Abstract:

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.

Key words: renewable energy, hydrogen, liquid hydrogen, research hotspots, research frontiers, literature visualization, CiteSpace

摘要：

“双碳”目标下液氢正在快速由航天领域向民用领域渗透。为了准确把握我国液氢领域的研究动态和发展趋势，采用文献可视化分析工具CiteSpace开展了文献计量研究。以“液氢（liquid-hydrogen）”为主题，分别在中国知网（CNKI）、Web of Science（WoS）核心数据库获取了1994—2023年间中国学者所发表的论文数据集，以此为研究对象，分别从发文量、研究团队和机构、研究热点与前沿分析等方面进行了文献计量和可视化分析。结果表明：2020年开始发文量快速增长，液氢研究逐渐向民用领域渗透，研究成果呈现“井喷”态势，英文论文年发文量逐渐超过中文论文；高产作者集聚明显，但研究机构之间的合作仍有较大发展潜力；研究热点呈现显著的迁移和集聚规律，近5年来液氢研究热点主要集中在液氢推进剂在轨热管理、储罐高效绝热技术、氢液化技术等方向，同时液氢安全也正在得到越来越多的重视；30年间绝大部分研究前沿处于航天领域，2019年至今民用领域“氢能”“制氢”“氢液化”“储氢”等方向成为液氢研究前沿。本文的研究成果对进一步推动我国液氢领域研究蓬勃发展具有积极作用。

关键词: 可再生能源, 氢, 液氢, 研究热点, 研究前沿, 文献可视化, CiteSpace