Pentanediols (1,2-pentanediol and 1,5-pentanediol) are important feedstock for synthesis of fine chemicals, production of which from the biomass-derived furfural or furfuryl alcohol (FA) has been considered as a sustainable route and attracted much interest. In this study, the catalysts with Ni–Fe as the metal sites and Mg–Al layered double hydroxides (LDH) as precursor of support were synthesized. The results showed that the presence of Fe in catalyst affected both the development of the pores of the catalyst and the catalytic behaviors of nickel species. A low Fe content facilitated formation of mesoporous structure, but the higher content destroyed the LDH structure, resulting in a decreased surface area. Fe could also react with metallic Ni to form NiFe alloy. This decreased the catalytic activity for the further hydrogenation of the furan ring in FA, and FA would thus have the chance to produce pentanediols via hydrogenolysis . The In-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy characterization of hydrogenation of FA indicated that the alloying between Fe and Ni resulted in a weak adsorption of C C group in furan ring and moderate adsorption of C–O–C group, which suppressed the complete hydrogenation of FA while facilitated the ring-opening of FA to form the pentanediols.
Promoting the self-reconstruction of NiFe-based catalysts represents a promising approach to facilitate seawater splitting, albeit with significant challenges. Herein, the redox cycle of Ni species is subtly regulated by decorating NiFe hydroxides with vanadium. Both experimental and theoretical studies demonstrate that the incorporation of V boosts the self-reconstruction of NiFe hydroxides and allows a superior OER performance on account of diminished propensity for chlorine adsorption and optimized binding energy of oxygen-containing intermediates. Consequently, the NiFeV/NF catalyst delivers 2.0 A cm −2 at an ultralow overpotential of 369 mV in 1.0 M KOH and exhibits exceptional stability for 720 h at 20 A in an alkaline membrane electrode assembly (MEA) electrolyzer . In alkaline seawater , it achieves prolonged stability, surpassing 240 h at 500 mA cm −2 with OER selectivity of 99 %. This work significantly advances the field of seawater electrolysis powered by marine renewables, paving the way for on-site hydrogen production .
Electrochemical water splitting for hydrogen production is currently constrained by the sluggish kinetics of the anodic oxygen evolution reaction (OER). NiFe-based catalysts have emerged as promising alternatives to precious metal OER catalysts due to their low cost and relatively high electrocatalytic activity. However, NiFe-based catalysts prepared by conventional synthesis methods suffer from a low density of exposed active sites and ambiguous structures. Herein, we report a straightforward solution-thermal strategy for constructing two-dimensional sub-1 nm nanosheets (SNSs) through the self-assembly of an iron-substituted polyoxometalate (FeMo 6 ) cluster with Ni 3 S 2 . The Ni 3 S 2 –FeMo 6 SNSs exhibit excellent electrocatalytic performance in 1 M KOH, achieving an overpotential of only 342 mV at a current density of 100 mA cm −2 and maintaining stability for 100 h at 10 mA cm −2 . The synergistic effect between Fe and Ni 3 S 2 effectively modulates the electronic structure of the catalyst, accelerating the formation of the active NiOOH phase. Furthermore, Fe incorporation actively enhances hydroxyl groups adsorption on the catalyst surface and facilitates lattice oxygen participation in the reaction. This work clarifies the role of Fe in NiFe-based electrocatalysts, providing new perspectives for developing facile-to-synthesize and high-performance electrocatalysts.
危险品化学品经营许可证（带存储）