Modeling carbon-free energy conversion systems: enhanced hydrazine-assisted hydrogen production with dual-electric-field effect on needle-like Ru/CoP catalysts

Abstract

The development of carbon-free energy conversion systems is crucial for addressing global energy and environmental challenges. This study presents a comprehensive model of hydrazine-assisted alkaline water electrolysis for hydrogen production, utilizing a needle-like Ru/CoP electrocatalyst. We demonstrate that this system offers significant economic and environmental advantages over traditional methods. Our model elucidates the dual-electric-field enhancement mechanism, combining a local electric field induced by the needle-like structure and a built-in electric field within the catalyst. The local field increases K⁺·H₂O concentration and weakens hydrogen bond networks, enhancing water transport and *H production. Concurrently, the built-in field generates electron-deficient Ru sites, improving hydrazine and intermediate adsorption. This synergistic effect optimizes the hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR). We validate our model through the successful implementation of a direct hydrazine fuel cell and a hydrazine–nitrate battery, achieving a self-powered, carbon-free hydrogen production system. This work not only advances the design of multi-electric field electrocatalysts but also provides valuable insights for next-generation energy cycles, paving the way for efficient, environmentally friendly energy conversion systems.