Dear Colleagues,

The need for global decarbonization has escalated, especially in the past two decades, due to the uncontrolled use of fossil fuels and the immense emissions of greenhouse gases in the atmosphere, causing severe impacts on both the environment and human health. From this perspective, humankind is forced to turn to more environmentally friendly energy sources, with hydrogen standing out and leading the way. Since the early 1990s, when hydrogen first appeared on the energy stage as a potential solution to the ongoing use of fossil fuels, we have come a long way, and now hydrogen is considered to be the most prominent alternative fuel and the fuel of both the present and the future.

Several technologies have evolved through the years, for hydrogen production/storage and utilization, while at the same time, the field of hydrogen applications has expanded rapidly in all areas of our daily lives. Hydrogen production methods are steadily becoming more feasible, allowing hydrogen to permeate even deeper in the global market. Having in mind that the global hydrogen market is USD 700 billion, one can easily comprehend the importance of hydrogen. 

For the time being, for applications such as power generation, fuel cell vehicles are the most dominant in terms of hydrogen utilization, but they are expected to expand even further, considering the increasingly stringent legislation in regard to the greenhouse emissions. Specifically, the International Maritime Organization (IMO) recently announced that ships should reduce their CO₂ emissions by 50% by the year 2050, which adds more pressure to the marine industry for a complete turn as regards fossil fuel usage. The use of hydrogen in marine applications has already gathered the interest of both the scientific community and the industry, while the first hydrogen powered ferries will soon appear at the horizon.

This Special Issue aims to bring together innovative hydrogen production processes and technologies with their commercial applications to further increase the impact of hydrogen on the global energy market. Original research articles and comprehensive reviews along with well-documented case studies will be considered for publication. 

Dr. Petros G. Savva
Dr. Stathis P. Theofilou
Guest Editors

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• Green hydrogen production
• Maritime
• Fuel cells
• Hydrogen storage