The use of fossil fuels for energy demands is insufficient for escalating demands as they are limited in nature and are not environment friendly. Various microbial sources are under scanner for clean energy production out of which algae comes as a promising one. Production of biohydrogen from algae has brought a lot of hopes in the energy production sector. Algae are powerhouse of renewable chemicals including biofuel precursors. Biohydrogen is one of such biofuel precursors; it proves to be a clean and sustainable fuel and can be produced in industries. Currently however, it cannot stand up to the present energy demands of the world due to certain obstacles, such as cost effectiveness, storage and transportation of hydrogen. One of the main hurdles in algal biofuel technology is the rigid nature of algal cell wall. To get around this, pretreatment of algal biomass is imperative to overcome productivity issues, so as not to compromise biofuel yield. Improving the biofuel production at every step can make a huge difference in outcomes and thus comes up as a promising tool. Therefore, in the present state of art review, various methods of algal biomass pretreatment, different enzymes involved in hydrogen production, various factors influencing hydrogen production from algae and genetic engineering avenues have been discussed in brief.

将化石燃料用于能源需求不足以满足不断增长的需求，因为它们的性质有限且对环境不友好。各种微生物源都在扫描仪下用于清洁能源生产，其中藻类是有前途的一种。藻类生产生物氢给能源生产领域带来了许多希望。藻类是包括生物燃料前体在内的可再生化学物质的发源地。生物氢是这种生物燃料的前体之一。它被证明是一种清洁，可持续的燃料，可以在工业中生产。但是，由于某些障碍，例如成本效益，氢的存储和运输，目前无法满足世界目前的能源需求。藻类生物燃料技术的主要障碍之一是藻类细胞壁的刚性。为了解决这个问题，藻类生物质的预处理必须克服生产力问题，以免损害生物燃料的产量。改善每一步的生物燃料产量可以在结果上产生巨大的差异，因此成为有前途的工具。因此，在目前的技术综述中，已经简要讨论了藻类生物质预处理的各种方法，参与氢生产的不同酶，影响从藻类生产氢的各种因素和基因工程途径。