Performance Improvement Strategy of Photocatalytic Ammonia Synthesis Catalyst

Photocatalytic nitrogen fixation is driven by solar energy. N-2 and H2O are used to directly produce NH3 at normal temperature and pressure, and the process has zero carbon emissions. It is one of the most promising artificial nitrogen fixation methods and has attracted wide attention from researchers in recent years. Limited by the difficult activation of N-2, low utilization rate of photogenerated carrier and low utilization rate of sunlight, the ammonia production efficiency is still not high, so improving the ammonia production efficiency is the focus of research in the field of photocatalytic ammonia synthesis. Starting from the three important processes of N-2 adsorption activation, carrier separation and migration, and surface reaction, it is very promising to promote the activation and conversion of N-2 under mild conditions and produce NH3 efficiently by reasonable modification of the catalyst. This paper mainly studied the modification of photocatalysts, summarized the influence of N-2 molecular adsorption and activation ability, photogenerated electron transfer ability and light utilization on the ammonia production efficiency, analyzed the research in recent years in these fields, and finally summarized the modification strategy of photocatalytic ammonia synthesis catalyst.