Ultraviolet photoelectron spectroscopy and theoretical simulation confirmed that the alloying of Ni into Fe could well manipulate the electronic structure, leading to favorable intermetallic charge-transfer and then downshifting the d-band center of Fe adsorption sites, all of which help to significantly lower the reaction barriers of the involved intermediates during the electrocatalytic ORR/OER processes.Īs green and sustainable energy storage and supply system, rechargeable Zn-air batteries (ZABs) have received extensive attention and rapid developments in recent decades because of their excellent theoretical specific energy, low cost, and eco-friendly, thus suggesting promising practical applications in portable electronics and even future vehicles. ![]() Beyond that, a highly-efficient regenerative Zn-air battery was also successfully constructed, evidenced by a small potential gap of 0.664 V (between E j=10 and E 1/2), a high specific capacity of 763 mAh/g, a large peak power density of 270 mW/cm 2, and robust stability. The as-developed catalyst outperformed the commercialized noble-metal benchmarks with a decent half-wave potential of 0.891 V for ORR and a small overpotential of 325 mV at 10 mA/cm 2 for OER both in 0.1 M KOH solution. ![]() ![]() In this effort, the electronic-structure modulation strategy through nano-alloying was rationally designed to fabricate Fe-Ni alloy particles embedded in an N-doped carbon nanobox.
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