Fuel cells are energy that utilizes hydrogen, one of the nation’s 10 key strategic technologies. The conversion system can contribute to minimize climate change through fossil fuel substitution and CO₂ reduction that realizes carbon neutrality and improving energy independence. High-temperature polymer membrane fuel cells have advantages in terms of high output, weight and volume reduction, and thermal management system price/weight reduction. Thus, it is suitable for future long-distance transportation applications. However, the high-temperature polymer membrane fuel cell, a next-generation fuel cell, is in the early stage of research. Our lab focuses mainly on to develop new ion exchange membranes and to identify the ion transport mechanism in a high temperature with non-humid environment.