# Technology for Green Hydrogen Production: Desk Analysis
## 3 Methodology  
Writing the review article involved a systematic and structured approach to gather, analyze, and synthesize information from the Scopus database, which is a bibliographic database containing abstracts and citations for academic journal articles. For the most accurate and up-to-date information, direct access to the Scopus database was obtained on 17 August 2024 using an institutional login. To find the number of publications concerning green hydrogen production technologies from 2020 to 2024 using the Scopus database and technical reports, a step-by-step methodology for writing this article was used (Figure 7). Step I focused on defining the scope and objectives, which were formulated in the Introduction Section. Specific aspects of the desk analysis topic were identified, including green hydrogen production technologies, their applications, and recent development trends. A clear objective of the review was defined to provide information, identify gaps, and highlight future research directions. Step II was to conduct a comprehensive literature search in the Scopus database to identify relevant articles, reviews, and reports. A list of keywords and phrases related to the topic was developed and used in the search. Criteria for including or excluding studies were defined based on factors such as publication date, relevance, and study type. In Step III, titles and abstracts of search results were screened to identify potentially relevant studies, and then the full texts of selected studies were reviewed to determine their eligibility for inclusion in the review. Relevant data from the selected studies, including key findings, methodologies, and conclusions were extracted. Step IV involved data analysis and synthesis, which included qualitative and quantitative analysis and critical appraisal. The findings and amount of numerical data from the selected studies were summarized and trends and gaps in the literature were identified. The quality and validity of the studies were assessed. Step V was about organizing the review article. A structure for the article was developed, including sections such as the Introduction, Background of Analysis, Methodology, Results and Discussion, Conclusions, and Future Directions. The Introduction Section provides background information on the topic and outlines the objectives of this review. The Background of Analysis Section presents issues related to energy production from fossil fuels and renewable sources, types of hydrogen, and the water electrolysis process. The Methodology Section explains how the review article was developed. The Results and Discussion Section discusses the results of the literature review by presenting the findings from the analysis, organizing them into themes or issues, and comparing and contrasting the different studies and findings. The discussion of the results involves interpreting the findings, discussing their implications, and highlighting any gaps or limitations in the current literature. The Conclusions Section summarizes the key points and conclusions drawn, and the Future Directions Section suggests areas for future research. Step VI involved writing a review article that used clear and concise language to present the findings and avoid jargon, defined technical terms for a wider audience, and properly cited all sources using a consistent citation style (MDPI and ACS Style). It also involves the use of visual aids in the form of tables, figures, and graphs to illustrate key points and data. The described scientific methodology was applied to produce a review article on green hydrogen production technologies that is comprehensive, well-organized, and contributes valuable insights to the field. Figure 7: Outline of the scientific methodology used. The specific results of a search on the Scopus database were dependent on the criteria used and the state of the database at the time of search. Desktop analysis was performed using a complex search string to identify relevant documents.