Interface and processing circuit design for ionic liquid hydrogen sensors

Abstract

Hydrogen detection is essential for fuel-cell safety, hydrogen storage, and leak prevention. Ionic-liquid electrochemical sensors generate ultra-low currents (pA--nA), requiring highly sensitive acquisition. This thesis work developed a precision analog front end featuring a potentiostat for stable electrode bias and a transimpedance amplifier with selectable feedback up to 1GOhm for reliable current-to-voltage conversion. Input biasing and low-pass filtering improve stability and noise suppression. Although designed for IL-based H2 sensors, the system is adaptable to other platforms requiring pico- to nano-amp current measurement.