Electrocatalytic activity of high-entropy alloys toward oxygen evolution reaction

Abstract

Abstract

High-entropy energy materials: challenges and new opportunities

“…For instance, the large lattice strain in the HEAs is beneficial to the absorption of hydrogen in both octahedral and tetrahedral sites, providing great potential for hydrogen energy applications. 10,[28][29][30] Sluggish diffusion effects lead the alloys to develop nanocrystalline or even amorphous structures, which is promising for electrocatalysis, including methanol oxidation 31,35,62,63 or oxygen evolution 39,41,44,46,47 and reduction. 31,52,64 Overall, HEAs can be regarded as atomicscale composites, since multiprinciple metals are incorporated and the interactions among the different elements are playing an important role, 8,27,59 resulting in a kind of composite (cocktail) effect on properties.…”

“…Some noble-metal-free HEAs, such as FeNiMnCrCu, 44 FeCoNiCrAl, 44 CoCrFeMnNi, 47 FeCoNiMn 37 and AlCoNiFeX (X = Nb, Mo, Cr), 41,46 were studied in an alkaline environment, showing great potential for future applications as OER electrocatalysts. Qiu et al 41 synthesized several nanoporous AlCoNiFeX (X = Nb, Mo, Cr, V, Zr, Mn, Cu)-based HEAs that have a high-entropy (oxy)hydroxide surface.…”

“…Note that lattice distortions are commonly developing in highentropy alloys (HEAs) 5,8,9,26,27 and are supportive to gas absorption due to the formation of more suitable reaction sites, leading to promising properties, especially for hydrogen storage. 10,[28][29][30] The strong synergistic effects among the functional units are beneficial to the catalysis of energy conversion processes, boosting the investigation of high-entropy noblemetal and noble-metal-free electrocatalysts in methanol oxidation [31][32][33][34][35][36] as well as oxygen evolution 25,[37][38][39][40][41][42][43][44][45][46][47] and reduction. 31,32,45,46,[48][49][50][51][52] In the battery field, HEMs also exhibit attractive properties.…”

Kinetically-controlled laser-synthesis of colloidal high-entropy alloy nanoparticles

“…High-entropy alloys (HEAs) have evolved to one of the most popular material classes in the last decades in both fundamental and applied material science. [1][2][3] Unique mechanical, [4][5][6] electromagnetic, [7][8][9] and electrochemical [10][11][12] properties originate from their multi-elemental, solid-solution character. However, research has been focused primarily on bulk HEA, ignoring HEA nanoparticles (NPs), due to the absence of a reliable, scalable, and straightforward synthesis method for HEA NPs.…”

Mechanochemical synthesis of novel rutile-type high entropy fluorides for electrocatalysis

“…18 Due to their special electronic configuration and surface complexity, HEMs are in general expected to provide desirable electrocatalytic properties. 33,34 In the present work, we detail the synthesis and an in-depth characterization of multi-cationic (with 4 to 7 cations) composed rutile (P4 2 /mnm) structured medium-(4 cations) and high-entropy (5-7 cations) fluorides (MEF and HEFs, respectively).…”