APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jian-Wei Luo,Jian-Dong Song,Wen-Zhi Jia,Zhi-Ying Pu,Ji-Qing Lu,Meng-Fei Luo
Catalytic dehydrofluorination of 1,1,1,3,3-pentafluoropropane to 1,3,3,3-tetrafluoropropene was performed on a series of fluorinated NiO/Cr 2 O 3 catalysts. The NiO/Cr 2 O 3 catalysts were more active than the Cr 2 O 3 because the new acid sites provided by NiF 2 had higher turnover frequencies (9.43 × 10 −3 − 12.08 × 10 −3 s −1 ) than those on the Cr 2 O 3 (4.55 × 10 −3 s −1 ). Also, the NiO/Cr 2 O 3 was more stable than the Cr 2 O 3 due to its lower density of surface acid sites, which alleviated the coke deposition on the catalyst as evidenced by the Raman spectroscopic results. The kinetic results revealed that the15NiO/Cr 2 O 3 had much lower activation energy (63.6 ± 4.5 kJ mol −1 ) than the Cr 2 O 3 (127.6 ± 3.8 kJ mol −1 ). Accordingly, different reaction pathways on the two catalysts were proposed, which involved the cleavage of the C F and C H bonds on the surface acid and base sites, respectively.
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 COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zixiao Nie,Long Wang,Jialei Li,Zhuo Li,Hao Xu,Yonghong Cheng,Yu Chen,Bing Xiao,Xin Xu
Interfacial engineering offers a promising solution to zinc anode instability, yet most studies focus solely on suppressing side reactions with water, overlooking the critical role of fast zinc ion kinetics. This work investigates the Cr 2 O 3- x artificial interface layer, demonstrating its dual benefits of electrostatic shielding and enhanced Zn 2+ transport kinetics. The Cr 2 O 3- x layer exhibits excellent mechanical stability and hydrophilicity, with its negatively charged surface effectively repelling anions like SO 4 2− and OH − to suppress side reactions. Moreover, the highly active Cr 2 O 3- x layer accelerates Zn 2+ migration, reduces nucleation energy barriers, and promotes uniform zinc deposition by facilitating Zn 2+ detachment from solvated structures. As a result, the Cr 2 O 3- x @Zn anode achieves exceptional cycling stability and remarkable reversibility, with symmetric batteries enduring over 1,800 h at 5 mA cm −2 . When paired with NH 4 V 4 O 10 , it also demonstrates long cycle life and superior rate performance. This work sheds new light on the development of stable, high-performance zinc anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Han Jin,Youju Huang,Jiawen Jian
Plate-like Cr 2 O 3 has been proved to be highly selective in sensing of nitric oxide (NO), while the sensing response of irregular shape and cubic-like Cr 2 O 3 toward NO was significantly interfered by hydrocarbons (HCs), e.g. C 3 H 6 . In this paper, sensing mechanism of the plate-like Cr 2 O 3 for selective sensing of NO (against HCs) was studied via crystallographic phase analysis, lattice fringes investigation and evaluation of the catalytic activity (gas-phase catalytic activity & electrochemical catalytic activity). The Cr 2 O 3 samples with plate-like, irregular shape and cubic-like microstructures have been confirmed to be the same crystallographic phase through XRD measurements, however, significant difference in the lattice fringes of these Cr 2 O 3 samples were observed via high-resolution transmission electron microscopy (HRTEM) & selected-area electron diffraction (SAED). The comparison results of catalytic activity for plate-like, irregular shape and cubic-like Cr 2 O 3 indicated that the unique selectivity for the plate-like Cr 2 O 3 was mainly caused by the electrochemical reaction specifically toward NO, which occurred near the interface between plate-like Cr 2 O 3 and zirconia-based electrolyte.
研究领域:
材料科学
·
化学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 47
·475706
·
IF 2.9
Wenrui Li,Xiong Yang,Changchun Qi,Yucheng Zhang,Yibo Dong,Xin Zhao,Zhiliang Gao,Na Feng,Baipeng Song,Guan-Jun Zhang
The exploration of deep space significantly increases the probability of spacecraft failures due to surface electrostatic discharge, which imposes higher vacuum insulation protection requirements on polyimide (PI), the external insulation material of spacecrafts. To address this challenge, this study proposes using silane coupling agent KH550 for organic grafting treatment of Cr2O3 nanoparticles, which are then used to dope and modify PI to enhance the vacuum surface insulation of PI films. The KH550 grafting improves the interface strength between the fillers and the matrix, allowing the fillers to be uniformly dispersed in the matrix. Compared to pure PI films, the prepared PI-Cr2O3@KH550 composite films exhibit significantly enhanced vacuum surface flashover voltage, improved surface/volume resistivity, and dielectric properties. The results demonstrate that PI composite films with 0.8% by mass of Cr2O3@KH550 show the most notable performance improvement, with the DC flashover voltage and impulse flashover voltage in vacuum increasing by 20.7% and 27.8%, respectively. The doping of chromium oxide nanoparticles introduces more deep traps into the PI films and reduce the surface resistivity. The higher deep trap density inhibits charge migration, thereby alleviating secondary electron emission and surface electric field distortion. Simultaneously, the lower surface resistivity facilitates dissipating surface charges and improves the surface insulation. These findings are of significant reference value for promoting the enhancement of aerospace insulation performance.
研究领域:
材料科学
·
航天工程
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Baihui Wang,Xuemin Xia,Ruyi Tang,Huan Jiang,Mengyao Qi,Xia Zhang
The low temperature solvothermal method synthesized Cr 2 O 3 NPs has not only peroxidase activity, but also oxidase activity. Then, the oxidase activity of Cr 2 O 3 NPs is effectively shielded by nanogel immobilization using three monomers acrylamide, NIPAAM (N-isopropylacrylamide) and MBA (N,N′-methylene bisacrylamide) in HEPES (4-(2-hydroxyerhyl)piperazine-1-erhanesulfonic acid) buffer. Ultimately, the enzymatic activity of Cr 2 O 3 @nanogel/Au is significantly enhanced after doping Au NPs by SERS (Surface Enhanced Raman Spectroscopy) evaluation. A SERS strategy was proposed for the detection of H 2 O 2 by Cr 2 O 3 @nanogel/Au. The linear range was 10 −8 mol·L −1 -10 −1 mol·L −1 .
研究领域:
生物化学
·
纳米医学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 13
·12113-12121
·
IF 2.195
Ruan Xuejun,Ren Xin,Zhou Wenting,Xu Xi,Wang Xin,Wang Manyu,Yan Ying,Yao Zheng,Shi Wen,Yu Wenqi
The effect of various proportions of SiO 2 and Cr 2 O 3 doping on the micro-characteristics and the electrical properties of the ZnO varistors were investigated. As the SiO 2 /Cr 2 O 3 ratio increased, the voltage gradient increased and then decreased, the nonlinear coefficient α increased, while the leakage current showed the opposite trend, meanwhile the residual voltage ratio was almost stable. When the SiO 2 /Cr 2 O 3 ratio was 1.7 mol% vs. 0.6 mol%, the ZnO varistors sintered at 1155 °C exhibited excellent comprehensive electrical properties with voltage gradient of 329.9 V/mm, nonlinear coefficient of 65.1, leakage current of 0 µA, residual voltage ratio of 1.663, and aging starting power of 0.72 W. The varistors were in good condition after being struck 18 times of 250 A square wave energy pulse impact, showing a great potential in the industrial application of power distribution systems.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 17
·14546-14556
·
IF 2.324
Sun Linchao,Yao Zhengjun,Haidry Azhar Ali,Li Zhong,Fatima Qawareer,Xie Lijuan
The paper demonstrated cost-effective one-step hydrothermal process to synthesize TiO 2 microrods modified with Cr 2 O 3 nanoparticles. The crystal structure, microstructure and chemical composition of the obtained materials were characterized by XRD, SEM, TEM and EDS analysis. Subsequently, for gas sensor tests the sensors were fabricated onto a ceramic tube having a designed pair of Au electrodes with four Pt wires. The results indicate that the sensors based on the optimal content of Cr 2 O 3 nanoparticles modified TiO 2 microrods possess excellent gas-sensing performance to acetone. Specifically, the sensor based on optimal 3% Cr 2 O 3 modified TiO 2 microrods exhibited high response (15), fast response/recovery time (5/28 s), outstanding selectivity (against 100 ppm ethanol, methanol and formaldehyde) and good stability (1–40 days) towards 100 ppm acetone at 300 °C. Relying on the analysis, we infer that performance can be controlled by varying the Cr 2 O 3 contents. A plausible sensing mechanism is also discussed to explain the reasons for the enhanced acetone sensing with Cr 2 O 3 –TiO 2 heterostructures.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Zeyu Jin,Yuelin Wang,Linshan Zhu,Jingzi Zhang,Xi Lin
Oxygen evolution reaction (OER) plays an important role in the energy conversion industry. Despite the prevalent reliance on noble metals for their superior catalytic attributes, their high cost and limited availability present significant challenges. Reducing the use of noble metals in catalysts while maintaining catalytic activity and stability in various chemical environments is a major challenge in heterogeneous catalysis. In this study, we have strategically enhanced the catalytic performance of the Cr 2 O 3 oxide by introducing multiple transition metal dopants to modulate its electronic structure. It is found that doping Ni/Co/Cu/Ru into the Cr 2 O 3 oxide results in the best OER performance, which outperforms RuO 2 and other reported materials. We further improved the cycling stability of the multi-component catalyst by coating amorphous carbon on its surface. Specifically, with an OER overpotential of merely 210 mV at 10 mA cm −2 and a low Tafel slope of 59.5 mV dec −1 , the catalyst exhibits remarkable catalytic efficiency. More importantly, it can withstand high current tests exceeding 100 mA cm −2 for over 80 h without significant degradation of its OER catalytic performance. In addition, the catalyst exhibits exceptional hydrogen evolution reaction (HER) performance which is close to Pt/C, making it suitable for use as a bifunctional water splitting device. These findings have opened up a new field for the design and application of multi-component catalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 14
·3417
·
IF 4.2
Pengfei Zhu,Zhaoxia Hu,Shouwen Chen
The development of economical catalysts that exhibit both high activity and durability for chlorinated volatile organic compounds (CVOCs) elimination remains a challenge. The oxidizing and acidic sites play a crucial role in the oxidation process of CVOCs; herein, praseodymium (Pr) was introduced into CrOx catalysts via in situ pyrolysis of MIL-101(Cr). With the decomposition of the ligand, a mixed micro-mesoporous structure was formed within the M-Cr catalyst, thereby reducing the contact resistance between catalyst active sites and the 1,2-dichloroethane molecule. Moreover, the synergistic interaction between chromium and praseodymium facilitates Oβspecies and acidic sites, significantly enhancing the low-temperature catalytic performance and durability of the M-PrCr catalyst for 1,2-dichloroethane (1,2-DCE) oxidation. The M-30PrCr catalyst possess enhanced active oxygen sites and acid sites, thereby exhibiting the highest catalytic activity and stability. This study may provide a novel and promising strategy for practical applications in the elimination of 1,2-DCE.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jianmin Chen,Hongtao Zou,Qilu Yao,Minghong Luo,Xiugang Li,Zhang-Hui Lu
The development of highly active, stable, and inexpensive catalysts for efficient and complete dehydrogenation of hydrazine is highly attractive but still very challenging. Herein, Cr 2 O 3 -modified NiFe (NiFe-Cr 2 O 3 ) nanopartciles (NPs) have been designed as the heterogeneous catalyst. Both the catalytic activity and hydrogen selectivity of Ni 0.9 Fe 0.1 -Cr 2 O 3 NPs were improved remarkably as compared with those of their mono-metallic counterparts. The prepared Ni 0.9 Fe 0.1 -Cr 2 O 3 catalyst exhibited an outstanding catalytic activity to release 3.0 equiv. (H 2 + N 2 ) from hydrazine in only 8.5 min at 70 °C, providing a turnover frequency (TOF) value of 893.5 h −1 based on surface metal atoms. Systematic studies indicated that the small size and high surface area of Ni 0.9 Fe 0.1 -Cr 2 O 3 as well as the strong synergistic electronic effect between Cr 2 O 3 and NiFe NPs resulted in the excellent activity of Ni 0.9 Fe 0.1 -Cr 2 O 3 catalyst. Such a highly rapid, long term durability, and low cost catalyst may encourage greatly the practical application of hydrous hydrazine as a chemical hydrogen storage material.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Jintong Liu,Yifan Dong,Xin Qiu,Haoxuan Ma,Tianqin Li,Xinhong Liu,Quanli Jia
Unfired calcium aluminate cement (CAC) bonded alumina-spinel based plug precasts have many advantages including energy saving, shorter placement period, lower cost and good thermal shock resistance in comparison with fired purging plugs. Unfortunately, their strength was drastically decreased in the range of 700°C–1000°C, which was attributed to the destruction of the hydrates network of the castables, and structural spalling was also occurred because of their lower strength. To respond these, a feasible method to fabricate higher strength of unfired precast was proposed by adding ZnO powders, and the effect of the ZnO content on the microstructure and properties of the castables was studied in this paper. Results demonstrate that cold strength of the specimens after heat-treating at different temperatures increases significantly by rising of the ZnO level, permanent linear change of the castables after firing at 1400°C and 1600°C decreases, and hot strength value noticeably increases from 36.3 to 58.4 MPa, exhibited that cold and hot strength of CAC bonded castables significantly improve via adding ZnO powders. Strengthening mechanism on the strength of ZnO-bearing castables is ascribed to formation of ZnAl 2 O 4 and ZnCr 2 O 4 , and their strengthening effect is much higher than that of the weakening effect by CAC hydration products fired at 600°C–1000°C, and this strength reinforcing effect is intensified with rising of heat-treating temperature. In addition, ZnCr 2 O 4 and ZnAl 2 O 4 can dispense in MA spinel grains to form spinel solid solution at 1400°C–1600°C, (Al 1− x Cr x ) 2 O 3 solid solution is formed via Cr 2 O 3 reacts with Al 2 O 3 . Those favor the densification process of the matrix structure, creating strength reinforcing effect of the ZnO-containing castables, thereby significantly increase their strength.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Changhao Feng,Zhongwei Jiang,Jingxuan Wu,Bin Chen,Geyu Lu,Chengzhi Huang
In this work, Pt-Cr 2 O 3 -WO 3 composite nanofibers have been designed by using Pt@MIL-101(Cr) and electrospinning. The morphological and microstructural properties of these nanofibers were analyzed by various kinds of techniques. The FESEM and TEM results demonstrate that the size of Pt nanoparticles is ˜ 3 nm, which greatly improved the gas sensing properties of metal oxides. The gas-sensing properties of WO 3 , Cr 2 O 3 -WO 3 and Pt-Cr 2 O 3 -WO 3 composite nanofibers were tested. Compared with pristine WO 3 nanofibers, Pt-Cr 2 O 3 -WO 3 composite nanofibers exhibit superior response toward xylene. At the optimal operating temperature of 325 °C, the response of Pt-Cr 2 O 3 -WO 3 composite nanofibers to 10 ppm xylene is 74.3, the response time is 5 s and the detection limit is 0.5 ppm. The sensing mechanism of the ultrahigh gas sensing properties attributes to the Cr 2 O 3 -WO 3 heterojunction, the catalytic activity of Cr 2 O 3 , porous structure, the electronic and chemical sensitization of Pt nanoparticles.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）