Differential pulse voltammetric tuning of the screenprinted carbon electrode surface to enhance the electrochemical performance and multiplex detection

Title : Differential pulse voltammetric tuning of the screenprinted carbon electrode surface to enhance the electrochemical performance and multiplex detection

Abstract:

Screen-Printed Carbon Electrodes (SPCEs) have shown tremendous scope for the miniaturization and commercialization of low-cost electrochemical sensors and biosensor devices. But the commercial SPCEs have a narrow Potential Window (PW) that limits their applications for various analytes owing to the presence of some inherent redox peaks in the wider PW. In this exploration, the electrochemical performance of the SPCE surface has been significantly improved after DPV treatment, making it appropriate for use as a transducer in electrochemical analysis, mainly for the identification of biomolecules. After evaluating the condition of the untreated SPCEs surface, it was pre-cathodized using the DPV technique in KCl-tris buffer (pH = 8) from +2.0 V to -2.0 V vs Ag. The electrochemical performance of the DPV-tuned SPCE electrode was noticeably improved. Because the value of k0 increased from 2.89 x 10 - 6 cm s − 1 at the untuned SPCE to 3.92 x 10-6 cm s − 1 at the tuned SPCE in the presence of a model redox-couple, [Fe(CN)6]-3/-4. The electrochemical double layer Capacitance (Cdl) and the electroactive surface Area (A) of the electrode were enhanced by the factors of 20 and 52 times, respectively, after the DPV treatment. Moreover, the charge transfer resistance (Rct) of the treated SPCE surface decreased about 78 times compared to the fresh electrode. Excellent electrocatalytic performance and reproducibility were displayed by the DPV-tuned electrode towards the redox species [Fe(CN)6]-3/-4 which have been strongly supported by the calculated electrochemical parameters. Furthermore, this DPV treated electrode is greatly suitable to detect multiple analytes (such as Cd2+, Cu2+ and Hg2+) in a mixture with excellent reproducibility. However, this multiplex detection ability of the DPV tuned SPCE has created the opportunity for further research regarding the optimization of signal intensity intended for targeted analytes by the determination of various characteristic electrochemical parameters. Therefore, this study will introduce a reliable innovative platform for not only the pre-treatment of SPCEs but also enhance the electrocatalytic activity, reproducibility, electrode surface area, non-faradaic potential window, eliminating the interfering inherent peak of the electrode surface. It also creates a scope to analyze multiple targets simultaneously within the wide potential window, which may reduce the electroanalysis cost dramatically.

Audience Take Away Notes

• Screen-Printed Carbon Electrodes (SPCEs) demonstrate significant potential for downsizing and commercializing affordable electrochemical sensors and biosensor devices. However, the Potential Window (PW) of commercially available SPCEs is limited, restricting their use for a range of analytes due to inherent redox peaks present in a broader PW. From my presentation, the audiences could be able to learn first time how to eliminate those unexpected redox peaks from the SPCE by electrochemical tunning and apply precisely and successfully
• Here, I will describe an advanced and effective electrochemical method to modify the surface of Screen-Printed Carbon Electrodes (SPCEs) using Differential Pulse Voltammetry (DPV). This modification aimed to eliminate the inherent redox peaks that constrain the Potential Window (PW) of the electrodes. Subsequently, we assessed the electrochemical performance of the modified SPCEs, focusing on various parameters such as reproducibility. This assessment was conducted using Cyclic Voltammetry (CV), DPV, and Electrochemical Impedance Spectroscopy, employing [Fe(CN)6]3−/4− as a model redox analyte. Additionally, we evaluated the modified electrode's capability for detecting multiple analytes by testing it in a mixture containing Cd2+ (cadmium), Cu2+ (copper), and Hg2+ (mercury) ions, using both CV and DPV techniques. The data from the electrochemical analysis reveals that following the DPV-based electrochemical treatment, the surface of the Screen-Printed Carbon Electrode (SPCE) demonstrates outstanding reproducibility and enhanced electrochemical efficiency within an expanded potential window
• I hope that this innovative Differential Pulse Voltammetry (DPV) tuning technique will overcome the intrinsic limitations of Screen-Printed Carbon Electrodes (SPCEs), thereby broadening their potential for accurate applications in diverse fields. The students and colleagues associated with the participants could also enhance their knowledge by having this information shared with them

Biography:

Mohammad Al Mamun completed his B.Sc. (Hons.) in Chemistry in 1999 and M.Sc. in Physical-Inorganic Chemistry in 2001, both from the University of Dhaka, Bangladesh. He further pursued an M.Phil. in Physical Chemistry, which he obtained in 2008, also from the University of Dhaka. Expanding his academic horizons, he went on to earn an MS in Nanoscience and Nanotechnology in 2011 from the University of Rovira I. Virgili (URV), Spain. Since 2011, he has been serving as an Associate Professor of Chemistry at Jagannath University, Dhaka. Currently, he is pursuing his PhD at the NANOCAT (Nanotechnology and Catalysis Research Centre), part of the Institute for Advanced Studies (IAS) at the University of Malaya, Malaysia, under the guidance of Dr. Yasmin Abdul Wahab. Over the course of his career, Al Mamun has contributed significantly to his field with some international awards, authoring over 50 research articles, several book chapters, all published in various international journals.