The article discusses the challenges associated with traditional N2H4 production methods, highlighting their environmental impact and inefficiency. It introduces a novel electrochemical process for synthesizing N2H4 from NOx with controllable N-N coupling efficiency. By utilizing a combination of catalysts such as WO3 and mediator molecules like Diphenyl ketone, the process achieved a high yield of 98.5% and selectivity of 88.7% for the conversion of NOx to N2H4. The study demonstrates the importance of designing effective catalytic systems and selecting suitable solvents to enhance N-N coupling activity. Through a series of controlled experiments and theoretical calculations, the mechanistic insights into the ketone-mediated N-N coupling process are investigated. The results show that the use of Ph2CN* intermediates on WO3 catalysts plays a crucial role in driving controlled N-N coupling with high selectivity. Overall, the innovative process offers a sustainable and efficient approach to N2H4 synthesis, contributing to the reduction of CO2 emissions and promoting a greener future.