Promoting Nitrogen Electroreduction on Mo2C Nanoparticles Highly Dispersed on N-Doped Carbon Nanosheets toward Rechargeable Li-N2 Batteries

N-2 fixation is a challenging and rewarding issue. However, the traditional Haber-Bosch process consumes a large amount of fossil fuels, resulting in serious environmental pollution. Instead, N-2 electroreduction is a promising way to convert and utilize N-2. Among various N-2 electroreduction methods, combining N-2 reduction with batteries is simple and efficient. Here, a composite of ultrasmall Mo2C particles highly dispersed on N-doped carbon nanosheets is prepared, and it is applied as the air cathode for Li-N-2 batteries. Li-N-2 batteries show high discharge capacity and superior reversibility, demonstrating that the Li-N-2 battery is a promising platform for N-2 electroreduction and electrochemical energy storage.