Fabrication of Ni‐Fe LDH/GF anode for enhanced Fe(III) regeneration in fuel cell‐assisted chelated‐iron dehydrosulfurization process

Abstract

BACKGROUND: The incorporation of an air-cathode fuel cell into the chelated iron dehydrosulfurization process realizes simultaneous recovery of electricity and elemental sulfur from H 2 S. However, the slow oxidation kinetics of chelated Fe(II) in the fuel cell limits the efficiency of such a process.

The impact of ultrasonic parameters on the exfoliation of NiFe LDH nanosheets as electrocatalysts for the oxygen evolution reaction in alkaline media

“…3 A , the broad bands observed around 3300–3500 cm −1 can be allocated to the O–H stretching vibrations in the brucite-like layers [27] . The 2185 cm −1 band can be assigned to the C-O vibrations emanating from the CO 3 2– anions [28] . The 1621 cm −1 band can be attributed to vibrations of the cohering H 2 O molecules [58] .…”

“…The 1621 cm −1 band can be attributed to vibrations of the cohering H 2 O molecules [58] . The 1345 cm −1 band belong to the intercalated CO 3 2– anions vibrations [28] , [58] . The presence of the intrinsic stretching vibrations of Fe-O, Ni-O and Ni-O-Fe bonds in all NiFe LDH materials are confirmed by the characteristic peaks between 400 and 700 cm −1 ( Fig.…”

“…The initial synthesized NiFe LDH materials possess stacked nanosheets that limited exposure of catalytically active sites. However, the most researches are focused on incorporating carbon materials with NiFe LDH to elevate charge transfer kinetics and further improve the catalytic activity [26] , [27] , [28] . Obviously, the lack of attention is paid to the expansion of active sites or intrinsic activity of the NiFe LDH electrocatlyst.…”

Impact of cation redox chemistry on continuous hydrothermal synthesis of 2D-Ni(Co/Fe) hydroxides

“…In contrast, the synthesis of NiFe LDHs does not require manipulating the oxidation states of the cations due to the higher stability of Fe 3+ (aq) compared to Co 3+ (aq) . Typical approaches consist of both hydrothermal synthesis [8,10,26] and coprecipitation processes [21][22][23]27] where Ni 2+ (aq) and Fe 3+ (aq) are slowly added to a OHsolution containing the desired intercalating anion.…”

“…Similarly to the hydrothermal synthesis of NiCo LDH, the product is collected after several hours as a result of the slow dropwise addition and/or ageing of the mixed solution [8,9,21,22,26,27].…”