Fe Foam-Supported FeS₂–MoS₂ Electrocatalyst for N₂ Reduction under Ambient Conditions

Abstract

Highly efficient catalysts with enough selectivity and stability are essential for electrochemical nitrogen reduction reaction (e-NRR) that has been considered as a green and sustainable route for synthesis of NH 3 . In this work, a series of three-dimensional (3D) porous iron foam (abbreviated as IF) selfsupported FeS 2 −MoS 2 bimetallic hybrid materials, denoted as FeS 2 −MoS 2 @IF x , x = 100, 200, 300, and 400, were designed and synthesized and then directly used as the electrode for the NRR. Interestingly, the IF serving as a slow-releasing iron source together with polyoxomolybdates (NH 4 ) 6 Mo 7 O 24 •4H 2 O as a Mo source were sulfurized in the presence of thiourea to form self-supported FeS 2 −MoS 2 on IF (abbreviated as FeS 2 −MoS 2 @IF 200 ) as an efficient electrocatalyst. Further material characterizations of FeS 2 −MoS 2 @IF 200 show that flower cluster-like FeS 2 −MoS 2 grows on the 3D skeleton of IF, consisting of interconnected and staggered nanosheets with mesoporous structures. The unique 3D porous structure of FeS 2 −MoS 2 @IF together with synergy and interface interactions of bimetallic sulfides would make FeS 2 −MoS 2 @IF possess favorable electron transfer tunnels and expose abundant intrinsic active sites in the e-NRR. It is confirmed that synthesized FeS 2 −MoS 2 @IF 200 shows a remarkable NH 3 production rate of 7.1 ×10 −10 mol s −1 cm −2 at −0.5 V versus the reversible hydrogen electrode (vs RHE) and an optimal faradaic efficiency of 4.6% at −0.3 V (vs RHE) with outstanding electrochemical and structural stability.

CuCo2S4–MoS2 nanocomposite: a novel electrode for high-performance supercapacitors

“…7,13,17,[24][25][26][27][28] For this, 2D layered transition metal dichalcogenide, MoS 2 with a high specific surface area appears to be a promising candidate due to its high intrinsic fast ionic conductivity, large specific capacity of 1504 F g À1 and ability to prevent self-agglomeration of CuCo 2 S 4 . [29][30][31][32][33] The sheet like morphology of MoS 2 promotes ion insertion between its layers resulting in a high charge storage capacity and large electrochemical double layer capacitance (EDLC). 6,34 Additionally, MoS 2 possesses notable pseudocapacitance ability since the central Mo ion has various oxidation states from +2 to +6.…”

All Transition Metal Selenide Composed High‐Energy Solid‐State Hybrid Supercapacitor

“…One of the leading classes of important functional materials, transition metal chalcogenides (TMDs) demonstrates unique electronic structures and physical properties because of their distinct geometric structures having weak interlayer van de Waals coupling, different compositions, and rich phase structures providing a library of materials for potential applications in energy storage and conversion devices. [4,[9][10][11] The transition metal selenides (TMSs) are an emerging class of typical TMDs and potential candidates for SCs owing to their lower bandgap, excellent electrical conductivity, and superior electrochemical performance. [12][13][14] Due to the presence of interstitial selenium, the structure of TMSs can be properly modulated to Transition metal selenides (TMSs) have enthused snowballing research and industrial attention due to their exclusive conductivity and redox activity features, holding them as great candidates for emerging electrochemical devices.…”

A series of POM compounds constructed using a flexible ligand containing three coordination groups: electrocatalytic and photocatalytic reduction and amperometric detection of Cr(vi)

“…Polyoxometalates (POMs), as metal-oxo clusters with rich structures and various properties, have been widely used in many fields such as electricity, optics, catalysis, and materials. 1–9 The combination of POMs as inorganic units and transition metal complexes (TMCs) can form a variety of structures. 10 Moreover, the selection of appropriate organic ligands is very important for the construction of POM–TMC structures.…”