The biggest producer of publications on hydrogen storage is China, followed by Japan, the US and Korea. The leading countries are shown to pay attention to both academic research and practical development. Toyota leads the way in patents, supporting it's push in Japan for FCVs. While China has had the most publications overall in the GHE space, Japan leads the way in fuel cell publications, followed by China, the US, south Korea and Germany. Japan has the most patents, which aligns with 9 of the top 15 patent assignees being Japanese based multinational companies (Table ). China's publications are split almost evenly between patents and journals. The US comes in third with GM being its highest patent assignee, followed by South Korea with Hyundai taking the lead followed by Kia, and then Germany with Bosch and Daimler.