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FeNC catalysts decorated with NiFe2O4 to enhance bifunctional activity for Zn–Air batteries
Rechargeable Zn–air battery is a promising next-generation energy storage device attributed to its high energy density, excellent safety, and low cost. However, its commercialization is hampered by sluggish kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at air electrodes. Herein, we have designed, fabricated, and demonstrated a highly efficient ORR/OER electrocatalyst, NiFe2O4/FeNC, using low-cost materials via a facile synthesis route. NiFe2O4 is successfully loaded on Fe/N-doped carbon (FeNC) through bonding to Fe3C in FeNC. Due to the existence of high ORR active sites such as FeN4 and Fe and N-doped carbon moieties, the half-wave potential of the ORR reaches a high value of 0.83 V. While benefited from NiFe2O4 with high OER activity and the synergistic effect between NiFe2O4 and FeNC, the overpotential is 310 mV at 10 mA cm–2 in the OER. The voltage difference between charging–discharging operations in the Zn–air battery employing the NiFe2O4/FeNC electrocatalyst only increases by 0.16 V after cycling for 100 h (600 cycles) at 10 mA cm–2, which is much lower than 1.28 V using the best commercial Pt/C and RuO2 catalysts.
Sustainable Hydrogen Production from Seawater Electrolysis
Engineering and Physical Sciences Research CouncilFind out more...
National Key Research and Development Program of China (2022YFE0202400)
Guangdong Science and Technology Department (2019B050510043)
Department of Science and Technology of Zhuhai City (ZH22017001200059PWC)
Royal Society and the Newton Fund (NAF\R1\191294)
- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering
Published inACS Applied Energy Materials
PublisherAmerican Chemical Society (ACS)
- AM (Accepted Manuscript)
Rights holder© American Chemical Society
Publisher statement© 2023 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaem.3c00942