Fe₃O₄/FeS₂ heterostructures enable efficient oxygen evolution reaction

Abstract

<p>Heterostructured Fe₃O₄/FeS₂ catalysts with adjustable sulfuration degrees and variable contents of heterogeneous interfaces have been prepared <italic>via</italic> a facile <italic>in situ</italic> sulfuration route, which lead to efficient oxygen evolution reaction.</p>

Engineering Bimetallic NiFe‐Based Hydroxides/Selenides Heterostructure Nanosheet Arrays for Highly‐Efficient Oxygen Evolution Reaction

“…In addition, the Tafel slope of the heterostructure electrode (42 mV dec −1 ) illustrated in Figure 5b is smaller than NiFe‐LDH/CC (73 mV dec −1 ), NiFe(OH) x /CC (57 mV dec −1 ), (Ni, Fe)Se 2 /CC (48 mV dec −1 ), and IrO 2 (76 mV dec −1 ), also suggesting a faster kinetics. To our best knowledge, the as‐prepared heterostructure catalyst that exhibits excellent alkaline OER catalytic activity in this work exceeds the commercial IrO 2 and RuO 2 catalysts and most of the recently reported catalysts, and is among the state‐of‐the‐art OER catalysts, as shown in Figure 5c [ 26,37,42–53 ] and Table S1 (Supporting Information).…”

Interface Engineering of Ni3Fe and FeV2O4 Coupling with Carbon-Coated Mesoporous Nanosheets for Boosting Overall Water Splitting at 1500 mA cm–2

“…In Figure b, the lattice fringes of 0.205 and 0.253 nm can be observed, corresponding to the XRD results of Ni 3 Fe­(111) and FeV 2 O 4 (311), respectively. There is an obvious interface between Ni 3 Fe and FeV 2 O 4 due to the different enthalpies of Ni, Fe, and V to form the heterojunction, which could result in the rearrangement of electrons at the interface, forming electron-rich and electron-poor species, attracting H + /H 2 O and OH – adsorption energy, and thus promoting the activity. , This special structure could effectually fabricate enough defects provide abundant active sites, reduce electron/ion transmission distance, and facilitate bubble desorption. The energy dispersive spectroscopy (EDS) mappings reveal the uniform distribution of Fe, Ni, V, C, and O elements on the surface of nanosheets (Figure f–j).…”

Regulating the coordination environment of a metal–organic framework for an efficient electrocatalytic oxygen evolution reaction

“…51 In terms of microstructure design, doping heterogeneous metal atoms and different ligands into the crystal lattice can improve the electronic structure. 52–54 The latter is more challenging, 55 and the electrocatalytic performance of MOFs needs to be enhanced to the next level. 56…”

“…51 In terms of microstructure design, doping heterogeneous metal atoms and different ligands into the crystal lattice can improve the electronic structure. [52][53][54] The latter is more challenging, 55 and the electrocatalytic performance of MOFs needs to be enhanced to the next level. 56 To deal with the above challenges, we have synthesized a bimetal-organic framework (FeCo-L 1 L 2 ) using a simple and cost-effective solvothermal method using the free assembly of Fe and Co ions with 2,5-dihydroxyterephthalic acid (defined as L 1 ) and 4,6-dihydroxyisophthalic acid (defined as L 2 ).…”