TY - JOUR
T1 - Anthraquinone Functionalized Ionic Liquid Based Disposable Electrochemical Sensor for the Enzyme-Free Detection of Hydrogen Peroxide
AU - Manusha, Prathapaneni
AU - Theyagarajan, K.
AU - Elancheziyan, Mari
AU - Shankar, Harisingh
AU - Thenmozhi, Kathavarayan
AU - Senthilkumar, Sellappan
N1 - Publisher Copyright:
© 2022 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - A simple and selective enzyme-free electrochemical sensor for H2O2 has been designed and fabricated using ionic liquid (IL) tagged anthraquinone (AQ) modified electrode (AQ-PF6-IL). This newly synthesized AQ-PF6-IL has been systematically characterized, after which it has been immobilized over a screen-printed electrode to produce AQ-PF6-IL/SPE. The electrochemical investigation of AQ-PF6-IL/SPE displayed a set of distinct redox peaks attributable to the anthraquinone/anthrahydroquinone redox pair. Interestingly, AQ-PF6-IL/SPE has shown enhanced peak current at reduced formal potential for AQ, when compared to AQ/SPE. Further, the electrocatalytic activity of AQ-PF6-IL/SPE towards the reduction of H2O2 was investigated with the sequential addition of H2O2. A rapid and appreciable enhancement in cathodic peak currents was observed and thus demonstrating the excellent electrochemical reduction of H2O2 at the newly developed sensor. Besides, AQ-PF6-IL/SPE established a good linear behaviour over a concentration range of 10-1228 μM with a high sensitivity of 0.281 μA μM−1 cm−2 and low detection limit of 2.87 μM. The fabricated sensor displayed excellent stability, good anti-interference ability, along with acceptable reproducibility. The superior properties of the developed sensor could be attributed to the newly designed AQ-PF6-IL, wherein the redox characteristics of AQ mediator are integrated with the high stability and conductivity of IL.
AB - A simple and selective enzyme-free electrochemical sensor for H2O2 has been designed and fabricated using ionic liquid (IL) tagged anthraquinone (AQ) modified electrode (AQ-PF6-IL). This newly synthesized AQ-PF6-IL has been systematically characterized, after which it has been immobilized over a screen-printed electrode to produce AQ-PF6-IL/SPE. The electrochemical investigation of AQ-PF6-IL/SPE displayed a set of distinct redox peaks attributable to the anthraquinone/anthrahydroquinone redox pair. Interestingly, AQ-PF6-IL/SPE has shown enhanced peak current at reduced formal potential for AQ, when compared to AQ/SPE. Further, the electrocatalytic activity of AQ-PF6-IL/SPE towards the reduction of H2O2 was investigated with the sequential addition of H2O2. A rapid and appreciable enhancement in cathodic peak currents was observed and thus demonstrating the excellent electrochemical reduction of H2O2 at the newly developed sensor. Besides, AQ-PF6-IL/SPE established a good linear behaviour over a concentration range of 10-1228 μM with a high sensitivity of 0.281 μA μM−1 cm−2 and low detection limit of 2.87 μM. The fabricated sensor displayed excellent stability, good anti-interference ability, along with acceptable reproducibility. The superior properties of the developed sensor could be attributed to the newly designed AQ-PF6-IL, wherein the redox characteristics of AQ mediator are integrated with the high stability and conductivity of IL.
KW - anthraquinone
KW - electrochemical sensor
KW - hydrogen peroxide
KW - ionic liquid
KW - redox mediator
UR - https://www.scopus.com/pages/publications/85139673960
U2 - 10.1149/2754-2726/ac82bd
DO - 10.1149/2754-2726/ac82bd
M3 - Article
AN - SCOPUS:85139673960
SN - 2754-2726
VL - 1
JO - ECS Sensors Plus
JF - ECS Sensors Plus
IS - 3
M1 - 033601
ER -