TY - JOUR
T1 - Highly accessible atomically dispersed FeNx sites coupled with Fe3C@C core-shell nanoparticles boost the oxygen catalysis for ultra-stable rechargeable Zn-air batteries
AU - Srinivas, Katam
AU - Chen, Zhuo
AU - Ma, Fei
AU - Chen, Anran
AU - Zhang, Ziheng
AU - Wu, Yu
AU - Zhu, Ming qiang
AU - Chen, Yuanfu
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/10/15
Y1 - 2023/10/15
N2 - It is significant but challenging to develop a cost-effective, high-efficiency, and stable bifunctional electrocatalyst of oxygen reduction and evolution reactions (ORR and OER) for rechargeable Zn-air batteries. Herein, we present a novel bifunctional catalyst constructed by highly accessible atomically dispersed MNx sites coupled with core-shell nanoparticles (M-Phen-800; M = Fe, Co, and Ni) from easily accessible M-Phenanthroline (M-Phen) complexes. Due to the synergistically induced symmetric charge distribution around FeNx sites by Fe3C@C core-shell nanoparticles, Fe-Phen-800 exhibits exceptional onset (Eonset = 0.994 V) and half-wave (E1/2 = 0.878 V) potentials for ORR and a very low overpotential of 285 mV @ 10 mA cm−2 (Ej=10) for OER, indicating excellent bifunctional activity (ΔE = Ej=10 - E1/2 = 0.637 V) over the state-of-the-art Pt/C-RuO2 (0.702 V) combination. Moreover, the Fe-Phen-800-based Zn-air battery demonstrates a remarkable energy density of 1022 Wh kg−1 and greater cycling stability (>800 cycles) than the commercial Pt/C-RuO2 battery.
AB - It is significant but challenging to develop a cost-effective, high-efficiency, and stable bifunctional electrocatalyst of oxygen reduction and evolution reactions (ORR and OER) for rechargeable Zn-air batteries. Herein, we present a novel bifunctional catalyst constructed by highly accessible atomically dispersed MNx sites coupled with core-shell nanoparticles (M-Phen-800; M = Fe, Co, and Ni) from easily accessible M-Phenanthroline (M-Phen) complexes. Due to the synergistically induced symmetric charge distribution around FeNx sites by Fe3C@C core-shell nanoparticles, Fe-Phen-800 exhibits exceptional onset (Eonset = 0.994 V) and half-wave (E1/2 = 0.878 V) potentials for ORR and a very low overpotential of 285 mV @ 10 mA cm−2 (Ej=10) for OER, indicating excellent bifunctional activity (ΔE = Ej=10 - E1/2 = 0.637 V) over the state-of-the-art Pt/C-RuO2 (0.702 V) combination. Moreover, the Fe-Phen-800-based Zn-air battery demonstrates a remarkable energy density of 1022 Wh kg−1 and greater cycling stability (>800 cycles) than the commercial Pt/C-RuO2 battery.
KW - Core-shell nanoparticle
KW - MN sites
KW - Oxygen reduction reaction
KW - Synergistic interactions
KW - Zn-air battery
UR - https://www.scopus.com/pages/publications/85159362642
U2 - 10.1016/j.apcatb.2023.122887
DO - 10.1016/j.apcatb.2023.122887
M3 - Article
AN - SCOPUS:85159362642
SN - 0926-3373
VL - 335
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 122887
ER -