Boron-Doped TiO2 for Efficient Electrocatalytic N2 Fixation to NH3 at Ambient Conditions

NH3 synthesis almost relies on the energy-intensive Haber-Bosch process with abandoned CO2 emission. Electrochemical N-2 reduction offers an environmentally friendly process for sustainable artificial N-2 fixation at ambient conditions, but stable and efficient catalysts are demanded for the N-2 reduction reaction (NRR). In this Letter, we report that boron-doped TiO2 acts as an efficient non-noble-metal NRR catalyst for electrochemical N-2 reduction to NH3 at ambient conditions. This catalyst delivers remarkable NRR performance in 0.1 M Na2SO4 with a NH3 yield of 14.4 mu g.h(-1).mg(cat)(-1). and a Faradaic efficiency of 3.4% at -0.8 V vs reversible hydrogen electrode. Notably, it is also excellent in electrochemical durability and selectivity for NH3 formation.