Abstract: Developing sustainable energy solutions is critical for addressing the dual challenges of energy demand and environmental impact. In this study, a zinc-nitrate (Zn-NO₃⁻) battery system was designed for the simultaneous production of ammonia (NH₃) via the electrocatalytic NO₃⁻ reduction reaction (NO₃RR) and electricity generation. An ultrafast continuous wave CO₂ laser irradiation yielded precisely controlled CoFe₂O₄@nitrogen-doped carbon (CoFe₂O₄@NC) hollow nanocubes from CoFe Prussian blue analogs (CoFe-PBA) as the integral electrocatalyst for NO₃RR in 1.0 M KOH, achieving a remarkable NH₃ production rate of 10.9 mol h⁻¹ cm⁻² at −1.4 V versus Hg/HgO electrode with exceptional stability. In situ and ex situ methods revealed that the CoFe₂O₄@NC surface transformed into high-valent Fe/CoOOH active species, optimizing the adsorption energy of NO₃RR (*NO₂ and *NO species) intermediates. Furthermore, density functional theory calculations validated the possible NO₃RR pathway on CoFe₂O₄@NC starting with NO₃⁻ conversion to *NO₂ intermediates, followed by reduction to *NO. Subsequent protonation forms the *NH and *NH₂ species, leading to NH₃ formation via final protonation. The Zn-NO₃⁻ battery utilizing the CoFe₂O₄@NC cathode exhibits dual functionality by generating electricity with a stable open-circuit voltage of 1.38 V versus Zn/Zn²⁺ and producing NH₃. This study inspires the simple design of low-cost catalysts for NO₃RR-to-NH₃ conversion and positions Zn-NO₃⁻ battery as a promising technology for industrial applications.