A fourteen-component high-entropy alloy@oxide bifunctional electrocatalyst with a record-low ΔE of 0.61 V for highly reversible Zn–air batteries

Abstract

Nanostructured high-entropy materials such as alloys, oxides, etc., are attracting extensive attention because of their widely tunable surface electronic structure/catalytic activity through mixing different elements in one system. To further...

Regulating the coordination environment of Fe/Co–N/S–C to enhance ORR and OER bifunctional performance

“…Among them, electrochemical energy conversion equipment, including proton exchange membrane fuel cells (PEMFCs) and metal-air batteries, has been considered efficient and practical options. [1][2][3][4][5][6][7][8][9][10][11] In these devices, high-performance electrocatalysts at the cathodes are necessary to speed up the oxygen reduction reaction (ORR) or the oxygen evolution reaction (OER) to practical reaction rates. The perfect implementation of the ORR's four-electron reaction process remains a challenge, where the *OH + H + + e − → H 2 O step in the ORR is the rate-determining step (RDS).…”

Dynamic-self-catalysis as an accelerated air-cathode for rechargeable near-neutral Zn–air batteries with ultrahigh energy efficiency

“…29,30 Region II is marked by flat discharge/charge voltage plateaus, corresponding to the ORR and OER features, typical of the regular ZABs. 31 Importantly, the DSC-ZAB exhibits smaller voltage polarizations than the regular-bare-ZAB, suggesting that the kinetics of the ORR and OER are both accelerated in the DSC-ZAB. The voltage gap between charge and discharge in Region II of the DSC-ZAB is only 0.88 V, which is also smaller than that of regular-ZAB(Pt/C + IrO 2 ) (1.04 V), demonstrating that the oxygen electrocatalysis in the DSC-ZAB is more efficient than that of the This journal is © The Royal Society of Chemistry 2023 benchmark preloaded catalysts.…”

Designing strategies and enhancing mechanism for multicomponent high-entropy catalysts

“…Moreover, the element compositions of both the HEO support and the noble metal nanocluster can be easily tuned, which will be used for developing more advanced and multifunctional catalysts with high durability considering that both the HE-support and the nanoclusters are catalytically active. 71 2.3.2 HEM/carbon composite. Multicomponent highentropy materials could be thermodynamically stable or metastable in the preparation process.…”