TY - JOUR
T1 - Self-Templating Engineering of Hollow N-Doped Carbon Microspheres Anchored with Ternary FeCoNi Alloys for Low-Frequency Microwave Absorption
AU - Li, Luwei
AU - Ban, Qingfu
AU - Song, Yuejie
AU - Liu, Jie
AU - Qin, Yusheng
AU - Zhang, Tiantian
AU - Kong, Jie
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2024/12/12
Y1 - 2024/12/12
N2 - Rational design and precision fabrication of magnetic-dielectric composites have significant application potential for microwave absorption in the low-frequency range of 2–8 GHz. However, the composition and structure engineering of these composites in regulating their magnetic-dielectric balance to achieve high-performance low-frequency microwave absorption remains challenging. Herein, a self-templating engineering strategy is proposed to fabricate hollow N-doped carbon microspheres anchored with ternary FeCoNi alloys. The high-temperature pyrolysis of FeCoNi alloy precursors creates core-shell FeCoNi alloy-graphitic carbon nano-units that are confined in carbon shells. Moreover, the anchored FeCoNi alloys play a critical role in maintaining hollow structural stability. In conjunction with the additional contribution of multiple heterogeneous interfaces, graphitization, and N doping to the regulation of electromagnetic parameters, hollow FeCoNi@NCMs exhibit a minimum reflection loss (RLmin) of −53.5 dB and an effective absorption bandwidth (EAB) of 2.48 GHz in the low-frequency range of 2–8 GHz. Furthermore, a filler loading of 20 wt% can also be used to achieve a broader EAB of 5.34 GHz with a matching thickness of 1.7 mm. In brief, this work opens up new avenues for the self-templating engineering of magnetic-dielectric composites for low-frequency microwave absorption.
AB - Rational design and precision fabrication of magnetic-dielectric composites have significant application potential for microwave absorption in the low-frequency range of 2–8 GHz. However, the composition and structure engineering of these composites in regulating their magnetic-dielectric balance to achieve high-performance low-frequency microwave absorption remains challenging. Herein, a self-templating engineering strategy is proposed to fabricate hollow N-doped carbon microspheres anchored with ternary FeCoNi alloys. The high-temperature pyrolysis of FeCoNi alloy precursors creates core-shell FeCoNi alloy-graphitic carbon nano-units that are confined in carbon shells. Moreover, the anchored FeCoNi alloys play a critical role in maintaining hollow structural stability. In conjunction with the additional contribution of multiple heterogeneous interfaces, graphitization, and N doping to the regulation of electromagnetic parameters, hollow FeCoNi@NCMs exhibit a minimum reflection loss (RLmin) of −53.5 dB and an effective absorption bandwidth (EAB) of 2.48 GHz in the low-frequency range of 2–8 GHz. Furthermore, a filler loading of 20 wt% can also be used to achieve a broader EAB of 5.34 GHz with a matching thickness of 1.7 mm. In brief, this work opens up new avenues for the self-templating engineering of magnetic-dielectric composites for low-frequency microwave absorption.
KW - FeCoNi alloys
KW - hollow carbon microspheres
KW - impedance matching
KW - magnetic-dielectric synergy
KW - microwave absorption
UR - http://www.scopus.com/inward/record.url?scp=85205271130&partnerID=8YFLogxK
U2 - 10.1002/smll.202406602
DO - 10.1002/smll.202406602
M3 - 文章
C2 - 39344537
AN - SCOPUS:85205271130
SN - 1613-6810
VL - 20
JO - Small
JF - Small
IS - 50
M1 - 2406602
ER -