Development of an interactive, low-cost electrochemical sensor kit to teach redox chemistry and analytical techniques in high-school and undergraduate labs.

Project Abstract

This study presents the design, development, and evaluation of an interactive, low-cost electrochemical sensor kit aimed at teaching redox chemistry and analytical techniques to high-school and undergraduate laboratory students. The kit integrates a modular electrochemical workstation, screen-printed electrodes, a USB-powered microcontroller, and a set of interchangeable redox-active probe solutions to demonstrate common electrochemical techniques such as cyclic voltammetry, differential pulse voltammetry, chronoamperometry, and impedance spectroscopy. The pedagogical framework combines inquiry-based learning with guided experiments to enhance conceptual understanding of electrochemical principles, data interpretation, and laboratory safety. The hardware is designed with affordability and accessibility in mind, using readily available components and open-source software to facilitate customization by educators and students. The software suite provides a user-friendly interface for instrument control, real-time data visualization, and automated analysis, including peak identification, calibration curves, and error analysis, while enabling students to explore parameter effects such as scan rate, electrode surface modification, solution conductivity, and pH on electrochemical responses. A central aim is to bridge theoretical instruction and practical skill development by incorporating authentic scientific practices experimental design, hypothesis testing, data integrity, and reproducibility. The kit also includes a set of modular experiments that address core topics in redox chemistry, electrochemical kinetics, electrode processes, and analytical detection limits. Validation was conducted across multiple educational levels to assess usability, learning outcomes, and student engagement. Quantitative metrics include pre- and post-instruction assessments of conceptual knowledge, practical competencies, and scientific reasoning, complemented by qualitative feedback from students and instructors regarding ease of use, perceived relevance, and classroom integration. Results indicate significant improvements in students’ ability to interpret voltammetric curves, understand the influence of electrode modification on sensitivity and selectivity, and apply electrochemical methods to real-world analytes, such as environmental contaminants and food safety indicators. The study also analyzes cost-benefit and implementation constraints, outlining scalable production pathways and potential for remote or resource-limited settings through alternative power sources and offline data logging. The reliability and robustness of the sensor kit were evaluated through repeated trials, calibration checks, and cross-lab comparisons to ensure consistency across diverse educational environments. The implications for STEM education include enhanced student motivation via hands-on exploration, the development of transferable laboratory skills, and the potential for cross-curricular integration with chemistry, physics, environmental science, and data science. Limitations and future work are identified, including expansion of probe options to broaden analytical scope, refinement of calibration protocols for heterogeneous classroom conditions, and the incorporation of teacher professional development modules to maximize instructional impact. Overall, the interactive electrochemical kit demonstrates a feasible, scalable approach to enrich electrochemistry education, promote scientific inquiry, and prepare students with practical competencies aligned to contemporary analytical techniques.

Project Overview

What This Project Is About

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A practical project to design a simple, affordable sensor kit that lets students explore redox chemistry (how electrons are transferred in reactions) and common analytical techniques. The kit will be easy to assemble, safe for classroom use, and aimed at strengthening hands-on understanding of measurement, data collection, and interpretation in high-school and undergraduate labs.

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The Problem It Addresses

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Many classrooms lack affordable tools to demonstrate real electrochemical concepts. Traditional demonstrations can be expensive or rely on specialized equipment. This project fills the gap by creating a low-cost kit that enables students to run basic redox experiments, collect data, and compare results, thereby improving engagement and learning outcomes.

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Objectives of the Project

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1. Develop a low-cost, easy-to-assemble electrochemical sensor kit.
2. Demonstrate core redox concepts through hands-on experiments.
3. Provide safe, step-by-step lab activities aligned with teaching goals.
4. Create a simple data logging and analysis workflow.
5. Assess usability and learning impact in real classrooms.

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What You Will Do Step by Step

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1. Review basic electrochemistry concepts and identify key experiments.

2. Design the sensor kit with inexpensive components and safety features.

3. Develop simple lab activities and a data logging plan (manual or digital).

4. Build a prototype and test it in controlled settings.

5. Collect student feedback and measure learning outcomes.

6. Analyze data to evaluate accuracy and reliability of measurements.

7. Refine the kit based on results and feedback.

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Expected Outcome

A functional, classroom-ready electrochemical sensor kit accompanied by a short user guide, basic experiments, and a simple data-analysis routine. The project should show improved student engagement and understanding of redox processes and analytical methods, along with a scalable model for adoption in schools.