近 30 年(1994-2023)中国液氢领域研究热点、前沿及演进

Under the goal of“dual carbon”, liquid hydrogen is rapidly penetrating from the aerospace field to the civilian sector. To accurately grasp the research dynamics and development trends in the field of liquid hydrogen in China, a bibliometric study was conducted using the literature visualization and analysis tool CiteSpace. With“liquid-hydrogen”as the research topic, a dataset of papers published by Chinese scholars from 1994 to 2023 was retrieved from the core databases of China National Knowledge Infrastructure (CNKI) and Web of Science (WoS). The study focused on conducting bibliometric and visualization analyses of the number of publications, research teams and institutions, research hotspots, and frontier analysis. The results reveals that the number of publications has increased rapidly since 2020, indicating a shift in liquid hydrogen research towards civilian applications, with a surge in research outputs. The annual number of English papers has gradually exceeded that of Chinese papers. High-yielding authors are clustered significantly, yet there is still considerable potential for collaboration among research institutions. Research hotspots exhibit significant migration and aggregation patterns, with liquid hydrogen propellants for on-orbit thermal management, efficient insulation technology for storage tanks, and hydrogen liquefaction technology as the main focuses in recent years. Additionally, the safety of liquid hydrogen is gaining increasing attention. Over the past 30 years, most research frontiers have been in the aerospace field, but since 2019, civilian sectors such as“hydrogen energy”, “hydrogen production”, “hydrogen liquefaction”and“hydrogen storage”have emerged as research frontiers in liquid hydrogen. This study's findings have a positive impact on further promoting the vigorous development of liquid hydrogen research in China.