A Zn–nitrite battery as an energy-output electrocatalytic system for high-efficiency ammonia synthesis using carbon-doped cobalt oxide nanotubes

A Zn-NO 2 − battery with C/Co 3 O 4 catalyst cathode is developed as an energy-output electrocatalytic system that can simultaneously convert NO 2 − to NH 3 with high faradaic efficiency and supply electricity with a power density of 6.03 mW cm −2 .