Abstract
Under the main features required on portable devices in electrochemical instrumentation is to have a small size, low power consumption, economically affordable and precision in the measurements. This paper describes the development of a programmable Embedded Potentiostat System (EPS) capable of performing electrochemical sensing over system-on-a-chip platforms. Furthermore, the study explains a circuit design and develops some validation of the entire system. The hardware validation is performed by electrochemical experiments such as Double Step Chronoamperometry (DSC), Linear Sweep Voltammetry (LSV) and Cyclic Voltammetry (CV); moreover, a comparison of the experimental signals between a commercial potentiostat and the EPS was done by analysis of errors on the response signal. Results illustrate that the EPS is capable of handling currents in the range of absolute values of 86.44 to 3000 nA and having control voltages in the range of ±2 V. The device can support from 50 to 2000 samples per second. The EPS capabilities were compared with other compact potentiostats. The programmable EPS is an original approach which hugely reduces the hardware complexity and leads the way to create new applications for Point-of-Care or industrial developments with a reusable full electronics module.
Highlights
A potentiostat is a device which can input predetermined voltage/current signals that generate outputs with an electron-related behavior needed to study redox reactions [1]
Before comparing the commercial potentiostat with the Embedded Potentiostat System (EPS), the WE were cleaned by immerse it in 0.1 M of HNO3 (Sigma Aldrich) for approximately 10 min, later the WE was rinsing with distilled water; after that, the WE received an electrochemical pretreatment to activate its surface by running a sequence of different scan rates of Cyclic Voltammetry (CV) and by using 0.1 M of HCl (Sigma Aldrich); The CV sequences of the activation surface is shown on Table 1
In the process of surface activation, all CVs were done on the windows of scan potentials of (−0.15 to 0.65) V versus Ag/AgCl where the initial voltage was set at 0.25 V versus Ag/AgCl
Summary
A potentiostat is a device which can input predetermined voltage/current signals that generate outputs with an electron-related behavior needed to study redox reactions [1]. It is presented in the study a had proposed a highly customizable and flexible platform consisting of the electronic well-description characterization on the potentiostat system, it is necessary fora making circuits and theand software to drive redox reactions It iswhich presented in the study wellpossible the availability of technological devices [8,10,11,12,13,14]. The scalability of the system takes place using pattern designs at the software level It is presented in this work a flexible and integral methodology that includes the characterization and calibration of the potentiostat, the electronics of the device were tested by performing three electrochemical techniques and its analysis of errors. This methodology allows for the reconfiguration of the device to execute different electrochemical techniques allowing a correct functioning of the equipment
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