In particular, more attention is being paid to the electrolysis of water for the production of hydrogen a number of researches are being conducted to collect renewable energy. Here we have comprehensively reviewed all water electrolyzers research directions through computational analysis using citation networks to objectively identify emerging provides interdisciplinary information to forecast technologies and trends. The results show that all research areas increase the number of publications every year, and the following two areas in particular increasing in number of publications: "microbial electrolysis" and "alkaline catalysts" water electrolyzer and polymer electrolyte membrane water electrolyzer.