Abstract
For humanity and social health, energy is essential. Hydrogen is one of several potential energy carriers for green technologies. The Black Sea seas are a rich source of "hydrogen Sulphide (H2S)", which is also a known environmental contaminant. The main drivers of hydrogen technology are global warming and the depletion of fossil fuels. Additionally, the nation's economies that depend on the importation of conventional fuel have been exposed as a result of the rising prices of these fuels due to the rising energy demand. Future renewable technologies need to be carbon-free and renewable to combat climate change on a long-term basis and reduce our reliance on foreign oil. Hydrogen can be produced using a variety of traditional and unconventional sources of energy, including "natural gas, coal, nuclear power, biomass, solar, and wind". The most ecological hydrogen production method using H2S is chosen in this research using the "technique for order of preference by similarity to ideal solution (TOPSIS)", taking into account sustainable factors which are inescapable in energy managerial problems. The "Equal Weights Method (EWM)" allocates weights to many criteria, most notably relevance weights. The rank of alternatives using the TOPSIS method for Thermal is second, Electrochemical is third, Thermochemical is fourth, Photochemical is fifth and Plasma is first. The analysis's findings indicate that plasma is the best and most suitable method for producing hydrogen in terms of delivering high conversion efficiency and environmentally friendly operations, such as handling, shipping, and storing dangerous chemicals.