Heterostructured TiO<sub>2</sub>/C/Co from ZIF-67 Frameworks for Microwave-Absorbing Nanomaterials

Rehman, Sajid Ur; Liu, Jian; Fang, Zemin; Wang, Jingmin; Ahmed, Rashida; Chun-chang, Wang; Hong, Bo

doi:10.1021/acsanm.9b00841

Cited by 68 publications

(43 citation statements)

References 63 publications

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“…Titanium dioxide (TiO 2 ) has distinct advantages in battery materials because of its wonderful natural abundance, low cost, and stable crystal structure. Thus, it has been extensively reported as anode electrode materials for LIBs and commonly exhibited long cycling stability due to small changes in volume size during repeated insertion/extraction of the crystal structure [10][11][12][13]. Nevertheless, theoretical specific capacity of TiO 2 is 336 mAh g −1 based on inserting 1 mol Li per molecule, its actual specific capacity is usually not satisfied and the Li insertion amount is frequently limited below 0.5 mol [14].…”

Section: Introductionmentioning

confidence: 99%

Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

Pei

Liu

et al. 2021

Nano-Micro Lett.

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Wearable and portable mobile phones play a critical role in the market, and one of the key technologies is the flexible electrode with high specific capacity and excellent mechanical flexibility. Herein, a wire-in-wire TiO2/C nanofibers (TiO2 ww/CN) film is synthesized via electrospinning with selenium as a structural inducer. The interconnected carbon network and unique wire-in-wire nanostructure cannot only improve electronic conductivity and induce effective charge transports, but also bring a superior mechanic flexibility. Ultimately, TiO2 ww/CN film shows outstanding electrochemical performance as free-standing electrodes in Li/K ion batteries. It shows a discharge capacity as high as 303 mAh g−1 at 5 A g−1 after 6000 cycles in Li half-cells, and the unique structure is well-reserved after long-term cycling. Moreover, even TiO2 has a large diffusion barrier of K+, TiO2 ww/CN film demonstrates excellent performance (259 mAh g−1 at 0.05 A g−1 after 1000 cycles) in K half-cells owing to extraordinary pseudocapacitive contribution. The Li/K full cells consisted of TiO2 ww/CN film anode and LiFePO4/Perylene-3,4,9,10-tetracarboxylic dianhydride cathode possess outstanding cycling stability and demonstrate practical application from lighting at least 19 LEDs. It is, therefore, expected that this material will find broad applications in portable and wearable Li/K-ion batteries.

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Section: Introductionmentioning

confidence: 99%

Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

Pei

Liu

et al. 2021

Nano-Micro Lett.

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“…4(b) locating at 528.9, 530.8, and 531.9 eV corresponding to lattice oxygen (LO), oxygen vacancy (VO), and chemically absorbed H2O (CO), respectively. [22][23][24][25][26][27][28][29][30][31] The doping of Ca, Sm, and Nd has created many oxygen vacancies as can be seen from the XPS spectra. The O spectra also show that CO peak due to adsorbed water is also present in all three samples, meaning that it can be used for humidity sensitivity measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The reduction of permittivity in thermally treated and air-quenched samples supports the above result. [25][26][27][28] Fig. 11 shows the Cole-Cole plots of CCO, CSO and CNO at 400, 420 and 440K temperature, respectively, as it can tell the contribution of bulk and interface towards dielectric properties.…”

Section: Resultsmentioning

confidence: 99%

Maxwell-Wagner Relaxation in Ca-, Sm- and Nd-doped Ceria

Ahmed¹,

Wang²,

Rehman³

et al. 2021

Eng. Sci.

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Doped ceria, i.e. Ce1-xMxO2-with M being dopant metal, has been a focus of great attention for solid oxide fuel cells (SOFCs) due to their high oxygen conduction. In the past literature, the dielectric relaxations in these materials have been ascribed to be caused by defect associates (MCeʺ-V̈) possessing different MCeʺ and V̈ distances. But we believe that with changing measurement and analysis techniques, it is necessary to invest our time to re-examine the already reported materials and take a detailed investigation of the underlying phenomenon behind their dielectric relaxations again. Thus, we have used solid-state reaction to prepare Ce1-xMxO2- with M=Ca, Sm, and Nd in x=0.1, 0.2, and 0.3 ratios, respectively. The as-prepared and post annealed samples were tested for dielectric properties from 300-1080 K with varying frequencies. The lowtemperature relaxation (R1) was argued to be a Maxwell-Wagner relaxation caused by humidity sensitivity. The hightemperature relaxation (R2) was ascribed to be caused by the hopping motion of oxygen vacancies. This fact was also supported by a detailed analysis of impedance spectra. While according to the previous reports, this relaxation is because of the oxygen-vacancy-dopant defect pair.

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“…To investigate the intrinsic reasons of this Co@PANI@PU hybrid composite for EM wave absorption, its dielectric loss factor and magnetic loss factor were evaluated. The two loss factors were calculated based on the equations as below

\tan {normalδ}_{ε} = \frac{ε ″}{ε'}

\tan δ_{normalμ} = \frac{μ ″}{μ'}

…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Magnetic Cobalt and Electrically Conductive Polyaniline‐Filled Three‐Phase Nanocomposite for Microwave Absorption

Yao

Xia

Qiu

et al. 2019

Physica Status Solidi (a)

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Magnetic cobalt (Co) and electrically conductive polyaniline (PANI)-filled polyurethane (PU) composite (Co@PANI@PU) film is proposed for microwave absorption. This three-phase Co@PANI@PU composite is fabricated through mechanical ball milling of Co microspheres and PANI particles, followed by their casting forming with PU. Prior to that, Co microspheres and conductive PANI are synthesized by ultrasonic-assisted solution reduction and simple oxidation polymerization, respectively. Field-emission scanning electron microscopy and X-ray diffraction characterizations indicate that the Co microparticles have sufficient incorporation into PANI and PU matrices. Electrical conductivity measurement shows that the PANI composition improved the conductivity of Co@PANI@PU film, whereas the Co composition suppressed it. The microwave absorption property of these Co@PANI@PU composite films under low filling contents of Co and PANI, and with small thickness (1 mm), is investigated in the 0.1-18 GHz range. The results indicate that the reflection loss increased with increasing Co and PANI compositions. 16:8:100 w/w/w Co@PANI@PU shows the highest absorption within 0.1-8.8 GHz, whereas 16:16:100 Co@PANI@PU absorbed most at 10.2-18 GHz. This is attributed to different contributions of permittivity and permeability of the Co and PANI compositions to energy loss in the two frequency bands. Therefore, appropriate ratio and content of the Co and PANI compositions play significant roles for frequency-adjustable microwave absorption.

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Heterostructured TiO₂/C/Co from ZIF-67 Frameworks for Microwave-Absorbing Nanomaterials

Cited by 68 publications

References 63 publications

Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

Maxwell-Wagner Relaxation in Ca-, Sm- and Nd-doped Ceria

Fabrication of Magnetic Cobalt and Electrically Conductive Polyaniline‐Filled Three‐Phase Nanocomposite for Microwave Absorption

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Heterostructured TiO2/C/Co from ZIF-67 Frameworks for Microwave-Absorbing Nanomaterials

Cited by 68 publications

References 63 publications

Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

Maxwell-Wagner Relaxation in Ca-, Sm- and Nd-doped Ceria

Fabrication of Magnetic Cobalt and Electrically Conductive Polyaniline‐Filled Three‐Phase Nanocomposite for Microwave Absorption

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Heterostructured TiO₂/C/Co from ZIF-67 Frameworks for Microwave-Absorbing Nanomaterials