As the importance of eco-friendly technologies increases, hydrogen vehicles are gaining significant attention as a key component of future mobility. However, the sensor technology required to accurately measure the concentration of high-purity hydrogen gas, which serves as the fuel for hydrogen vehicles, currently lacks the sensitivity needed for commercialization and remains at a demonstrative stage. This study aims to enhance the detection performance of hydrogen sensors by optimizing the fabrication process of a membrane electrode assembly (MEA) with a Pt-based electrode-electrolyte-electrode structure, where the proton-conducting electrolyte is sandwiched between upper and lower Pt electrodes. The MEA was fabricated using a hot press method, and the process was optimized by adjusting pressure, temperature, and time parameters to improve both the physical and electrical properties of the MEA. The hydrogen sensor produced using the optimized MEA showed improved sensitivity. This enhancement enables the effective monitoring of high-purity hydrogen gas used in hydrogen vehicles, thereby improving the fuel efficiency of these vehicles.
