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Fe doping-regulated electron transfer and Co d-band center: boosting ORR/OER catalysis of Co@NCNTs for stable zinc-air batteries

delete2026-04-28
delete0
PRE
AI
Q
Qihao Wu
刘
刘霞 (Xia Liu)
Y
Yuying Feng
C
Chunyan Wu
X
Xingwei Zhao
F
Feng Wen
G
Guan‐Cheng Xu
L
Li Zhang
H
Hao Jiang
X
X. Sun
DOI：10.1039/D6TA02165Ddelete
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Abstract

Abstract

En 中文
Improving the performance and durability of transition metal and nitrogen-doped carbon (TM/N-C) composite catalysts is crucial for the efficient operation of zinc-air batteries (ZABs). In this work; a catalyst of Fe-doped Co nanoparticles and N-doped carbon nanotubes (denoted as Fe-Co@NCNTs-5) grown on carbon cloth (CC) was developed. Co3O4 particles derived from the cobalt formate framework (Co-FF) were uniformly anchored on the CC surface; and the resulting assembly served as a high-quality precursor for subsequent high-temperature calcination with dicyandiamide and ferrocene at a specific ratio to obtain an integrated self-supporting electrode material. The Fe-Co@NCNTs-5 catalyst exhibited considerable advantages in the bifunctional catalysis of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). In an alkaline medium; the half-wave potential (E1/2) for the ORR reached 0.87 V (vs. RHE); while the overpotential for the OER at a current density of 10 mA cm–2 was only 250 mV (vs. RHE). Density-functional theory (DFT) calculations demonstrated that Fe doping enhances electron transfer at the catalyst-carrier interface; optimizes the d-band center of Co; and reveal the energy barrier of catalytic reactions; thereby substantially improving its ORR and OER catalytic performance. Liquid and flexible ZABs assembled with this catalyst achieved peak power densities of 180.0 mW cm–2 and 96.9 mW cm–2; respectively. Both types of batteries showed superior rate performance and cycling stability compared to those assembled with commercial Pt/C and RuO2. This study provides a novel strategy for the synthesis of composite bifunctional carbon materials for ZABs.
Keywords:
Fe doping
Co@NCNTs
ORR/OER catalysis
zinc-air batteries
d-band center

Journal

J
j. mater. chem. a
IF:
0
Papers:
1.6K
Citations:
0

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