Due to the growing demand for energy and impending environmental issues, fuel cells have attracted significant attention as an alternative to conventional energy technologies.

As a promising and important carbon source, utilization of carbon dioxide (CO₂) can effectively solve the energy crisis caused by fossil resource consumption and the environmental problems arising from the emission of CO₂.

Fuel cell is an electrochemical device, which can directly convert the chemical energy of fuel into electric energy, without heat process, not limited by Carnot cycle, high energy conversion efficiency, no noise and pollution.

A Co-based MOF supported on Ti ₃ C ₂ MXene was prepared via in situ growth, which can efficiently reduce nitrogen to ammonia under environmental conditions.