Oxygen‐Doped Porous Carbon Nanosheet for Efficient N₂ Fixation to NH₃ at Ambient Conditions

Abstract

NH3 is one of the largest‐volume industrial chemicals synthesized in the world. It not only is a kind of important chemical base materials to produce fertilizers, plastics and explosives, but also can serve as a clean energy carrier with high hydrogen content for a sustainable energy supply. N2 is the most abundant gas in atmosphere, but its inert character caused by the strong triple bond, impedes itself from being converted to NH3. In nature, this shortcoming is overcome by biological N2 fixation utilizing nitrogenase enzymes. Industrially, fixation of N2‐to‐NH3 prevailingly depends on Haber‐Bosch process using Ru‐ or Fe‐based catalysts, but this process consumes large energy and emits heavy carbon which increases crisis of global warming.

Current Progress of Electrocatalysts for Ammonia Synthesis Through Electrochemical Nitrogen Reduction Under Ambient Conditions

“…À1 at À0.75 Vv s. RHE in 0.5 m LiClO 4 , and the FE was 4.83 %. For specific data, see Figure 14 d. Chen et al [176] prepared metal-free NRR electrocatalysts-O-doped porousc arbon nanosheets (O-CNS) show high selectivity and stabilityi nt he NRR. In 0.1 m HCl, aN H 3 yield rate of 18.03 mgh À1 mg cat.…”

2D Electrocatalysts for Converting Earth‐Abundant Simple Molecules into Value‐Added Commodity Chemicals: Recent Progress and Perspectives

“…Other B‐doped 2D NRR electrocatalysts such as B, N‐codoped carbon nanosheethave also been recently reported . In addition, the doping of other p‐block elements (e.g., O and S) into graphene has been verified to yeild NRR activities. Although the effectiveness of heteroatom doping‐induced electrocatalytic activities for a wide spectrum of materials toward various reactions have been extensively reported, currently, heteroatom doping routes to enhance the performance of 2D NRR electrocatalysts are largely unexplored.…”

Atomic Structure Modification for Electrochemical Nitrogen Reduction to Ammonia

“…In 2019, Sun and co‐workers prepared a S‐doped carbon nanosphere (S@CNS) with a NH 3 yield of 19.07 µg h −1 mg cat −1 and an FE of 7.47% at −0.7 V, nearly fourfold enhancement when compared with that of the undoped one (3.70 µg h −1 mg cat −1 ; 1.45%) . Recently, they further introduced oxygen (O) into porous carbon nanosheet . The resulted catalysts could achieve a high FE of 10.3% with the NH 3 yield of 18.03 µg h −1 mg cat −1 .…”