Self-Powered Point-of-Care Device for Galvanic Cell-Based Sample Concentration Measurement

A novel self-powered point-of-care low-power electronics approach for galvanic cell-based sample concentration measurement is presented. The electronic system harvests and senses at the same time from the single cell. The system implements a solution that is suitable in those scenarios where extreme low power is generated from the fuel cell. The proposed approach implements a capacitive-based method to perform a non-linear sweep voltammetry to the cell, but without the need to implement a potentiostat amplifier for that purpose. It provides a digital-user readable result without the need for external non-self-powered devices or instruments compared with other solutions. The system conception was validated for a particular case. The scenario consisted of the measurement of a NaCl solution as the electrolyte, which was related to the conductivity of the sample. The electronic reader continuously measured the current with a transfer function gain of [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] (−1). The overall system exhibited a maximum coefficient of variation of [Formula: see text] %, which was an improvement compared with the state-of-the-art. The proof of concept of this electronics system was validated with a maximum power consumption of [Formula: see text] [Formula: see text] using commercial-off-the-self parts.