Activation of MoS₂ monolayer electrocatalysts via reduction and phase control in molten sodium for selective hydrogenation of nitrogen to ammonia

Abstract

Electrochemical nitrogen fixation under ambient conditions is promising for sustainable ammonia production but is hampered by high reaction barrier and strong competition from hydrogen evolution, leading to low specificity and...

Advances in ambient selective electrohydrogenation of nitrogen to ammonia: strategies to strengthen nitrogen chemisorption

“…Therefore, S-containing species, such as transition metal sulfides, have been widely used in NRR processes. 45,46 Furthermore, the introduction of SVs into sulfur-based catalysts is also expected to accelerate NRR processes. 45 Recently, Yan's group developed a facile method to shear the S-edge using VS 2 as a model electrocatalyst (VS 2 -350) and explored its catalytic activity for electrocatalytic NRR.…”

“…45,46 Furthermore, the introduction of SVs into sulfur-based catalysts is also expected to accelerate NRR processes. 45 Recently, Yan's group developed a facile method to shear the S-edge using VS 2 as a model electrocatalyst (VS 2 -350) and explored its catalytic activity for electrocatalytic NRR. 47 Raman and XPS demonstrated the removal of the S-edge, while the negative shift of the characteristic peak in the V 2p XPS spectrum indicated the formation of SVs.…”

Copper‐Phthalocyanine‐based Covalent Organic Polymers for Electrocatalytic Ambient Ammonia Synthesis

“…To further confirm the formation of NH 3 15 N 2 is used instead of 14 N 2 as the feeding gas and performed the test again under the À 0.3 V (vs. RHE) and the 1 H NMR spectra curves are shown + species are detected after using the 15 N 2 as the feeding gas, whereas 14 N 2 as the nitrogen source generates a triplet coupling peak assigned to 14 We used density functional theory (DFT) calculations to understand the catalytic performance of CuPc for NRR. Singleatom catalysts (SACs) have higher catalytic performance due to their unsaturated coordination configuration and the desired metal-atom reactivity.…”

“…Despite the growing interest, the intense competitive hydrogen evolution reaction (HER) and the excessively high bond energy of the N�N bond results in slow kinetic activity and low selectivity of the electrochemical NRR process, which severely limit the development of NRR. [13,14] To overcome these difficulties, various catalysts have been developed. Recently, rationally designed NRR catalysts based on covalent organic polymers (COPs) have received much attention because of their adjustable structures with high thermodynamic stability, desirable multi-element compositions, and maximum atomic utilization, showing the demonstrated performance in the fields of oxygen reduction, water splitting, and CO 2 reduction.…”

“…Electrochemical nitrogen reduction under ambient conditions, especially in combination with renewable energy sources, is considered a powerful alternative to the high‐temperature, high‐pressure Haber‐Bosch process. Despite the growing interest, the intense competitive hydrogen evolution reaction (HER) and the excessively high bond energy of the N≡N bond results in slow kinetic activity and low selectivity of the electrochemical NRR process, which severely limit the development of NRR [13,14] . To overcome these difficulties, various catalysts have been developed.…”