Reduced anodic energy depletion in electrolysis by urea and water co-oxidization on NiFe-LDH: Activity origin and plasma functionalized strategy

Self-Supported Spray-Coated NiFe-LDH Catalyst on a Stainless Steel Substrate for Efficient Oxygen Evolution Reaction

“…With the application of a voltage prior to the reaction potential (0.2 V), there is an increase in the visibility of the phases and a shift of the peaks toward higher wavenumbers (462.5, 532.6, 669.2, 703.4 cm –1 , respectively), due to modifications in the vibrational modes upon voltage application . At a voltage of 0.6 V, the OER onset transformation potentials have already been overcome, demonstrating a clear transformation to γ-NiOOH at 481 and 558.5 cm –1 . ,,, It is well documented that nickel oxyhydroxides are highly active when mixed with significant amounts of iron species, indicating that the catalyst undergoes appropriate chemical transformations to develop the OER.…”

“…21 At a voltage of 0.6 V, the OER onset transformation potentials have already been overcome, demonstrating a clear transformation to γ-NiOOH at 481 and 558.5 cm −1 . 21,33,41,42 It is well documented that nickel oxyhydroxides are highly active when mixed with significant amounts of iron species, 43 indicating that the catalyst undergoes appropriate chemical transformations to develop the OER.…”

Fluorinated Ni‐O‐C Heterogeneous Catalyst for Efficient Urea‐Assisted Hydrogen Production

“…[ 33 ] For NiO/Ni@C, the phase angle in the low‐frequency region is stable in the potential range of 1.26 ≈ 1.34 V and exhibit sharp drop when the given potential is over 1.36 V. This is consistent with the tendency that is observed in the intermediate‐frequency region, further revealing that UOR were commenced due to the accumulation of intermediates (Figure S27a, Supporting Information). [ 34 ] In sharp contrast, the phase angle for F‐NiO/Ni@C drops drastically in the low‐frequency region while remaining relatively stable in the mid‐frequency region (1.26 ≈ 1.34 V). This observation indicates that UOR occurs via a direct electron transfer pathway, [ 34 ] highlighting the unique catalytic properties of our F‐NiO/Ni@C composite.…”

2D layered double hydroxides and transition metal dichalcogenides for applications in the electrochemical production of renewable hydrogen

“…168 In addition, their activity has been enhanced with a plasma functionalisation approach. 169 The nature of the intercalation anions seems to be relevant, with NO 3 À intercalants in a NiCo-LDH giving the greatest activity and selectivity for the urea oxidation reaction. 170 Another interesting approach is the use of bio-derived alcohols as the oxidation half-reaction in the formation of H 2 .…”