 The study shows that TiO2 nano sheet with poor hydrogen evolution activity can be used for selective and rapid nitrate reduction to ammonia under acidic conditions when hybridized with iron thalocyanine, resulting in improved efficiency. An alkaline acid hybrid ZN nitrate battery was developed with high open circuit voltage and power density, which can power environmental sulfur recovery and hydrazine, the nitrate fuel cell for simultaneous conversion, and electricity generation, broadening the field of energy conversion. This article was authored by Rong Zhong, Chuan Li, Huilin Kui, and others.