LANGMUIR
·
2022
·
IF 4.331
Zhiliang Jin,Xiaohong Li,Teng Li,Youji Li
Graphdiyne (g-CnH2n–2) is a new carbon material composed of sp and sp2 hybrid carbon atoms. Since the synthesis by Li’s team, graphdiyne has been widely studied in other fields because of its excellent properties. In this paper, graphdiyne was synthesized from copper-containing materials and the composite GDY/CuI/MIL-53(Al) S-scheme heterojunction is prepared for photocatalytic cracking of water to produce hydrogen. First, GDY/CuI was prepared by organic synthesis, and then GDY/CuI was anchored on the surface of MIL-53(Al) by in situ ultrasonic stirring. After the continuous optimization of experimental conditions, the final hydrogen evolution rate is much higher than that of MIL-53(Al). This efficient photocatalytic performance can be attributed to the S-scheme heterojunction formed by the unique energy band arrangement. At the same time, the mechanism of charge transfer was demonstrated by in situ irradiation X-ray photoelectron spectroscopy. The strong interaction among the three strongly promotes the separation and transfer of photogenerated electron–hole pairs.
研究领域:
材料科学
·
能源化学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 3
·1414-1424
·
IF 2.956
Yaowu Wei,Tao Zhang,Qi Zhang,Bingqiang Han,Nan Li
Improving the hydration resistance of CaO aggregates is the key to successful application of lime-based refractories in metallurgical industry. Additive Zr(OH) 4 and Al(OH) 3 were introduced in the preparation of CaO granules using granulation equipment and calcination method in this study. The results showed that the hydration resistance of CaO granules was improved significantly, especially for granules with 0.6 wt.% Zr(OH) 4 and 0.9 wt.% Al(OH) 3 , respectively. The shell of CaO granules was relatively dense after calcination and the volume of open pores of CaO granules decreased from 3.56 × 10 −2 to 1.80 × 10 −2 cm 3 /g when additive was introduced. Zr(OH) 4 and Al(OH) 3 have the opposite effect on the closed porosity of CaO granules, the closed porosity of CaO granules was decreased with Zr(OH) 4 addition, but increased with Al(OH) 3 addition.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Minwang Laipan,Haoyang Fu,Runliang Zhu,Luyi Sun,Rachel M. Steel,Sujuan Ye,Jianxi Zhu,Hongping He
Acid drainage (AD) poses a significant concern for water pollution due to its strong acidity and the toxicity of its various contaminants (e.g., heavy metal ions). In order to minimize the harmful effects of AD, the acidity must be neutralized and the contaminants be removed. The capacity of calcined Mg/Al layered double hydroxide (Mg/Al-CLDH) for simultaneously neutralizing the pH of AD and removing various heavy metal cations and oxyanions (Cr(VI) and phosphate) was studied herein. The interactions throughout co-removal between metal cations (in short M) and oxyanions were particularly investigated. In the solution with only M, Mg/Al-CLDH was capable of neutralizing solution pH and removing M. The reconstruction of LDH from Mg/Al-CLDH produced OH – to neutralize pH and partially remove M through precipitation. FT-IR results suggested that forming H-bonds with the reconstructed LDH (R-LDH) might also contribute to M removal. In the solution containing both M and oxyanions, M and oxyanions could mutually affect their removal efficiency by Mg/Al-CLDH. M weakened the removal capacities of Cr(VI) and phosphate, because it could compete for adsorption sites on R-LDH. Cr(VI) and phosphate showed complex effects on the removal of M: Low concentrations of Cr(VI) promoted the removal of M by providing extra adsorption sites; high concentrations of Cr(VI), however, had the opposite effect, as a high concentration of Cr(VI) might largely occupy the adsorption sites on R-LDH. By contrast, phosphate inhibited the removal of M considerably, which might be ascribed to its strong buffering ability that maintained a relatively strong acidic nature of the solution. Our results, for the first time, showed that Mg/Al-CLDH is particularly suitable for the treatment of AD containing various contaminants.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yifei Chen,Meng Li,Qin Zhu,Wei Bai,Xiaofang Liu,Mingwu Xiang,Junming Guo,Jintao Liu
The Jahn-Teller effect and Mn dissolution always restrict the practical electrochemical properties of spinel LiMn 2 O 4 cathode material. Herein, a low-temperature solid-state combustion method is employed to synthesize various truncated octahedral LiZn 0.03 Al x Mn 1.97- x O 4 ( x ≤ 0.08) with submicron structure. The Zn/Al dual-doping is conducive to forming {110} and {100} planes, and is also beneficial to the crystal development of LiMn 2 O 4 . It is found that as the amount of Al doping increases, the average particle size gradually decreases from 188 nm to 113 nm. In addition, the Zn/Al co-doping integrated with small particles can improve the high-rate performance. The optimal LiZn 0.03 Al 0.03 Mn 1.94 O 4 exhibits submicron truncated octahedral morphology, high crystallinity , and good particles dispersibility . Benefiting from these structure merits, the LiZn 0.03 Al 0.03 Mn 1.94 O 4 delivers the first discharge capacity of 113.1 mAh⋅g −1 and low capacity fade of 9.9 % after 300 cycles at 1C. It also shows the high first discharge capacity of 86.6 mAh⋅g −1 at 10C and the high capacity retention of 72.1 % after 2000 cycles. Even at ultrahigh current density of 15C and 20C, the ultralong cycling lifespans over 2000 cycles are also achieved in LiZn 0.03 Al 0.03 Mn 1.94 O 4 cathode material. The excellent electrochemical properties are ascribed to its relatively high Li + diffusion coefficient (1.60 × 10 −11 cm 2 ⋅s −1 ) and low apparent activation energy (25.45 kJ⋅mol −1 ) during the de-intercalation process. The Zn/Al dual-doping and submicron truncated octahedron designs of the LiMn 2 O 4 provide a scientific reference to prepare high-performance cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Jun Chen,F. Xu,L. Sun,Kexiang Zhang,Yongpeng Xia,Xiaolei Guo,Huanzhi Zhang,Fang Yu,Erhu Yan,Hongliang Peng,Pengru Huang,Shujun Qiu,Cuili Xiang,Yujie Sun
In this work, Ni-Bi-B alloy has been synthesized via chemical synthesis method . A new kind of Al-InCl 3 -(Ni-Bi-B) composite has been prepared by high energy mechanical ball grinding Al powder with additives. Results show that the doped Ni-Bi-B alloy can significantly improve the hydrogen generation performance of Al-InCl 3 and the catalytic activity is enhanced with the increasing content of Bi in Ni-Bi-B alloy. Under optimal conditions, the hydrogen generation yield and conversion yield of Al-InCl 3 -(Ni-Bi-B) reached 1196.8 mL g −1 and 100.0% at room temperature, respectively. Mechanism study shows five kinds of active sites, such as the fresh surface/defect of Al particle , Al-AlCl 3 , Al-In, Al-Bi/B and Al-Ni/B produced during the ball milling process. Their synergistic effect enhances the hydrogen generation performance of Al-InCl 3 -(Ni-Bi-B) remarkably. In general, the proposed Al-InCl 3 -(Ni-Bi-B) composite is possible to serve as hydrogen generation material for fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 5
·2147-2156
·
IF 2.394
Wang Hongqiang,Yang Guangchang,Lai Feiyan,Chu Youqi,Zhang Xiaohui,Ma Zhaoling,Li Qingyu
Ni-rich oxide materials suffer poor rate capability and rapid capacity fading, which seriously hinder its further commercialization. In this study, an ultrathin Al 2 O 3 coating layer on surface of the LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) material was prepared with Al(OC 4 H 9 ) 4 in organic medium; the process followed by heat treatment achieves Al doping. The synergistic effect of surface modification and Al doping significantly enhances the capacity retention and rate performance, while the resistance to moisture is also improved. The coated sample with 2wt% Al 2 O 3 shows superior electrochemical performances with an initial capacity of 175 mAh g −1 at 1 C and a retention of 80% after 500 cycles, which is 10% higher than the uncoated raw materials. In addition, it delivers 152 mAh g −1 at 10 C, suggesting an excellent rate capability. The substitution of Al 3+ and the Al 2 O 3 protective layer facilitates ion diffusion dynamic characteristic and improves electrochemical stability.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 10
·1-12
·
IF 2.8
Ni Hanwen,Zhang Faqiang,He Zichen,Liu Zhifu
The CaTiSiO 5 -based ceramics show promise as dielectric materials for high-temperature MLCC due to their excellent temperature stability which is expected to be improved by co-doping at the A/B sites. In this study, the Dy and Al co-doped CaTiSiO 5 ceramics (Ca 1− x Dy x Ti 1− x Al x SiO 5 , x = 0, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08) were fabricated by the conventional solid-state method. The effects of Dy and Al co-doping on the phase structures, dielectric properties and impedance characteristics, were investigated in detail. CaTiSiO 5 -based ceramics transformed to the paraelectric phase and achieved excellent temperature stability of permittivity by Dy and Al doping, which results from the long-range disorder in the arrangement of Ti displacements within the octahedral chain. Components with x = 0.01 showed linear dielectric response under the electric field. It obtained a high and stable dielectric constant in a wide temperature range ( ε r = 52, TCC ≤ ± 180 ppm/°C over the temperature range from − 55 to 300 °C), low loss (tan δ < 0.07), high breakdown strength (∼ 516 kV/cm) and high DC resistance ( ρ = 3.8 × 10 10 Ω cm at 300 °C).
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Rongzhao Li,Chengtao Zhang,Shuo Li,Yupeng Du
Propane dehydrogenation is commonly operated at temperatures exceeding 600 °C due to thermodynamic requirements. However, high temperature accelerates the deactivation of catalysts because of the coke deposition. Therefore, it is quite necessary to develop catalysts with high catalytic activity and improved anti-coking ability. To this end, an Al-doped Cr 2 O 3 catalyst derived from MIL-101(Cr/Al) is prepared in this work. The preparation conditions, including the carbonization temperature of MIL-101 and the proportion of Cr/Al, are optimized via experimental studies. Meanwhile, the adsorption and dehydrogenation behaviors of propane on the catalyst are investigated using Density Functional Theory (DFT) methods. Findings indicate that the optimum carbonization temperature and Cr/Al proportion are 900 °C and 6:4, respectively. Under the reaction condition of P = 0.1 MPa, T = 580 °C and GHSV = 800 h −1 , the propane conversion and propylene selectivity on the Cr 6 /Al 4 catalyst are 19.5% and 92.0%, respectively. The activity stability of the Al-doped Cr 2 O 3 is elongated significantly due to the lower desorption energy of propene and higher energy barrier for the coke formation on the catalyst. In sum, the present work completed via experiments and DFT calculations will lead to a better understanding of the Al-doped Cr 2 O 3 catalyst and guide the rational design of anti-coking catalysts for propane dehydrogenation.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Guo-chang Song,Xing-yu Yang,Zhong-wei Li,Qiang Song
Arsenic (As) pollutants are highly toxic and using Ca-based minerals to adsorb As 2 O 3 is effective for emission control. In this study, a fixed-bed experimental system was used to study the adsorption of As 2 O 3 by the mixture of CaO, SiO 2 , and Al 2 O 3 at 1200 °C. The amount of As adsorbed by multiple minerals was higher than that by single minerals, indicating enhanced adsorption of As 2 O 3 under the coupling effects of Ca, Si, and Al. The adsorption amount of As first increased and then decreased with an increase in the CaO:(SiO 2 +Al 2 O 3 ) and SiO 2 :Al 2 O 3 ratios. Adsorbed As was mainly enriched in Ca-Si-Al mineral, including Ca 2 Al 2 SiO 7 . Density Functional Theory calculation was conducted to study the As 2 O 3 adsorption on the Ca 2 Al 2 SiO 7 (0 0 1) surface. The analysis of Mulliken charge and density of states showed that As 2 O 3 molecules formed Al-O, O-As, and Ca-O bonds with the Al, O, and Ca sites. Si and Al in Ca 2 Al 2 SiO 7 enhanced the adsorption ability of Ca sites by promoting electron transfer . Si/Al ratio close to 1:1 is conducive to the formation of Si-O-Al structures, thus further enhancing the adsorption. The results can help optimize coal blending strategies and modify adsorbents to further reduce As emissions during coal combustion .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Defence Technology
·
2020
·
IF 2.637
Yue-ting Wang,Xiao-ting Zhang,Jian-bing Xu,Yun Shen,Cheng-ai Wang,Fu-wei Li,Ze-hua Zhang,Jian Chen,Ying-hua Ye,Rui-qi Shen
In this study, Al–CuO nanocomposites were fabricated by sol-gel method. As a contrast, the thermite was prepared by physical mixing at the equivalence ratio of 0.5, 1, 2, respectively. The intermediates and samples as prepared were characterized by SEM and XRD. The exothermic properties of the two samples prepared at different equivalence ratios were tested and the reaction products were characterized by XRD. The SEM results show that the sample prepared by the sol-gel method demonstrates a micron-sized agglomerated sphere formed by a mutual wrapping of Al NPs and CuO NPs, and the particles are evenly distributed in the agglomerate. In addition, when the content of Al powder is seriously insufficient, the heat release of the sample prepared by physical mixing is 1.6 times that of by sol-gel method. With the increase of Al powder content, the exothermic properties of Al/CuO NPs prepared by sol-gel method began to increase significantly compared with physical mixing and the difference is 1.5 times when the equivalence ratio increases to 2. It can be concluded that the reason for this result may be attributed to the different mass transfer modes of components due to the different morphologies of samples.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Miao He,Yuting Xie,Jie Ni,Yan Jian,Shaoyi Song,Hebin Bao,Xuzhong Zeng,Xueming Li,Qihui Wang
In this study, Al/CuO energetic materials with high exothermic properties were prepared by electrophoretic deposition of nano-Al and CuO microboxes on Ti sheets. The microstructure and phase composition of Al/CuO energetic materials were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrophoretic deposition behavior of nano-Al and CuO microboxes were systematically investigated, and the electrophoretic deposition process was controlled by diffusion. The differential scanning calorimetry results showed that the maximum heat released by Al/CuO energetic material is 3049 J/g at an equivalent ratio of 3.0. The combustion properties of Al/CuO energetic materials were tested by optical fiber spectra. When the equivalence ratio was 2.25, the intensity of the spectra of Al/CuO energetic materials were the strongest and the lowest color temperature was 2916 K. This work provides a reference for the preparation of highly exothermic Al/CuO energetic materials by electrophoretic deposition.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 40
·23061-23070
·
IF 3.049
Libo Peng,Qinglong Xie,Yong Nie,Xuejun Liu,Meizhen Lu,Jianbing Ji
The oxidative cleavage of vegetable oils and their derivatives to produce bio-based aldehydes is a potentially useful process, although the aldehyde products are readily oxidized to carboxylic acids and thus seldom obtained in high yields. The present study developed a room-temperature method for the synthesis of bio-aldehydes via the oxidative cleavage of vegetable oil-derived epoxides, using H2WO4 as the catalyst, H2O2 as the oxidant, and t-BuOH as the solvent. Reactions were carried out at temperatures ranging from 25 to 35 °C for 3.5–10.5 h, and provided >99% conversion and >90% aldehyde yield. In particular, an approximately 97% yield was obtained at 25 °C after 10.5 h. As the reaction proceeded, the H2WO4 dissolved to form a W-containing anion. Several mesoporous Al-MCM-41 materials having different Si/Al ratios were hydrothermally synthesized and used as adsorbents to recover the catalyst by adsorbing these anions. The adsorption capacity of the Al-MCM-41 was found to increase with decreases in the Si/Al ratio. The Al-MCM-41 had little effect on the oxidative cleavage reaction at 25 °C, and thus could be directly added to the reaction system. The excellent anion adsorption performance of the Al-MCM-41 greatly improved the reusability of the H2WO4 catalyst. When using the Al-MCM-41 with the best adsorption performance, there was no significant decrease in the activity of the catalyst following five reuses.
研究领域:
化学工程
·
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）