![]() Recognition of surface oxygen intermediates on NiFe oxyhydroxide oxygen-evolving catalysts by homogeneous oxidation reactivity. NiFe-layered double hydroxide synchronously activated by heterojunctions and vacancies for the oxygen evolution reaction. Ripple-like NiFeCo sulfides on nickel foam derived from in-situ sulfurization of precursor oxides as efficient anodes for water oxidation. ![]() Morphology and strain control of hierarchical cobalt oxide nanowire electrocatalysts via solvent effect. Self-magnetic-attracted Ni xFe( 1− xFe (1− x)O nanoparticles on nickel foam as highly active and stable electrocatalysts towards alkaline oxygen evolution reaction. “The Fe effect”: A review unveiling the critical roles of Fe in enhancing OER activity of Ni and Co based catalysts. MOF-derived sulfide-based electrocatalyst and scaffold for boosted hydrogen production. Exceptional electrocatalytic oxygen evolution efficiency and stability from electrodeposited NiFe alloy on Ni foam. Compositional engineering of sulfides, phosphides, carbides, nitrides, oxides, and hydroxides for water splitting. Recent advance and prospectives of electrocatalysts based on transition metal selenides for efficient water splitting. Recent perspectives on the structure and oxygen evolution activity for non-noble metal-based catalysts. Low-temperature molten salt synthesis of MoS 2 heterostructures for efficient hydrogen evolution reaction. In situ construction of porous hierarchical (Ni 3− xFe x)FeN/Ni heterojunctions toward efficient electrocatalytic oxygen evolution. Fe-based electrocatalysts for oxygen evolution reaction: Progress and perspectives. ![]() The addition of Fe into NiS x lightly increases the charge transfer of Ni atom to O atom, which makes deprotonation easier and thereby improves the OER performance.įeng, C. Density functional theory (DFT) calculation shows that Ni-OH deprotonation is a rate-determining step for both binary nickel-iron sulfide and nickel sulfide. In situ Raman spectroscopy shows that the generation of γ-NiOOH intermediate is essential and Fe does not directly participate in the oxygen production. Therefore, the present study reveals the enhancing effect of low valence sulfur species (S 2−) on OER in binary nickel-iron sulfide. Electrochemical tests show that the presence of low valence S species makes the catalyst have faster OER kinetics, larger active area, and intermediate active species adsorption area. Herein, a facile solvothermal method is used to synthesize acetylene black coated with nickel-iron sulfide nanosheets. Therefore, to study the role of S, Ni, and Fe for the development of nickel-iron sulfide catalyst is of self-evident importance. Works based on post-catalysis characterization have led to the assumption that the real active species are nickel-iron oxyhydroxide, and that nickel-iron sulfide acts only as a precatalyst. However, the effects of low valence sulfur (S 2−) and metal species on OER in binary nickel-iron sulfide have rarely been systematically studied. Studies on the reductive capacity of the FeS and the long term stability of the TcO 4 −−FeS reaction product under both anaerobic and aerobic environments shows the potential utility of the in situ gaseous (hydrogen sulfide gas) immobilization technology in solidification of TcO 4 − by creating a FeS permeable reaction barrier in the vadose zone.Nickel-iron sulfide has shown attractive activity in electrocatalytic oxygen evolution reaction (OER). The TcO 4 −−FeS reductive immobilization reaction product was characterized by X-ray absorption near edge spectroscopy (XANES), extended X-ray absorption fine structure (EXAFS), Fourier transform infrared spectroscopy (FT-IR), and energy dispersive X-ray spectroscopy (EDS) and found to be predominantly TcO 2. The TcO 4 −−FeS reaction is consistent with a surface mediated reaction through ligand exchange. At pH values below the pH pzc, the positively charged FeS surface reacted much faster with TcO 4 − and had higher immobilization yields relative to the negatively charged FeS surface at pH values above pH pzc. The reductive immobilization of TcO 4 − with FeS was shown to be accelerated by increasing ionic strength and strongly pH dependent. Solubility studies of FeS in various buffers indicated that in the pH range 6.1–9.0, the concentrations of dissociated Fe 2+ and S 2− were negligible. The amorphous iron sulfide (FeS) was shown to have an elemental composition of FeS 0.97 for all of the size fractions and a point of zero charge of pH pzc=7.4. The reduction of pertechnetate (TcO 4 −) with freshly prepared amorphous iron sulfide was investigated.
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