Hierarchically porous Co/C nanocomposites for ultralight high-performance microwave absorption

Xie, Peitao; Liu, Yuan; Feng, Miaolin; Niu, Mang; Liu, Chun-Zhao; Wu, Nannan; Sui, Kunyan; Patil, Rahul; Pan, Duo; Guo, Zhanhu; Fan, Runhua

doi:10.1007/s42114-020-00202-z

Cited by 370 publications

(69 citation statements)

References 52 publications

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“…Then, the nickel ions are converted into metallic nickel nanoparticle catalysts accompanied by a fluid nitrogen atmosphere. Under the catalysis of the Ni nanoparticles, the carbon nitride nanostructures are decomposed into C–N groups and rearranged to form in situ bamboo-shaped graphitic CNTs [ 37 , 38 ]. Finally, the typical bamboo-like CNTs in which Ni particles are embedded on the top are formed in the surface and interlamination of each accordion-like MXene unit.…”

Section: Resultsmentioning

confidence: 99%

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

You

et al. 2021

Nano-Micro Lett.

123

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Highlights Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Compared with the traditional magnetic agglomeration, the MXene-CNTs/Ni hybrids exhibit the highly spatial dispersed magnetic architecture. 3D MXene-CNTs/Ni composites hold excellent microwave absorption performance (−56.4 dB at only 2.4 mm). Abstract Ti3C2Tx MXene is widely regarded as a potential microwave absorber due to its dielectric multi-layered structure. However, missing magnetic loss capability of pure MXene leads to the unmatched electromagnetic parameters and unsatisfied impedance matching condition. Herein, with the inspiration from dielectric-magnetic synergy, this obstruction is solved by fabricating magnetic CNTs/Ni hetero-structure decorated MXene substrate via a facile in situ induced growth method. Ni2+ ions are successfully attached on the surface and interlamination of each MXene unit by intensive electrostatic adsorption. Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Due to the improved impedance matching condition, the MXene-CNTs/Ni hybrid holds a superior microwave absorption performance of − 56.4 dB at only 2.4 mm thickness. Such a distinctive 3D architecture endows the hybrids: (i) a large-scale 3D magnetic coupling network in each dielectric unit that leading to the enhanced magnetic loss capability, (ii) a massive multi-heterojunction interface structure that resulting in the reinforced polarization loss capability, confirmed by the off-axis electron holography. These outstanding results provide novel ideas for developing magnetic MXene-based absorbers.

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Section: Resultsmentioning

confidence: 99%

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

You

et al. 2021

Nano-Micro Lett.

123

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“…With extensive deployment and development of electronic equipment and communication devices, serious electromagnetic interference (EMI) interrupts the functions of equipment and affects the human organs [1][2][3][4][5][6]. Recently, more efforts have been made to seek for novel lightweight and high-performance EMI shielding materials [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

et al. 2021

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Lightweight microcellular polyurethane (TPU)/carbon nanotubes (CNTs)/ nickel-coated CNTs (Ni@CNTs)/polymerizable ionic liquid copolymer (PIL) composite foams are prepared by non-solvent induced phase separation (NIPS). CNTs and Ni@CNTs modified by PIL provide more heterogeneous nucleation sites and inhibit the aggregation and combination of microcellular structure. Compared with TPU/CNTs, the TPU/CNTs/PIL and TPU/CNTs/Ni@CNTs/PIL composite foams with smaller microcellular structures have a high electromagnetic interference shielding effectiveness (EMI SE). The evaporate time regulates the microcellular structure, improves the conductive network of composite foams and reduces the microcellular size, which strengthens the multiple reflections of electromagnetic wave. The TPU/10CNTs/10Ni@CNTs/PIL foam exhibits slightly higher SE values (69.9 dB) compared with TPU/20CNTs/PIL foam (53.3 dB). The highest specific EMI SE of TPU/20CNTs/PIL and TPU/10CNTs/10Ni@CNTs/PIL reaches up to 187.2 and 211.5 dB/(g cm−3), respectively. The polarization losses caused by interfacial polarization between TPU substrates and conductive fillers, conduction loss caused by conductive network of fillers and magnetic loss caused by Ni@CNT synergistically attenuate the microwave energy.

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“…[3,26,30] Moreover, the small nanoparticles could be used as building blocks to construct electromagnetic composites, which has potential application in electronic device too. [55][56] To further characterize the surface characterization of the electrode, EDX analysis was performed. Table 1 shows the EDX results of the both electrodes, the active layer of both electrodes mainly consists of Sn, Sb, O, Pt and Ti elements.…”

Section: Analysis Methodsmentioning

confidence: 99%

Fabrication and Characterization of Pt doped Ti/Sb-SnO2 Electrode and its Efficient Electro-Catalytic Activity toward Phenol

Li¹,

Yan²,

Zhu³

2021

Eng. Sci.

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An optimized metal oxide electrode was prepared via the simple thermal decomposition method to improve the stability and electro-catalytic properties. It was found that Pt doping could effectively change the surface morphology. The Ti/Pt-Sb-SnO2 electrode possess compact and uniform surface packed with a large number of small particles. Besides, the influence of the Pt on the electrochemical performance was analyzed in detail. The oxygen evolution potential of Ti/Pt-Sb-SnO2 electrode decreased slightly, but it showed a smaller charge transfer resistance (0.2 Ω•cm 2 versus 1.67 Ω•cm 2 ) and a longer service lifetime which is almost 24-times longer than that of Ti/Sb-SnO2 (73 h versus 3h). Finally, electro-catalytic oxidation of phenol was employed. In the electro-catalytic process, both phenol and its possible intermediates were more rapidly decomposed on the Ti/Pt-Sb-SnO2 electrodes. The removal of chemical oxygen demand (COD) was 95.56% and 56.31% on the Ti/Pt-Sb-SnO2 and Ti/Sb-SnO2 electrodes, respectively. And the corresponding instantaneous current efficiency (ICE) of Ti/Pt-Sb-SnO2 electrode was higher than that of Ti/Sb-SnO2. Based on the experimental results, the prepared Ti/Pt-Sb-SnO2 electrode has better stability and excellent phenol electro-catalytic ability, further signifying that it has a good potential application prospect in the field of wastewater.

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Hierarchically porous Co/C nanocomposites for ultralight high-performance microwave absorption

Cited by 370 publications

References 52 publications

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

Fabrication and Characterization of Pt doped Ti/Sb-SnO2 Electrode and its Efficient Electro-Catalytic Activity toward Phenol

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