Efficient ammonia photosynthesis from nitrate by graphene/Si Schottky junction integrated with Ni–Fe LDH catalyst

A Ni–Fe LDH/graphene/Si heterojunction photocathode for nitrate-to-ammonia conversion with a faradaic efficiency of 92.5% is demonstrated by direct and facile integration of Ni–Fe LDH through the single-layer graphene conductive path.