Large-scale, flexible and high-temperature resistant ZrO<sub>2</sub>/SiC ultrafine fibers with a radial gradient composition

Wang, Kunjie; Han, Cheng; Zheng, De-chuan; Lei, Yongpeng

doi:10.1039/c4ta00347k

Cited by 53 publications

(17 citation statements)

References 38 publications

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“…It is worthy to note that we designed and fabricated multi-needle electrospinning setup [27]. In the present work, we prepared B, N-codoped CNFs with hierarchically porous structure by heat treatment of electrospun CNFs with the mixture of boric acid/urea in N 2 (BNC f -N) and then activated in NH 3 (BNC f -NA).…”

Section: Introductionmentioning

confidence: 99%

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

Qiu

Lei

Wang

et al. 2015

Current Applied Physics

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Section: Introductionmentioning

confidence: 99%

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

Qiu

Lei

Wang

et al. 2015

Current Applied Physics

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“…3(a)) were recorded to characterize the degree of graphitization. All three samples exhibit two broad peaks at 2= 26° and 43°, attributed to the (002) and (100) facets of the graphitic material, respectively, indicating a low graphitization degree [41][42][43]. Furthermore, the corresponding Raman spectra (Fig.…”

Section: Resultsmentioning

confidence: 95%

N-doped graphene grown on silk cocoon-derived interconnected carbon fibers for oxygen reduction reaction and photocatalytic hydrogen production

et al. 2016

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Carbon-based metal-free catalysts are a promising substitute for the rare and expensive platinum (Pt) used in the oxygen reduction reaction. We herein report N-doped graphene (NG) that is exquisitely integrated into highly conductive frameworks, simultaneously providing more active sites and higher conductivity. The NG was in situ grown on carbon fibers derived from silk cocoon (SCC f ) using a simple one-step thermal treatment. The resulting product (NG-SCC f ), possessing a meso-/macroporous structure with three-dimensional (3D) interconnected networks, exhibits an onset potential that is only 0.1 V less negative than that of Pt/C and shows stability and methanol tolerance superior to those of Pt/C in alkaline media. Moreover, in the absence of Pt as co-catalyst, NG-SCC f shows a photocatalytic H 2 production rate of 66.0 μmol·h -1 ·g -1 , 4.4-fold higher than that of SCC f . This outstanding activity is intimately related to the in situ grown NG, hierarchically porous structure, and 3D interconnected networks, which not only introduce more active sites but also enable smooth electron transfer, mass transport, and effective separation of electron-hole pairs. Considering the abundance of the green raw material in combination with easy and low-cost preparation, this work contributes to the development of advanced sustainable catalysts in energy storage/conversion fields, such as electro-and photocatalysis.

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“…Generally, ZrO 2 fibers having the lengths larger than 1.0 m are defined as the continuous fibers . Unfortunately, the lengths of ZrO 2 continuous fibers are currently inferior to other ceramic continuous fibers as well as tensile strengths, for example, alumina fibers, mullite fibers, and silica carbide fibers . The preparation of high‐quality ZrO 2 continuous fibers involves sol‐gel and polyorganozirconium precursor methods which are both processed at low temperatures, far lower than the melting point of ZrO 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

et al. 2019

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High-strength zirconia (ZrO 2 ) continuous fibers, which are potential candidates as ultra-high temperature thermal insulators and reinforced materials, are typically fabricated by dry spinning an organozirconium precursor. However, the uncontrolled decomposition of organozirconium precursor usually occurs upon heat treatment that breaks the continuous fibers into pieces, resulting in the loss of tensile strength.Herein, in this contribution, we aimed to maintain the integrity of ZrO 2 precursor fibers during heat treatment. For this purpose, novel high-pressure vapor (HPV) pretreatment of ZrO 2 precursor fiber was introduced. The HPV pretreatment is considered to be efficient for the removal of the organics in precursor, promoting the formation of amorphous structures of Zr(OH) 4 and Zr(OH) 3 HCO 3 . Combining the studies of microstructures and tensile strengths, it was found that the amorphous structures played roles of cross-linking points, keeping the fibers integrity during the followed heat treatment. After HPV pretreatment, the high-strength ZrO 2 continuous fibers would be obtained by direct sintering in air without any atmosphere which substantially lowered the cost. The tensile strengths of sintered ZrO 2 continuous fibers pretreated by an optimized HPV procedure could reach up to as high as 1.299 GPa. The HPV pretreatment method provides a high-efficiency, low-cost technique for preparing high-quality ceramic fibers. K E Y W O R D Shigh-pressure vapor pretreatment, polyaceticzirconium, tensile strength, transition process

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Large-scale, flexible and high-temperature resistant ZrO₂/SiC ultrafine fibers with a radial gradient composition

Abstract: Novel ultrafine ZrO2/SiC fibers with a radial gradient composition were prepared by a simple electrospinning technique combined with subsequent thermal treatment.

Cited by 53 publications

References 38 publications

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

N-doped graphene grown on silk cocoon-derived interconnected carbon fibers for oxygen reduction reaction and photocatalytic hydrogen production

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

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Large-scale, flexible and high-temperature resistant ZrO2/SiC ultrafine fibers with a radial gradient composition

Abstract: Novel ultrafine ZrO2/SiC fibers with a radial gradient composition were prepared by a simple electrospinning technique combined with subsequent thermal treatment.

Cited by 53 publications

References 38 publications

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

N-doped graphene grown on silk cocoon-derived interconnected carbon fibers for oxygen reduction reaction and photocatalytic hydrogen production

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

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Large-scale, flexible and high-temperature resistant ZrO₂/SiC ultrafine fibers with a radial gradient composition