"The objectives of Hydrogen Energy Frontier are to make students understand the important role of hydrogen energy for the realization of carbon neutral society, to master the principles, method and technologies of key hydrogen energy technologies such as hydrogen production, hydrogen storage and hydrogen utility, to know the global activities and future perspectives of hydrogen energy. The course of Hydrogen Energy Frontier is organized into four parts. In part one, the importance of hydrogen energy for a carbon neutral society and the relevant policy in a global range are addressed and the hydrogen strategy in Japan will be explained as an example. Part two focuses on the main hydrogen production technologies, such as steam reforming, alkaline water electrolysis, polymer electrolyte membrane water electrolysis and photocatalytic water splitting. Part three emphasizes the main hydrogen storage technologies, i.e. compressed hydrogen, liquid hydrogen carriers and solid hydrogen storage materials. Part four includes hydrogen utilization technologies, such as polymer electrolyte fuel cells (PEFCs), solid oxide fuel cells (SOFCs) and hydrogen combustion systems. In addition, we will discuss hydrogen safety issues, which is in great need for widespread use of hydrogen energy as hydrogen has a very broad flammability range—a 4 percent to 74 percent concentration in air. This course will provide students with a basic knowledge about hydrogen energy and discuss existing hydrogen energy technology options in the broader context of global clean energy technology development."