere the CV analysis. As a conclusion, rGO:PSS nanomaterial has a prevalent potential as a transducer and ultimately improve the sensor performance in monitoring technology field. 2019 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/77685/1/KRD%20Poster%20Uswah%20et%20al.pdf application/pdf en http://irep.iium.edu.my/77685/13/77685%20abstract.pdf Shohibuddin, Ihda Uswatun Shalihah and Wan Salim, Wan Wardatul Amani (2019) Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress). In: IIUM Kuantan Research Day 2019, 19th October 2019, Kuantan, Pahang. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry RC71 Examination. Diagnosis TP248.13 Biotechnology
spellingShingle	RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry RC71 Examination. Diagnosis TP248.13 Biotechnology Shohibuddin, Ihda Uswatun Shalihah Wan Salim, Wan Wardatul Amani Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
description	Next-generation devices that are sensitive with stimulus-responsive properties is a highly desired goal in monitoring and diagnostics technology field. Nanomaterial has been extensively used in transducer development for sensor applications. However, sensor devices possess huge challenges in exhibiting sensitive responses with fast electron transfer. Little studies have been made to understand the thermodynamics and kinetics of electron transfer at electrode-analyte interface. Therefore in our project, we have utilized intrinsic property of reduced graphene oxide:polystyrenesulfonate (rGO:PSS) as transducer of a sensor. Reduced graphene oxide (rGO), poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS), and rGO:PSS were casted onto the active sensing area of glassy carbon electrode (GCE). The developed electrodes were electrochemically characterized by cyclic voltammetry (CV) measurement at varying scan rates (75, 100, 150, 200, 250) mV/s. The CV graphs elucidated the thermodynamics and kinetics of electron transfer between potassium ferricyanide (K3FeCN6) electrolyte and rGO:PSS modified electrode by analyzing the shifts in peak potentials, Ep. The peak potentials of resultant electrodes revealed a shift of 120 mV for rGO modified electrode, which decreased to 90 mV when the electrode was modified with PEDOT:PSS, and further decreased to 30 mV when rGO:PSS was casted onto the GCE. The smaller shift in rGO:PSS electrode suggests that the kinetics or the rate of electron transfer at electrode-analyte interface was very fast and rapid, indicating strong electronic coupling between electrode and electrolyte; the electron transfer was reversible. The thermodynamics of redox process happened easily which deals with the transformation of energy between the rGO:PSS modified electrode and the ferricyanide electroactive species in electrolyte. Additionally, the peak potential difference (∆E = Epa – Epc) was also analyzed. The ∆Es were 0.42 V, 0.30 V, and 0.12 V for GCE/rGO, GCE/PEDOT:PSS, and GCE/rGO:PSS, respectively. The lower ∆E for GCE/rGO:PSS implied an improved electrocatalytic ability of the developed electrode. As for the accuracy of the CV analysis, the adsorption from electrolyte to electrode was investigated by plotting peak currents against square root of scan rates. The linear fit for all CV measurements; R¬2 = 0.999, 0.940, 0.930, and 0.999 for GCE, GCE/rGO, GCE/PEDOT:PSS, and GCE/rGO:PSS, respectively, revealed that no adsorption occurred during the redox process. Besides, the lowest scan rate was set as 75 mV/s in order to avoid convection of electroactive species into the diffusion layer. Therefore, the CV analysis was based solely on electron transfer, and not on adsorption and convection, which would otherwise interfere the CV analysis. As a conclusion, rGO:PSS nanomaterial has a prevalent potential as a transducer and ultimately improve the sensor performance in monitoring technology field.
format	Conference or Workshop Item
author	Shohibuddin, Ihda Uswatun Shalihah Wan Salim, Wan Wardatul Amani
author_facet	Shohibuddin, Ihda Uswatun Shalihah Wan Salim, Wan Wardatul Amani
author_sort	Shohibuddin, Ihda Uswatun Shalihah
title	Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
title_short	Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
title_full	Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
title_fullStr	Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
title_full_unstemmed	Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
title_sort	thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)
publishDate	2019
url	http://irep.iium.edu.my/77685/ http://irep.iium.edu.my/77685/1/KRD%20Poster%20Uswah%20et%20al.pdf http://irep.iium.edu.my/77685/13/77685%20abstract.pdf
first_indexed	2023-09-18T21:49:35Z
last_indexed	2023-09-18T21:49:35Z
_version_	1777413679032041472

Thermodynamics and kinetics of electron transfer between electrolyte and nanocomposite modified electrode for sensor application (work in progress)

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