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This article conducts a systematic mapping and inductive analysis of existing work related to hydrogen energy policy in the Web of Science Core Collection from 1996 to 7 July 2023. First, based on bibliometrics, the research reveals the publication volume trends, influential contributors (countries, authors, organizations and journals). Second, bibliometric and content analysis were applied to vividly demonstrate the evolution of the research topic, discuss leading research topics, and provide valuable insights into issues that deserving appropriate attention in the future. The unequivocal role of policies in supporting the development of hydrogen energy is undeniable. In the future, the focal point of hydrogen energy policies should be concentrated on stimulating the creation of demand for green hydrogen, necessitating the effective evaluation of policy outcomes and ensuring the safety of hydrogen energy. Furthermore, the application scope of hydrogen energy extends beyond the transportation sector, holding potential for expansion into other high carbon‐emitting domains. With the strengthening of international collaboration in hydrogen energy, considerations of energy justice and fairness are poised to become pivotal factors in cooperation, exerting a profound influence on the attainment of long‐term development and environmental sustainability. These critical research directions will shape the future landscape of hydrogen energy policy and serve as an essential resource for policymakers, researchers, and stakeholders in this domain. [ABSTRACT FROM AUTHOR]

This document is a summary of a special issue of the Journal of Marine Science & Engineering titled "Advanced Research on Sustainable Maritime Transportation." The issue contains 15 research papers that cover various aspects of sustainable maritime transportation, including green shipping technologies, maritime safety, and sustainable port operations. The research papers explore topics such as the challenges of transitioning to low-carbon fuels for maritime diesel engines, fault-tolerant control strategies for electric ships, the impact of emission control areas on ship orders, and the effectiveness of machine learning methods in predicting a ship's carbon intensity index. Other papers focus on maritime security and sustainable port operations, discussing unmanned surface vessels, maritime safety management, and energy-saving solutions for waste heat recovery on ships. The special issue emphasizes the importance of technological innovation and policy adjustment in achieving sustainability goals in the maritime transportation industry. The research presented in these papers provides scientific guidance and practical directions for the industry's sustainable development. [Extracted from the article]