Hydrogen can be made from water using different technologies like alkaline water electrolysis, proton exchange membrane water electrolysis, and high-temperature solid oxide electrolysis. These methods can help replace fossil fuels with renewable energy in transport and industry. Researchers at DLR have been working on improving electrolysis technologies, such as developing a new type of gas diffusion layer that can reduce costs. They are also studying ways to improve the efficiency of high-temperature co-electrolysis.