Biohydrogen production from microalgae-Major bottlenecks and future research perspectives.

The overuse of fossil fuels has increased greenhouse gas emissions, worsening climate change and energy insecurity. While hydrogen is a promising alternative energy source, current production methods rely heavily on fossil fuels and emit carbon dioxide. This undermines hydrogen's potential as a clean energy carrier. Microalgae-based hydrogen production offers a sustainable alternative because microalgae use sunlight and do not emit carbon dioxide during hydrogen generation. However, the path to commercializing this technology remains unclear. Prior research has shown that microalgae can produce hydrogen through photosynthesis, but the mechanisms and enzymes involved are not fully understood. This gap motivated a review to synthesize current knowledge on microalgae hydrogen production. That uncertainty drove the need to analyze the major bottlenecks and economic feasibility of scaling the process. No prior work had resolved the full life cycle and cost implications of this method. The need for a comprehensive review became clear due to the fragmented nature of existing studies.

This review aims to clarify the mechanisms and enzymes involved in microalgae-based hydrogen production. It seeks to identify the major challenges in commercializing this process and assess its economic and environmental viability. The study addresses the need for a unified understanding of photobiological hydrogen production from microalgae. By analyzing existing literature, the authors aim to guide future research directions. The motivation stems from the urgent need to develop sustainable energy alternatives. The review also evaluates life cycle analysis and cost-effectiveness of the process. This study does not propose new experiments but synthesizes findings from prior work. The goal is to inform both scientific and industrial stakeholders about the current state of the technology.

The authors conducted a comprehensive literature review of peer-reviewed studies on microalgae hydrogen production. They focused on the biochemical pathways and enzymes responsible for hydrogen generation. The review included studies on the photosynthetic processes and the role of hydrogenases. The authors compared different microalgae species and their hydrogen production capabilities. They also analyzed the economic models and life cycle assessments of the process. The review approach included categorizing findings into mechanisms, challenges, and future directions. The synthesis of findings was structured to highlight gaps and opportunities for further research. The review does not rely on original data but on the interpretation of published results.

The review highlights that microalgae produce hydrogen through photosynthetic processes involving hydrogenase enzymes. The efficiency of hydrogen production is limited by the availability of these enzymes and the presence of oxygen. The study found that the hydrogenase activity is often inhibited by oxygen, reducing overall yield. The life cycle analysis showed that microalgae-based hydrogen has lower carbon emissions compared to fossil fuel-derived hydrogen. Economic assessments revealed high production costs due to the need for controlled cultivation systems. The review identified the need for improved strain selection and genetic modifications to enhance hydrogenase activity. It also noted the importance of optimizing light and nutrient conditions for maximum output. Future research should focus on reducing costs and improving the scalability of the process.

The synthesis of findings suggests that microalgae-based hydrogen production is a promising but underdeveloped technology. The authors propose that further research should focus on improving hydrogenase activity and reducing oxygen inhibition. They suggest that economic and environmental assessments are critical for commercial viability. The review indicates that strain optimization and cultivation system improvements are necessary. The authors conclude that current limitations include high costs and low production efficiency. They emphasize the need for interdisciplinary research to address these challenges. The findings suggest that photobiological hydrogen production could become a viable alternative if these issues are resolved. The review does not claim that microalgae hydrogen is the definitive solution but highlights its potential when further developed.