Iron Nanoparticles Protected by Chainmail‐structured Graphene for Durable Electrocatalytic Nitrate Reduction to Nitrogen

Abstract

The electrochemical nitrate reduction reaction (NO 3 RR) is an appealing technology for regulating the nitrogen cycle. Metallic iron is one of the well-known electrocatalysts for NO 3 RR, but it suffers from poor durability due to leaching and oxidation of iron during the electrocatalytic process. In this work, a graphenenanochainmail-protected iron nanoparticle (Fe@Gnc) electrocatalyst is reported. It displays superior nitrate removal efficiency and high nitrogen selectivity. Notably, the catalyst delivers exceptional stability and durability, with the nitrate removal rate and nitrogen selectivity remained � 96 % of that of the first time after up to 40 cycles (24 h for one cycle). As expected, the conductive graphene nanochainmail provides robust protection for the internal iron active sites, allowing Fe@Gnc to maintain its long-lasting electrochemical nitrate catalytic activity. This research proposes a workable solution for the scientific challenge of poor lasting ability of iron-based electrocatalysts in large-scale industrialization.

Plant Growth Regulation in Cell and Tissue Culture In Vitro

“…Thus, on one hand, ammonium is beneficial for plant nutrition. On the other hand, the application of ammonium only to plant cells leads to extremely quickly uptake and nitrogen overloading [ 34 , 35 , 36 , 37 ]. Several recent investigations have suggested that nitrogen signaling is directly linked with auxin signaling [ 38 , 39 ] and epigenetic modifications [ 36 ].…”

High-throughput screening for efficient dual-atom catalysts in electrocatalytic nitrate reduction to ammonia via dissociation–association mechanism

“…Changes in the microenvironment also have a tremendous regulatory effect on the catalytic performance of materials. [33][34][35] Therefore, we also manipulate the microenvironment by reducing the N atoms around TiFe atoms, thereby exploring the inuence of the microenvironment on the catalytic performance of TiFe/g-C 3 N 4 . As shown in Fig.…”

Nitrate Reduction by NiFe-LDH/CeO2: Understanding the Synergistic Effect between Dual-Metal Sites and Dual Adsorption

“…With the large-scale discharge of industrial wastewater and unreasonable use of fertilizers, nitrate (NO 3 – ) has seriously polluted water resources. − Effective conversion of NO 3 – helps to solve the problem of environmental pollution and produce products with utilization value. Due to the low N–O dissociation energy and high solubility, NO 3 – could be reduced to ammonia (NH 3 ) through eight-electron transfer and the conversion efficiency mainly depends on the reaction rate and selectivity. − Electrocatalytic nitrate reduction reaction (EC-NITRR) is considered as a green route to the selective hydrogenation of NO 3 – , but the mismatch between the surface reaction rate and the diffusion rate of NO 3 – significantly limits the actual performance of the EC-NITRR system. , Inspired by traditional sewage treatment, the adsorption can promote the concentration of substrate on the surface of catalyst, which would be a feasible approach to address the limitations of surface reaction rate of EC-NITRR. , …”