JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Zhibin Pang,Jialong Duan,Yuanyuan Zhao,Qunwei Tang,Benlin He,Liangmin Yu
High-temperature supercapacitors with enhanced charge transportation and capacitances are promising to meet specific requirements for underhood automotive component, oil drilling , military and space applications. However, state-of-the-art supercapacitors are always operated at room temperature due to the thermal instability of the hydrous electrolytes and organic separators. Herein, we present the fabrication of a high-temperature supercapacitor tailored by a ceramic NiO/ZrO 2 separator. This supercapacitor has a working temperature up to 140 °C, a capacitance of 342 F g -1 at current density of 2 A g −1 and good cycling stability over 2000 cycles. The experimental realization of physical proof-of-concept high-temperature supercapacitors may provide new opportunities for markedly improving the capacity of energy storage systems .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
PROGRESS IN REACTION KINETICS AND MECHANISM
·
2017
·
IF 0.682
Hua Song,Shengnan Li,Hualin Song,Feng Li,Huapeng Cui
A number of Zn–S2O82–/ZrO2–Al2O3 (Zn(x)–SZA) catalysts with different Zn mass fractions were synthesised and characterised by using X-ray diffraction, the Brunauer–Emmett–Teller method, and H2 temperature-programmed reduction. The structure and isomerisation performance of Zn(x)–SZA catalysts were studied using n-pentane as a probe reaction. The results showed that a pure tetragonal ZrO2 phase was formed on Zn(x)–SZA, and the ZrO2 crystallite sizes of the tetragonal phase increased in the order: Zn(0.5)–SZA < Zn(1.0)–SZA < Zn(1.5)–SZA < Zn(2.0)–SZA < SZA. Zn can strengthen the interaction between persulfate ions and the support, promote the formation of stronger acidity, lead to a better dispersion of sulfate ions on the surface, and improve the redox performance of the catalysts. The Zn(1.0)–SZA catalyst exhibited the best catalytic activity for n-pentane isomerisation. At a temperature of 170 °C, a reaction pressure of 2.0 MPa, a molar H2/n-pentane ratio of 4:1, and a weight hourly space velocity of 1.0 h−1, the isopentane yield reached 58.0%.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 2
·937-952
·
IF 1.8
Zhang Xing,Wang Zhongze,Shu Sihao,Liu Shengnan,Wang Dandan,Chen Jixiang
ZrO 2 -supported Ni and Ni-Co alloy catalysts were synthesized by co-precipitation method and tested for the hydrogenation of phenol in aqueous phase. Cyclohexanol and cyclohexanone are dominatingly generated on all the catalysts, and the deoxygenation products are minor. The Ni-Co alloy gives higher phenol conversion and the total yield of cyclohexanol and cyclohexanone compared to the metallic Ni. This is attributed to high metal dispersion due to the formation of Ni-Co alloy and the synergetic effect of Ni and Co in the alloy. ZrO 2 -supported Ni-Co alloy with the Ni/Co atomic ratio of 1 and the metal mass loading of 15% possesses the best performance. The total yield of cyclohexanol and cyclohexanone reaches 91.3% with the cyclohexanol/cyclohexanone molar ratio of 2.79. The phase composition of ZrO 2 -supported Ni-Co alloy remains stable during recycling, while the slight sintering of ZrO 2 and Ni-Co alloy particles can account for the catalyst deactivation. It has also been found that the presence of water may facilitate the keto-enol tautomerization and stabilize the ketone intermediates, leading to higher cyclohexanone yield than using n-octane as solvent.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 1
·124-137
·
IF 2.482
Xi Zhiwen,Jia Wenzhi,Zhu Zhirong
Abstract Two series of WO 3 –ZrO 2 and WO 3 –ZrO 2 –TiO 2 composite oxides were prepared via an Evaporation Induced Self Assembly (EISA) method and applied for the hydrogenolysis of glycerol after loading with Pt. Several techniques like XRD, BET, Raman spectroscopy, NH 3 -TPD, Py-IR, TEM and XPS were adopted to characterize the physicochemical properties of the as-synthesized catalysts. The structure and catalytic activities of these catalysts were significantly affected by the calcination temperature of the composite oxides. The introduction of TiO 2 into Pt/WO 3 –ZrO 2 could inhibit the drastic decrease in catalytic performance due to the formation of inactive crystalline WO 3 under high calcination temperature of 800 ℃. A maximum activity was obtained on the Pt/WO 3 –ZrO 2 –TiO 2 catalyst when the calcination temperature was 600 ℃, which gave 73.8% glycerol conversion and 25.4% 1,3-propanediol yield. While the Pt/WO 3 –ZrO 2 catalyst only exhibited 53.4% glycerol conversion and 20.2% 1,3-propanediol yield. The enhanced activity of Pt/WO 3 –ZrO 2 –TiO 2 was ascribed to the improved acidity originating from (i) higher acidic properties of WO x species when linked to Ti with larger electronegativity other than Zr and (ii) new acid centers caused by heteroatoms linkage as the combination of ZrO 2 and TiO 2 . The effects of Pt loading amount and reaction temperatures were also investigated. Graphic Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2025
·
IF 5.5
Bin Tian,Xinzhu Gan,Zhigang Wang,Yong Xu,Lin Wang,Conghe Xu,Ling Li
In this study, TiO 2 nanosheets were directly grown on ZrO 2 fibers by employing a solvothermal technique without requiring a TiO 2 seed layer, targeting thermal radiation shielding applications. The crystalline form and microstructure of the TiO 2 nanosheets were characterized using SEM, Raman, XRD, XPS, and TEM. The infrared thermal radiation extinction properties of the TiO 2 nanosheets were evaluated using DRS and effective specific extinction coefficient ( e *), and their thermal endurance at high temperatures was also assessed. The results showed that, within the infrared band of 2.5 to 8.5 μm, the TiO 2 nanosheet arrays with a thickness of 423 nm enhanced the e* of ZrO 2 fibers by 58.59 %. At similar coating thicknesses, nanosheet coatings exhibited superior thermal radiation shielding performance compared to nanoparticle coatings. These findings suggest that ZrO 2 fibers loaded with TiO 2 nanosheets are promising candidates for thermal radiation shielding in aerogels or extreme environmental conditions.
研究领域:
材料科学
·
热防护技术
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Xue-Ling Wei,Na Li,Wen Jun Yi,Li-Jun Li,Zi-Sheng Chao
The super-hydrophobic (SH) porous ceramics material with good stability was successfully prepared via the hydrothermal growth of CeO 2 micro/nano-structure and the subsequent dip-coating of low surface energy substance 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) over the surfaces of ZrO 2 -SiO 2 porous ceramics substrate. The surface morphology , chemical composition and wettability of material were investigated by means of SEM, EDS, XRD , FT-IR, and contact angle measurement. It was found that a layer of CeO 2 nano-flowers had been attached over the surfaces of ZrO 2 -SiO 2 porous ceramics substrate, using the optimized concentration of CeNO3 precursor, and after the grafting of PFDTES, the super hydrophobicity of the obtained material was achieved, with the water contact angle being as high as 162° and sliding angle being approximately 0°. Particularly, the super hydrophobicity was found to occur also in the pores of the obtained material. The obtained material was found to possess the significantly large thermal and chemical stabilities.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Boyong Ye,Ruru Zhou,Caili Wang,Zixuan Wang,Zixin Zhong,Zhaoyin Hou
Polylactic acid (PLA) is popularly used to replace some petroleum-based polymers due to its biodegradability. However, biodegradation of waste PLA requires specific bacteria, stringent conditions and long time. Catalytic recycling of waste PLA to valuable added products rather than composting is a sustainable green routine. In this work, catalytic alcoholysis of waste PLA to methyl lactate (MLA) was carried out over a SiO 2 @UiO-66 derived solid acid (SO 2– 4 /ZrO 2 /SiO 2 ). Characterizations indicated that SO 2– 4 /ZrO 2 /SiO 2 processed large surface area and homogenously dispersed acid sites, and it exhibited excellent performance for the alcoholysis of waste PLA under mild conditions. At 140 o C, the yield of MLA is 92.7% within 5 h, and SO 2– 4 /ZrO 2 /SiO 2 could be recycled at least five times without obvious loss of activity. The specific yield of MLA over SO 2– 4 /ZrO 2 /SiO 2 reached 2678 mg-MLA/g-cat/h, which was higher than that of H 3 PW 12 O 40 , Amberlyst-45, H β , HZSM-5 and α -ZrP. At the same time, SO 2– 4 /ZrO 2 /SiO 2 was also capable of the alcoholysis of waste PLA-based products. A possible pathway of PLA alcoholysis over SO 2– 4 /ZrO 2 /SiO 2 catalyst was proposed.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Jiayu He,Faqin Xie,Xiangqing Wu,Lang Li,Rui Luo,Hanming Yang,Shaoqing Wang
PEO composite coatings doped with ZrO 2 and MoS 2 particles were prepared on the surface of TC21 alloy using the PEO process. The morphologies and phase compositions of the coatings were analyzed using FE-SEM, TEM, XRD refinement and XPS. The tribological and self-lubricating properties of the coatings were investigated through fretting wear experiments. The results indicate co-doping reduced the friction coefficient by approximately 30 %. The co-doped coating demonstrated higher crystallinity, whereas the ZrO 2 coating contained a significant amount of amorphous material. The wear mechanisms of the coating included three-body abrasive, adhesive, and oxidative wear. The self-lubricating properties of the coating were derived from the presence of MoS₂ and the destruction and deformation of the coating surface during fretting wear.
研究领域:
材料科学
·
表面工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 8
·8169-8176
·
IF 1.798
Jiang Yancheng,Xu Yunhua,Feng Guitao,Yao Hanchao
Ni–Co/ZrO 2 nanocomposite coatings were produced by high-frequency pulse electrodeposition in a modified Watt’s bath containing ZrO 2 particles. The surface morphology, microstructure, and high temperature oxidation resistance of the coatings were characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction, and isothermal oxidation tests. It was found that the presence of ZrO 2 particles resulted in changes in the morphology and structure of the coatings. The results also confirmed the nanostructure and uniform distribution of ZrO 2 particles of Ni–Co/ZrO 2 nanocomposite coatings. The addition of ZrO 2 did not change the preferred orientation (200), but remarkably affected the relative intensity of planes of Ni–Co alloy. The influence of duty cycle, average current density, and frequency on the amount of incorporated ZrO 2 particles in the Ni–Co/ZrO 2 nanocomposite has been also investigated. The Ni–Co/ZrO 2 nanocomposite coatings with highest ZrO 2 content (11.6 wt%) were prepared under the condition of duty cycle of 40 %, average current density of 5 A dm −2 , and frequency of 100 kHz. Moreover, the embedded ZrO 2 particles significantly improved the high temperature oxidation resistance of Ni–Co alloy coatings. The oxidation rate of Ni–Co/ZrO 2 nanocomposite coatings decreased with increasing the ZrO 2 content of the coatings.
研究领域:
材料科学
·
表面工程
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jun Zhu,Jun Chen,Jianan Chen,Jicheng Zhou,Wentao Xu
Direct decomposition of H 2 S into H 2 and S is an attractive alternative to the Claus process, because CO x -free H 2 and S can be simultaneously recovered from an abundant and toxic waste gas, which has huge social economic and ecological environmental benefits. However, it is still a great challenge to achieve the direct H 2 S decomposition reaction with high efficiency due to the thermal equilibrium limitation. Herein, a core-shell structured Mo x C@ZrO 2 was developed as novel microwave catalyst for microwave catalytic H 2 S decomposition. More specifically, the H 2 S conversion over Mo x C@ZrO 2 catalyst is as high as 99.9% at 650 °C, which immensely surpasses the H 2 S equilibrium conversion (6.1% at 650 °C). This study provides an effective strategy for the design of highly active microwave catalysts, and supplies a strategy for efficiently catalytic decomposition of H 2 S waste and recovering high-value hydrogen and sulfur at lower reaction temperatures.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Le Fu,Bohan Wang,Yabin Zhu,Tielong Shen,Ying Deng,Guofu Xu,Jiwu Huang,Yucheng Feng,Liangting Sun,Wei Xia
Developing new radiation-resistant materials and understanding the structural damages caused by radiation are persistent goals of material scientists. Here, we report on the structural integrity and damage to ZrO 2 -SiO 2 nanocrystalline glass-ceramics after radiation with 1.4 MeV He ions at three different fluences: 1.0 × 10 16 ions/cm 2 (low), 5.0 × 10 16 ions/cm 2 (moderate), and 1.0 × 10 17 ions/cm 2 (high) at 500 °C. Grazing incident X-ray diffraction shows the tetragonal-ZrO 2 to monoclinic-ZrO 2 phase transformation induced by microstrain from the irradiation. The addition of yttrium indicated tetragonal-ZrO 2 stabilization effect during irradiation. The irradiated glass-ceramics show a Raman signal-enhancement effect probably related to the electronic structure changes of the amorphous SiO 2 component in the glass-ceramics. The formation of microcracks and lattice defects within ZrO 2 nanocrystallites is the main structural damage caused by irradiation. There was no observable amorphization of ZrO 2 nanocrystallites due to irradiation. No obvious He bubbles were detected, either. The formation of microcracks results in a decrease of in the nanohardness of the glass-ceramics. The results provide fundamental experimental data to understand the structural integrity and damage caused by radiation, which could be useful to design radiation‐resistant nanocrystalline glass-ceramics for extremely radioactive environments.
研究领域:
材料科学
·
核能工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jiahe Li,Xing-Yue He,Xiaowen Wang,Yiwei Lv,Jian-Gong Ma,Bo Li,Peng Cheng
CO2 hydrogenation is one of the key technologies for carbon recycling and greenhouse effect mitigation. Cu-based catalysts have been widely used in the hydrogenation of CO2 to methanol. However, the low catalytic efficiency and instability of Cu-based catalysts limit their industrial application. Herein, a Zr-based metal−organic framework was used to synthesize a Cu NWs@ZrO2 catalyst with a Cu-ZrO2 interface. The Cu NWs@ZrO2 catalyst shows high activity with promising selectivity and excellent stability for the synthesis of methanol from CO2 hydrogenation. Density functional theory calculations and in situ diffuse reflectance Fourier transform infrared spectroscopy confirmed that the CO2 hydrogenation on Cu NWs@ZrO2 followed the HCOO* pathway, and the Cu-ZrO2 interface made a significant contribution to the key intermediate step of CO2 to HCOO* and accelerated the CO2 hydrogenation.
研究领域:
化学工程
·
催化材料
·
环境科学
✓ 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）