Biohydrogen production in bioreactors: Global trends, key factors, and emerging directions.

This study delves into the burgeoning realm of biohydrogen production from renewable resources, with a particular focus on the role of bioreactors in addressing the worldwide demand for sustainable energy. It highlights the importance of selecting appropriate microorganisms, optimizing cultivation conditions, and designing efficient bioreactors. The research demonstrates how utilizing agricultural and industrial waste can substantially cut greenhouse gas emissions. A bibliometric analysis shows a marked increase in publications, with China initially at the forefront, though India is rapidly gaining ground. While China leads regarding the H-index and citations, notable contributions come from India and South Korea. Funding from agencies in China and Brazil, as are contributions from specific scientific journals, is crucial. Co-authorship and co-citation analysis pinpoint key researchers and collaborative networks. Moreover, keyword trends like "dark fermentation," " Enterobacter aerogenes ," and "lignocellulosic biomass" indicate evolving research directions. Overall, the findings highlight China's dominance in the field and offer strategic insights into future developments in biohydrogen production for cleaner energy solutions. [Display omitted] • The study highlights bioreactors' role in advancing sustainable energy. • Highlights optimal microorganism selection and cultivation for biohydrogen. • Agricultural and industrial waste use reduces greenhouse emissions. • Bibliometric analysis shows rising research, China leading, and India advancing. • Funding from China and Brazil and key journals are vital for advancing research. [ABSTRACT FROM AUTHOR]