Electro-synthesis of ammonia from nitrogen at ambient temperature and pressure in ionic liquids

Ammonia as the source of most fertilizers has become one of the most important chemicals globally. It also is being increasingly considered as an easily transported carrier of hydrogen energy that can be generated from stranded'' renewable-energy resources. However, the traditional Haber-Bosch process for the production of ammonia from atmospheric nitrogen and fossil fuels is a high temperature and pressure process that is energy intensive, currently producing more than 1.6% of global CO2 emissions. An ambient temperature, electrochemical synthesis of ammonia is an attractive alternative approach, but has, to date, not been achieved at high efficiency. We report in this work the use of ionic liquids that have high N-2 solubility as electrolytes to achieve high conversion efficiency of 60% for N-2 electro-reduction to ammonia on a nanostructured iron catalyst under ambient conditions.