Ultra-small and highly dispersive iron oxide hydroxide as an efficient catalyst for oxidation reactions: a Swiss-army-knife catalyst

Abstract

Ultra-small and highly dispersive (< 10 nm) iron oxide hydroxide is characterized by some methods. The compound is an efficient and stable catalyst for alcohol oxidation, organic sulfide oxidation, and epoxidation of alkenes in the presence of H2O2. The electrochemical oxygen-evolution reaction of the iron oxide hydroxide is also tested under acidic, neutral, and alkaline conditions. In the presence of the iron oxide hydroxide, excellent conversions (75–100%) and selectivities of substrates (92–97%), depending on the nature of the sulfide, were obtained. Benzylalcohols having electron-donating and-withdrawing substituents in the aromatic ring were oxidized to produce the corresponding aldehydes with excellent conversion (65–89%) and selectivity (96–100%) using this iron oxide hydroxide. The conversion of styrene and cyclooctene toward the epoxidation in the presence of this catalyst are 60 and 53%, respectively. Water oxidation for the catalysts was investigated at pH 2, 6.7, 12, and 14. The onset of OER at pH 14 is observed with a 475 mV overpotential. At 585 mV overpotential, a current density of more than 0.18 mA/cm2 and a turnover frequency of 1.5/h is observed. Operando high-resolution visible spectroscopy at pH 14, similar to previously reported investigations, shows that Fe(IV)=O is an intermediate for water oxidation.

Greenly Reduced CoFe‐PBA/Nickel Foam: A Robust Dual Electrocatalyst for Solar‐Driven Alkaline Water Electrolysis with a Low Cell Voltage

“…Post‐XRD analysis demonstrates that the generation of new active phases occur exclusively on the surface of the rCoFe‐PBA/NF, rather than throughout the catalyst. The post‐IR spectra of rCoFe‐PBA/NF (Figure S7) shows new peaks at 890 cm −1 (M−OOH), 1356 cm −1 (H 2 O‐bending) and 1635 cm −1 and 3000–3500 cm −1 corresponds to −OH [68–73,36] . The post‐IR spectrum analysis implying a phase transition from rCoFe‐PBA/NF to oxyhydroxides formation which is in agreement with post‐XRD results.…”

“…45‐0031) [75] . The post‐IR spectra (Figure S11) of rCoFe‐PBA/NF shows new peaks at 890 cm −1 (M−OH), 1356 cm −1 (H 2 O‐bending) and 1635 cm −1 and 3000–3500 cm −1 corresponds to −OH [68–73,36] . The post‐IR spectrum analysis implying transition from rCoFe‐PBA/NF to metal and metal hydroxides formation which is in agreement with post‐XRD results.…”

“…[67] The potential activity of rCoFe-PBA/NF reveals that the active S7) shows new peaks at 890 cm À 1 (MÀ OOH), 1356 cm À 1 (H 2 O-bending) and 1635 cm À 1 and 3000-3500 cm À 1 corresponds to À OH. [68][69][70][71][72][73]36] The post-IR spectrum analysis implying a phase transition from rCoFe-PBA/NF to oxyhydroxides formation which is in agreement with post-XRD results.…”

Soft synthesis and characterization of goethite-based nanocomposites as promising cyclooctene oxidation catalysts

“…In contrast, in the case of Mn-doped cerium oxide catalysts, the reaction conditions involve high energy consumption. Until now, iron oxide hydroxide (FeOOH) was used as an efficient catalyst only for alcohol oxidation, organic sulfide oxidation, and epoxidation of alkenes in the presence of H 2 O 2 73 while the catalytic activity of FeOOH based nanocomposites containing MnO(OH), Co(OH) 2 , Ni(OH) 2 , CuO or ZnO in the epoxidation of cyclooctene with molecular oxygen has not been reported. Such catalytic systems could present interest since their synthesis is not difficult and does not imply high costs.…”

Enhancing the catalytic OER performance of MoS2 via Fe and Co doping

“…[44][45][46] On the other hand, the iron-based catalysts advantages are their reaction intermediates, Fe-hydroxides/ oxides, that can serve as the active species for catalytic reactions. 47,48 Recent studies have shown that transition metal doping such as Fe, Co, and Ni alters the electronic structure and improves the conductivity and electrochemical properties of MoS 2 . [49][50][51][52][53][54][55][56][57] However, only a few works were reported on transition metals incorporated MoS 2 for the OER activity.…”