Efficient nitric oxide electroreduction toward ambient ammonia synthesis catalyzed by a CoP nanoarray

Abstract

The ever-increasing anthropic NO emission from fossil fuel combustion has resulted in a series of severe environmental issues. Ambient electrocatalytic NO reduction has emerged as a promising route for sustainable...

Chemical-Potential-Dependent Thermodynamic Study of Electrochemical Nitric Oxide Reduction to Ammonia on Single-Cluster Catalysts

“…On the basis of the above discussion, Ni 3 @C 3 N 4 , Co 3 @ C 3 N 4 , and Cu 3 @C 3 N 4 are supposed to be the promising catalysts for NORR. Moreover, their catalytic performances are comparable with the reported high-NORR-activity materials consisting of Co or Cu components, such as CoP nanoarray (ΔG(PDS) = 0.05 eV), 12 Cu@g-C 3 N 4 (ΔG(PDS) = 0.37 eV), 57 and Ru-doped Cu material (ΔG(PDS) = 0.06 eV). 15 And the highly active Ni 3 @C 3 N 4 also suggests that the Ni component may be worth exploring in future experiments for NORR process.…”

“…A promising alternative to the large-scale H–B process is the electrochemical synthesis of ammonia, which reduces substantial energy costs and environmental pollution. , Therefore, many experimental and theoretical studies related to reducing different nitrogen forms (N 2 , NO, NO 2 , NO 3 – , etc.) to ammonia are widely reported to find the optimal catalyst and clarify the underlying catalytic mechanisms. − In particular, the electrochemical nitric oxide reduction (NORR) to ammonia, which is theoretically regarded to be a more favorable pathway than direct nitrogen reduction reaction (NRR) based on the standard redox potentials of reducing N 2 ( E 0 = 0.056 V vs SHE) and gaseous NO ( E 0 = 0.72 V vs SHE) toward NH 3 /NH 4 + , has recently been extensively investigated. − Among these relevant theoretical analyses, the most commonly applied model is based on the conventional computational hydrogen electrode model (CHE) proposed by Nørskov et al Utilizing this method, one can calculate the reaction free energies of multiple electron transfer steps under a preset potential, and then the extensively used free energy diagram can be constructed to evaluate the thermodynamic possibility of the system. It should be noted, particularly, that all of the free energies of catalysts and adsorbed intermediates are calculated with the assumption of neutral charge.…”

Recent advances in nanostructured heterogeneous catalysts for N-cycle electrocatalysis

“…The potential-determining step on the Ni2P(111) surface was identified as *NO to *NOH. Our group also validated TMPs such as FeP [366] and CoP [367] as active catalysts for NO electroreduction to NH3. These works highlight that the high-efficiency electrohydrogenation of NO to NH3 can be achieved on TMP-based catalysts.…”

Construction of MnxCoyO4/Ti electrocatalysts for efficient bifunctional water splitting

“…Three-dimensional (3D) flower-like Mn x Co y O 4 microflowers were grown in situ on a titanium mesh (Ti) by a hydrothermal method. The Ti mesh as a substrate for an electrocatalyst has obvious advantages of low cost, good electric conductivity, 31,32 poor electrochemical activity for clean background and the ability to load more catalysts than conventional electrodes. 33,34 Electrochemical performance tests show that the HER and OER overpotentials of 168 and 229 mV are required to obtain a current density of 10 mA cm −2 in 1 M KOH solution.…”