Effect of the annealing temperature of multi-elemental oxides (FeCoNiCuZn)yOx on the electrocatalytic hydrogenation of nitrobenzene at room temperature

High entropy alloying strategy for accomplishing quintuple-nanoparticles grafted carbon towards exceptional high-performance overall seawater splitting

“…As the literature suggests, oxygen is present in different locations in a sample – oxygen atoms in the lattice (O L ) (∼530 eV), 31 oxygen atoms in the vicinity of an oxygen vacancy (O v ) at ∼531 eV, 31 oxygen atoms on the outer face of the lattice structure (O s ) with a lower coordination number at ∼532 eV, 31 and oxygen species adsorbed (O ads ) which may be due to the adsorption of water from the environment, located at ∼533 eV. 31 Interestingly, we observe as the temperature increases from 500 °C to 1000 °C, that there is an intensification of O s peaks. Among these, O s peaks always occupy the major contribution which once again signifies the presence of surface functionalities.…”

“…It is evident from numerous reports that such oxygen is beneficial in inducing defects in the system and enhancing the overall catalytic activity by favoring the preferred reaction sites for specific intermediates. 31…”

“…This change in metal concentration is due to the loss of segregated phases of all elements due to evaporation at higher temperatures, which favors alloy formation. 31 By analyzing the wide spectra of all three samples, we can see distinct oxide peaks, representing the oxidation of the sample during handling and material synthesis (Fig. S5, ESI †).…”

“…Recently some unique HEAs have been developed for various applications – Pt 18 Ni 26 Fe 15 Co 14 Cu 27 for methanol oxidation through a one-pot oil phase method, 27 AlFeMnTiM (M = Cr, Co, Ni) for efficient degradation of azo dyes 28 – and disordered CoCuGaNiZn, AgAuCuPdPt HEAs and AuAgPtPdCu predicted through DFT, have been developed experimentally for carbon dioxide reduction catalysis with outstanding performance and high turnover frequency. 29,30 In addition, FeCoNiCuZn oxide-based multi-metal alloy has been fabricated recently via a urea-based aqueous solution method for nitrobenzene electrocatalytic reduction; 31 in a similar vein, a highly efficient HER catalyst based on Ni 20 Fe 20 Mo 10 Co 35 Cr 15 has also been reported recently with excellent corrosion resistance in both acidic and basic reactions. 32 These findings indicate the high prospect and potential of such alloy systems for evolving into exemplary catalysts.…”

First‐Principles Density Functional Theory and Machine Learning Technique for the Prediction of Water Adsorption Site on PtPd‐Based High‐Entropy‐Alloy Catalysts

“…High‐entropy alloys (HEAs), the alloys containing at least 4 elements with configurational entropy of mixing ≥1.36R, [ 1 ] have been suggested to hold a high potential for applications in catalytic engineering. [ 2,3 ] They are currently studied in several reactions such as CO 2 (CO) reduction reaction, [ 4–6 ] alcohol oxidation reaction, [ 7 ] N 2 reduction reaction, [ 8,9 ] hydrogenation of nitrobenzene, [ 10,11 ] oxygen evolution reaction, [ 12 ] oxygen reduction reaction, [ 13–16 ] and hydrogen evolution reaction. [ 17,18 ] The reason behind the wide application is four‐core effects, [ 19 ] where the cocktail effect plays a significant role in electronic properties, influencing catalytic properties directly.…”