This work demonstrates the potential of TiO₂ nanosheet for selective and rapid nitrate reduction to ammonia under acidic conditions. Hybridized with iron phthalocyanine, the resulting catalyst displays remarkably improved efficiency toward ammonia formation. An alkaline-acid hybrid Zn-nitrate battery was developed with high open-circuit voltage and power density. The environmental sulfur recovery can be powered by this battery, and a hydrazine-nitrate fuel cell can be developed for simultaneous hydrazine/nitrate conversion and electricity generation. This work highlights the potential of acidic nitrate reduction for ammonia electrosynthesis and energy conversion.
