Ternary NiCoFe-layered double hydroxide hollow polyhedrons as highly efficient electrocatalysts for oxygen evolution reaction

Hollow CoFe-layered double hydroxide polyhedrons for highly efficient CO2 electrolysis

“…Some shoulder peaks corresponding to the satellite peaks of main peaks are also present. The co-existence of the redox pairs of Co 2+ /Co 3+ and Fe 2+ /Fe 3+ confirmed the LDH construction in CoFe-LDH/HP [39,40].…”

“…The CoFe-LDH/HP electrocatalysts were synthesized by in situ etching of self-templated metal-organic frameworks (MOFs) to form hollow structures with simultaneous generation of LDHs, according to the procedure mentioned in our previous reports [39,40] and the schematic illustration of the preparation process is shown in Fig. 1a High-resolution TEM (HRTEM) image reveals the lattice fringes with an interplanar distance of 0.25 nm, which is indexed to the d-spacing of the (009) plane of CoFe LDH (Fig.…”

In-situ optimizing the valence configuration of vanadium sites in NiV-LDH nanosheet arrays for enhanced hydrogen evolution reaction

“…For in -NiV-LDH/NF, as indicated in Fig. 4 (a), two strong peaks located at 856.06 and 873.64 eV belong to the typical features of Ni 2 p , accompanied by a spin energy separation of ~17.6 eV between them [31] , corresponding to the spin-orbit splitting of Ni 2 p orbital containing Ni 2 p 3/2 and Ni 2 p 1/2 respectively, together with two vibration satellite peaks at 862.06 eV and 879.91 eV [32] . It is noticeable that the XPS spectra of Ni 2 p in ex -NiV-LDH/NF show the identical characteristic as in -NiV-LDH/NF ( Fig.…”

Topotactically constructed nickel–iron (oxy)hydroxide with abundant in-situ produced high-valent iron species for efficient water oxidation

“…Among the various studied low-cost OER catalysts, NiFe-based (oxy)hydroxide materials show excellent catalytic activities [9][10][11][12][13][14][15]. Previous studies have evidenced that the water oxidation is usually proceeded via the nucleophilic attack of water molecule or hydroxide ions on the high-valent Fe or Ni center (such as Fe 4+ or Ni 4+ ) over NiFe (oxy)hydroxides during OER [16][17][18][19].…”