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Rational designed cost-effective material is significant in the field of electric energy storage and microwave absorber. In this work, carbon coated Fe 3 C nanoparticles (NPs) encapsulated carbon nanotubes (Fe 3 C@C@CNTs) is delicately constructed through in-situ chemical vapor deposition (CVD) strategy. As a promising anode material for lithium-ion batteries (LIBs), the Fe 3 C@C@CNTs nanocomposite facilitates electron transport with intensive interfacial interaction, making it an ideal prototype to thoroughly understand the mechanisms of interatomic charge transfer mechanism. As a result, this well-designed Fe 3 C@C@CNTs anode exhibits a high reversible capacity of 1027 mAh g−1 after 150 cycles at 0.1 A g−1 and excellent cycling stability with 71 % capacity retention at 519 mAh g−1 after 1000 cycles at 1.0 A g−1. Electrochemical kinetic results confirm that the pseudocapacitance contributions reach up to 90.1 % at 1.0 mV s−1, and the higher pseudocapacitance characteristic is ascribed to the multi-dimensional encapsulated by CNT layer and carbon layer. Meanwhile, depending on the peculiar cavity structure and heterogeneous interfaces effects constructed by multi-dimensional encapsulated structure, the minimum reflection loss (RL min) of Fe 3 C@C@CNTs nanocomposite can reach up to −67.63 dB in effective absorption bandwidth (EAB) of 7.12 GHz with the optimal matching thickness of 2.28 mm, suggesting its extensive potential application as practical alternative absorber. This domain-limited growth strategy opens a new horizon to achieve multi-functional application and beyond for Fe-based nanomaterial. [Display omitted] • Fe 3 C@C@CNTs is prepared by in-situ chemical vapor deposition method. • The multi-dimensional encapsulated structure can maintain electrochemical activity and increase electronic transmission path. • The heterogeneous interfaces can provide abundant active sites for lithium-ion storage and induce significant interfacial polarization for electromagnetic wave attenuation. [ABSTRACT FROM AUTHOR]

Ruthenium phosphides are promising candidates to substitute platinum (Pt) for electrocatalytic hydrogen evolution reaction (HER) but further boosting their activity is a tremendous challenge. Herein, crystalline/amorphous Ru@RuP core-shell nanoparticle supported on carbon nanotube (Ru@RuP-CNT) was synthesized by controllable surface phosphatization procedure. The resulted Ru@RuP-CNT outperforms its Ru-based rivals and Pt/C catalyst in HER, exhibiting a tiny overpotential of 28 mV at 10 mA cm−2 and marvelous mass activity of 3.24 A mg−1 at 50 mV overpotential in alkaline solution. Further investigations show that electronic interaction between metallic Ru core and amorphous RuP shell tunes the absorption strength of hydrogen to boost the HER activity. This work exemplifies an effective strategy to enhance the electrocatalytic performance via interfacial electronic interaction and may shed light on crystalline/amorphous heterostructured catalysts. [Display omitted] [ABSTRACT FROM AUTHOR]