02263nas a2200217 4500008004100000022001400041245014400055210006900199260000800268490000700276520145500283653002101738653000801759653002401767653002701791100002101818700002001839700002401859700003101883856013101914 2025 eng d a1613-681000aSynthesis framework for designing PtPdCoNiMn high-entropy alloy: a stable electrocatalyst for enhanced alkaline hydrogen evolution reaction0 aSynthesis framework for designing PtPdCoNiMn highentropy alloy a cJAN0 v213 a

High entropy alloys (HEAs) are an emerging class of advanced materials characterized by their multifunctionality and potential to replace commercial catalysts in electrocatalytic water splitting. The synergy among the various alloyed elements in HEAs makes them particularly promising for applications in electrocatalysis. However, preparation of HEA via bottom-up approaches by avoiding the formation of mono, di, and tri metallic alloys in the nanoscale is challenging. This aspect is addressed, in this study by exploring the logical selection of solvents, reducing agents, and capping agents, along with their relative fractions, in the solvothermal synthesis of the HEA comprising platinum-palladium-cobalt-nickel-manganese (PtPdCoNiMn). It is established that the reducing capabilities of both the solvent and reducing agent are crucial for the reduction of each metal to form a single-phase HEA. The synthesized HEA (20 wt.%)/functionalized carbon (FC) demonstrates excellent performance as an HER catalyst, exhibiting a low overpotential of 48.7 mV at -10 mA cm-2 in an alkaline electrolyte. This performance is characterized by high reaction kinetics and stability at elevated current densities. Furthermore, the catalyst shows impressive performance in both simulated and actual seawater. This development reduces the reliance on platinum while enhancing the long-term durability and catalytic efficiency of the electrocatalyst.

10aelectrocatalysts10aHER10ahigh entropy alloys10asolvothermal synthesis1 aChandran, Athira1 aSahoo, Sudeshna1 aSingh, Ashutosh, K.1 aPrasad, Bhagavatula, L. V. uhttps://library.ncl.res.in/content/synthesis-framework-designing-ptpdconimn-high-entropy-alloy-stable-electrocatalyst-enhanced