Journal of Materials Chemistry A
·
2025
·
IF 9.5
Pengzhan Yang,Cui Liu,Jiahao Zhu,Nian Li,Shudong Zhang,Zhenyang Wang
Silica fiber aerogels often show considerably increased high-temperature thermal conductivity because of the weak infrared extinction ability, while showing limited mechanical strength. Improving infrared shielding and boosting structural strength are key challenges in achieving high-temperature insulation with SiO2 nanofiber aerogels. Here, a multiphase sequence and multiscale structural engineering strategy is proposed to synthesize multiscale symbiotic carbonaceous SiO2 nanofiber aerogels composed of ZrO2 pinning structure to achieve high-temperature thermal insulating performance with high mechanical strength. ZrO2 nanocrystalline pinning effect can effectively impede the formation of shear band and suppress the generation-migration of pores and micro-cracks of single amorphous SiO2 nanofiber, enhancing thermal stability and mechanical strength. Besides, what is particularly impressive is that the design of the pinning structure can also stabilize high extinction symbiotic carbon species to achieve the presence of high content carbon, thereby suppressing the thermal radiation heat transfer to reduce high temperature thermal conductivity. Meanwhile, the layered assembly and coating construction at the mesoscale further enhance the antioxidant capacity of the aerogel. Finally, the 3D aerogel assembled in layers demonstrates outstanding mechanical properties (a compressive strength of 78.27 KPa at 60% strain and a tensile strength of 240.69 KPa, which is several times better than that of other ceramic fiber aerogels) and ultralow thermal conductivity over a wide temperature range (0.0935 W m-1 K-1 at 1000 oC, which is approximately one order of magnitude lower than that of conventional ceramic fiber aerogels). Our work provides a new option for heat insulation under extreme conditions.
研究领域:
材料科学
·
纳米技术
·
热工工程
·
陶瓷工程
·
航空航天材料
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Luna Ruan,Xinyu Han,Lihua Zhu,Congxiao Shang,Anna Kroner,Kaijie Liu,Yibo Zhang,Bing Hui Chen,Zhengxiao Guo
Metal nanoparticles are widely considered for heterogeneous catalysis due to their high atomic efficiency and tunable active microenvironment, but their specific functional tendencies are still unclear. Here, we report that a Rh@ZrO 2 /NC catalyst with only 0.1 wt% Rh exhibits exceptional catalytic performance and high selectivity (p-nitroacetophenone conversion-98.6 %, p-aminoacetophenone selectivity-100 %, r -56.4 mol p-nitroacetophenone /(mol Rh ·min)) towards the hydrogenation of the -NO 2 group in nitroarene to -NH 2 . This is because the interaction between Rh species and “ZrO 2 -N” results in significant hydrogen spillover in the catalyst, as supported by DFT calculations. Extensive characterizations from TG, DTG, NAP-XPS, in-situ Raman spectroscopy, in-situ DRIFT spectroscopy and DFT calculations further confirm the adsorption, activation and dissociation of hydrogen on Rh nanoparticles. The H* species migrate readily over ZrO 2 -NC, to facilitate the catalytic activity and selectivity for the hydrogenation of nitroarene. This study presents a new approach to develop highly efficient and selective metal nanoparticle-catalysts for cost-effective hydrogenation reactions.
研究领域:
催化化学
·
纳米技术
·
材料科学
·
化学反应工程
·
计算化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yumei Qin,Zhaoyang Ding,Wenwei Guo,Xiaolu Guo,Cheng Hou,Bang-Ping Jiang,Chun-Guang Liu,Xing-Can Shen
The utilization of diffusive solar energy through photocatalytic processes has received tremendous attention. Herein, a full-solar-spectrum photocatalyst with strong near-infrared (NIR) photoactivity, which is based on the synergy of oxygen vacancies (OVs) and doped boron that is cointegrated into zirconia (B@ZrO2–OV), is designed in this work. The doped photocatalyst is prepared via a controlled one-step NaBH4 reduction from white ZrO2. Density functional theory (DFT) calculations reveal that simultaneously introduced OVs and boron dopants on ZrO2 induced a narrow band gap (4.78 eV) and achieved charge separation (work function of 4.12 eV), thus confirming its excellent photocatalytic activity in the degradation of rhodamine B under NIR irradiation. In contrast, oxygen-deficient ZrO2 and white ZrO2 were inactive under NIR light. Therefore, this synergistic strategy provides an efficient way to use the narrow band gap of a classic semiconductor zirconia as a highly efficient catalyst for full-solar-spectrum-driven photocatalysis.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Haiqiang Lin,Hongyan Qu,Weikun Chen,Kang Xu,Jianwei Zheng,Xinping Duan,Hesheng Zhai,Youzhu Yuan
In gas-phase chemoselective hydrogenation of crotonaldehyde on Ag-based catalysts, zirconia doping on silica supports was found to improve catalytic performance in terms of unsaturated alcohol selectivity, hydrogenation activity, and stability. The surface modification of silica by zirconia doping favors the fine dispersion of Ag species due to the enhanced quantity and strength of surface acid sites, which enable construction of abundant catalytic sites effective for C O bond hydrogenation. High crotyl alcohol selectivity, exceeding 80%, and significant inhibition of monohydrogenation on the C C bond were observed on the optimal Ag/Zr–SiO 2 catalyst. Dynamic O 2 chemisorption measurement revealed that the pure Ag powders did not chemisorb O 2 irreversibly under 323 K, but SiO 2 or Zr–SiO 2 supported Ag catalysts did. The amounts of Ag active for O 2 chemisorption, which are at least one order of magnitude lower than that of surface Ag derived from TEM and XRD characterizations, match well with the perimeter interface Ag of hemispherical particles. A strong correlation between hydrogenation activity and O 2 uptake on those Ag/SiO 2 and Ag/Zr–SiO 2 catalysts with different Ag dispersions and deactivation degrees was observed, implying that the effective catalytic sites for crotonaldehyde chemoselective hydrogenation may originate from accessible interface sites with unique redox properties. Catalyst induction and deactivation were observed on both Ag/SiO 2 and Ag/Zr–SiO 2 catalysts in real catalytic operation. Changes in metal stable interface structure, rather than metal aggregation and coagulation, are assumed to be the main cause of irreversible catalyst deactivation, because the apparent Ag particle sizes changed slightly, but the oxygen chemisorption ability deteriorated considerably. Electropositive Ag sites interacting with neighboring oxygen from oxide supports at the ternary Ag–ZrO 2 –SiO 2 interface are proposed to account for highly selective C O bond hydrogenation to produce the desired unsaturated alcohol.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Fei Zuo,Fan Meng,Dong-Tao Lin,Jun-Jie Yu,Hong-Jian Wang,Shen Xu,Wei-Ming Guo,Carmen Cerecedo,Víctor Valcárcel,Hua-Tay Lin
A novel composite of 12 mol% CeO 2 -stablized tetragonal ZrO 2 reinforced with Al 2 O 3 whiskers (designated as Ce-TZP/A w ) has been prepared and studied in this work. The objective of this investigation was to systematically study the influence of whisker-aspect-ratio on the densification behaviors, microstructure evolution, and mechanical properties of Ce-TZP/A w composite. Results showed that the sintered density of composite increased and the grain growth tended to diminish with the decrease in whisker aspect radio. Both the fracture toughness and flexural strength reached maximum values of 475 ± 12 MPa and 11.4 ± 0.2 MPa m 1/2 , respectively at a whisker aspect ratio of about 12. It was also observed that the fracture toughness, flexural strength and tetragonal to monoclinic ZrO 2 transformation of the dual-phase composite exhibited similar variation trend as a function of the whisker-aspect-ratio, which suggested that the stress-induced phase transformation should be the main toughening and strengthening mechanism in the Ce-TZP/A w composite.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Shiyun Mu,Kai Liu,Hong Li,Zhenyu Zhao,Xiaoqi Lyu,Yilai Jiao,Xingang Li,Xin Gao,Xiaolei Fan
This work presents an efficient method of supporting zirconia (ZrO 2 ) on COOH functionalized multi-walled carbon nanotubes (ZrO 2 /MWCNTs(C)) via a microwave (MW)-assisted method, which can be used as an efficient catalyst for converting fructose to 5-HMF. The developed composite by the MW-assisted route shows highly dispersed ZrO 2 with small sizes of 4–5 nm on the carbon support, which could not be achieved the conventional hydrothermal synthesis. Characterization shows a unique zirconia amorphous structure which was ascribed to the special interaction between the carbon support and MW irradiation. Specifically, MWCNTs were heated selectively due to their strong MW-absorbing ability, which led to the formation of microscopic “hot spots”, enabling rapid synthesis (8 min) of highly dispersed ZrO 2 with smaller sizes on the hot surface of MWCNTs. Conversely, under conventional heating, the nucleation rate of ZrO 2 was slow and prone to form agglomerated particles on the carbon support. The amorphous ZrO 2 contributed to the excellent activity of ZrO 2 /MWCNTs(C) in fructose conversion to 5-HMF. In detail, fructose conversion and 5-HMF yield were achieved at ~72.8% and ~62.9%, respectively, for the catalyst prepared by the MW method, whilst they are only about 24.7% and 15.7% over the catalyst prepared by the conventional hydrothermal synthesis.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Bohan Wang,Guofu Xu,Jiwu Huang,Håkan Engqvist,Wei Xia,Le Fu
Effects of dopants with different valences on the densification behavior and phase composition of a ZrO 2 –SiO 2 nanocrystalline glass-ceramic (NCGC) during pressureless sintering were investigated in this study. The raw powder of Ca 2+ , La 3+ , Ce 4+ and Ta 5+ ions doped ZrO 2 –SiO 2 (referred to as Ca-ZS, La-ZS, Ce-ZS, Ta-ZS, respectively) and pure ZrO 2 –SiO 2 (PZS) sample were synthesized by sol-gel method, followed by pressureless sintering. Compared with the PZS sample, doping of Ca 2+ and La 3+ ions significantly promoted the densification of the NCGCs. The “densification promotion” effect was attributed to the formation of oxygen vacancies and the decrease of SiO 2 viscosity due to doping of aliovalent cations. The dopants with various valences showed significant effects on the phase compositions of the NCGCs during sintering. Doping of Ca 2+ ion accelerated the reaction kinetics between ZrO 2 nanocrystallites and amorphous SiO 2 to yield ZrSiO 4 . The La 3+ ion acted as destabilizer of t-ZrO 2 , which resulted in a rapid tetragonal (t) to monoclinic (m) ZrO 2 phase transformation during sintering, while in the Ta 5+ and Ce 4+ ions doped sample, the phase transformation occurred gradually. All the doping ions increased the lattice parameters and the volume of t-ZrO 2 unit cell, while the effects of the doping ions on the lattice parameters of m-ZrO 2 unit cell were more complex.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2023
·Vol. 148
·期 20
·5210-5220
·
IF 4.2
Huiyang Xu,Chuang Guo,Weijian Yuan,Wenna Zhang,Qiu Sun,Jianfeng Wu,Xuelin Zhang
In this study, a simple and portable electrochemical sensor based on laser-induced graphene (LIG) has been developed to systematically investigate the feasibility of LIG as an electrode to detect organophosphorus pesticides (OPs). It proves that the LIG-based electrode has a relatively high electrochemically active surface area (ECSA) and heterogeneous electron transfer (HET) of 0.100 cm2 and 0.000825 cm s−1, respectively. In addition, zirconium dioxide nanoparticles (ZrO2 NPs) have been modified on the electrode with three different binders, β-cyclodextrin (β-CD), chitosan (CS) and Nafion, to improve the adsorption capacity of the electrode toward OPs, and the effect of the binders on the performance of the as-fabricated sensor has been investigated in detail. The results show that β-CD increases not only the electrochemically active surface area of the electrode but also the redox peak current of methyl parathion (MP). To evaluate the sensitivity of the sensor, differential pulse voltammetry (DPV) curves have been tested in solutions containing different concentrations of MP using ZrO2-β-CD/LIG as an electrode, which shows a detection range of 5–200 ng ml−1 and a detection limit of 0.89 ng ml−1. In summary, the LIG-based sensor has a low detection limit, high sensitivity and good interference resistance, and thus has tremendous potential for the detection of pesticides in the environment.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Wanying Zhang,Fengyue Shi,Jianwen Wang,Yang Yang,Guangdong Zhao,Dongyu Zhao
In this study, porous ZrO 2 /SiZrBOC and SiZrBOC ceramic matrix composites were produced via vacuum impregnation method, using SiZrBOC ceramic precursor as a matrix, ZrO 2 fiber prepared via electrospinning as the reinforcing agent and polyurethane foam as a skeleton. Polyurethane foam with open porosity is rather a substrate for the creation of a skeletal 3D structure. The preparation process and pyrolysis mechanism of ZrO 2 /SiZrBOC polyurethane foam impregnated with a precursor solution were expounded. The thermal conductivity tests and mechanical property measurements show that the lowest thermal conductivity (0.0378 W m −1 K −1 ) was achieved in the ZrO 2 /SiZrBOC ceramic matrix composite at the pyrolysis temperature of 800 ℃, being much inferior to that of the SiZrBOC composite (0.0861 W m −1 K −1 ). At 1400 ℃, the maximum compressive strength of the porous ZrO 2 /SiZrBOC ceramic matrix composites reached a value of 1.37 MPa, while that of the SiZrBOC composites was 0.22 MPa only. Therefore, the addition of ZrO 2 fibers improved the compressive strength and thermal insulation properties of the composites.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Zhitong Zhou,Weixiang Guan,Xiaoli Pan,Shengxin Zhang,Yang Su,Aiqin Wang,Tao Zhang
Synthesis of primary amines from alcohols is an economical and green route to access high-value N-compounds. However, challenges remain to develop both cost-effective and efficient catalysts. In this study, we developed a Ru-Co/ZrO 2 single-atom alloy catalyst which afforded diverse primary amines from alcohols in the presence of ammonia and hydrogen with exceptional conversion (up to 90%) and selectivity (80%) under mild conditions (0.7 MPa NH 3 , 0.3 MPa H 2 , 160 °C) and exhibited satisfactory stability upon regeneration. The turnover rate was approximately 8.4 times higher than that observed over the Co/ZrO 2 catalyst. Characterizations indicated that the alloyed Ru facilitated the reduction of Co, strengthened the interaction with H 2 and mitigated the over-strong adsorption of aldehyde intermediates. These combined effects contributed significantly to the enhanced catalytic performances. This work presents a promising strategy for the development of advanced catalysts in the amination of alcohols.
研究领域:
催化化学
·
材料化学
·
绿色化学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Zepeng Li,Shixin Liu,Mingrun Du,Jinhua Wang,Gyaneshwar P. Srivastava,Mingchao Wang,Tong Wei,Yunling Zou,Ningru Xiao,Qingjun Zhou
Eu and Y co-doped ZrO 2 is fabricated by solid state reaction method. ZrO 2 /Eu/Y products evolve from the monoclinic phase to the monoclinic/cubic phase in structure as the Eu ion content increases. Monoclinic/cubic heterophase junction is obtained during structural evolution, which develops a new route to fabricate ZrO 2 heterophase junction. Photocatalytic property measurement is carried out for ZrO 2 /Eu/Y materials. The ZrO 2 /Eu 0.1 /Y monoclinic/cubic heterophase junction promotes photogenerated electron-hole separation effectively and hence exhibits better photocatalytic performance.
研究领域:
材料科学
·
化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jun Pan,Pei Zhao,Heliang Yao,Lulu Hu,Hong Jin Fan
The main role of inert fillers in polymer electrolytes is to enhance ionic conductivity. However, lithium ions in gel polymer electrolytes (GPEs) conduct in liquid solvent rather than along the polymer chains. So far, the main role of inert fillers in improving the electrochemical performance of GPEs is still unclear. Here, various low-cost and common inert fillers (Al2O3, SiO2, TiO2, ZrO2) are introduced into GPEs to study their effects on Li-ion polymer batteries. It is found that the addition of inert fillers has different effects on ionic conductivity, mechanical strength, thermal stability, and, dominantly, interfacial properties. Compared with other gel electrolytes containing SiO2, TiO2, or ZrO2 fillers, those with Al2O3 fillers exhibit the most favorable performance. The high performance is ascribed to the interaction between the surface functional groups of Al2O3 and LiNi0.8Co0.1Mn0.1O2, which alleviates the decomposition of the organic solvent by the cathode, resulting in the formation of a high-quality Li+ conductor interfacial layer. This study provides an important reference for the selection of fillers in GPEs, surface modification of separators, and cathode surface coating.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）