CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanqiu Jing,Tingsong Li,Zhenzhen Zhou,Chen Hu,Maxim Ivanov,Dariusz Hreniak,Jiang Li
High quality and fine grained 4.5 at.% Sm:YAG transparent ceramics were fabricated by vacuum pre-sintering and hot isostatic pressing (HIP) from the co-precipitated nano-powders. After component optimization, the Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = 0.005) transparent ceramics have the highest in-line transmittance. Alumina secondary phase was observed in the Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = −0.001, 0) ceramics. The Sm 0.135 Y 2.865(1+x) Al 5 O 12 (x = 0.001, 0.003, 0.005, 0.007) ceramics showed clear microstructures because of the yttrium ions anti-site defects (Y 3+ in Al 3+ positions) forming. By optimizing the pre-sintering temperature to 1450 °C, the 4.5 at.% Sm:YAG transparent ceramics with the thickness of 2.0 mm achieved a high in-line transmittance of 84.1 % at 808 nm after HIP post-treatment at 1550 °C for 3 h. Fine grain size of 730 nm and appropriate absorption coefficient of 2.94 cm −1 at 1064 nm were also achieved. It is indicated that the 4.5 at.% Sm:YAG transparent ceramics could effectively suppress amplified spontaneous emission and parasitic oscillation as a cladding layer of the high power Nd:YAG ceramic lasers. The co-precipitation method for synthesizing 4.5 at.% Sm:YAG nano-powders were reported in detail, and fine-grained transparent ceramics were fabricated.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Jiawen Hu,Linwen Jiang,Hang Liu,Jiawei Jin,Anhua Wu,Xiaofeng Zhang
High entropy alloys (HEAs) show great potential in electromagnetic-wave absorption (EMA), but impedance matching and environmental stability are still difficult problems to solve. Solid-solution strengthening is an effective means to enhance the performances of EMA materials. The multi-element co-penetrated FeCoCrMn HEAs are prepared using urea (CH4N2O) as the multi-element source by a green mechanochemical approach. The phase structure, magnetic properties, corrosion and oxidation resistance, and EMA properties of HEAs are investigated in detail. The results show that the crystal structure of HEAs is significantly altered by multi-element introduction. It is noteworthy that Ms is significantly enhanced on increasing the multi-element co-penetration level. The dielectric loss and magnetic loss of HEAs are significantly enhanced to optimize the impedance matching and attenuation properties, so as to achieve excellent EMA performances. Multi-element co-penetrated FeCoCrMn HEAs achieve a reflection loss (RL) of −59.6 dB at 6.06 GHz while achieving an ultra-wide effective absorption bandwidth (EAB) of 6.86 GHz at 1.32 mm. In addition, HEAs exhibit excellent corrosion resistance, indicating suitability in harsh environments. This study provides a new strategy for the design of highly effective EMA materials.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Meina Tan,Yang Qin,Jiaxin Luo,Yiping Wang,Fazhi Zhang,Xuhui Zhao,Xiaodong Lei
Aqueous hybrid-ion batteries (AHBs) offered various advantages, including low cost, high energy density, high operation voltage, safety, and durability. These characteristics made them an attractive choice for energy storage devices. CuS was a high-capacity cathode material for Al storage. However, the rate performance of CuS under high-voltages conditions was not satisfying. Here, we prepared Co-doped CuS (Co-CuS) nanosheet material with the small band gap by using the ball milling method as the cathode material of aqueous Cu-Al hybrid-ion battery. Co doping can improve the electron transport capacity and provide more active sites. At high current density, Co doping enhances the electrochemical kinetics, operating voltage and electrochemical performance of the materials. The battery exhibits a capacity of 175 mAh g -1 at 2000 mA g -1 and 108 mAh g -1 at 4000 mA g -1 . After 200 cycles of charge and discharge tests, a capacity of 93 mAh g -1 remains. This offers a valuable approach to the development of aqueous Cu-Al hybrid-ion battery electrode materials with good electrochemical performance under high operating voltage and high current conditions.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fengli Yang,Yi Su,Guangpin Lin,Jiawang Liu,Feifei Xia,Guobin Liang,Wei Lin,Huabing Zhang
Photocatalytic nitrogen fixation presents a promising alternative to the traditional Haber-Bosch process. In this study, Fe/Br co-doped bismuth molybdate (Fe/Br-BMO) was synthesized for the photocatalytic production of ammonia, achieving a production rate of 156.7 µmol g −1 h −1 . Characterization of the catalyst reveals that Fe/Br co-doping not only modifies the energy band structure and electronic properties of the catalyst but also expands the light absorption spectrum, inhibits the rapid recombination of photogenerated charge carriers, and increases both the specific surface area and the number of oxygen vacancies within the catalyst, which promote N 2 adsorption and activation and a significant reduction in the free energy of the rate-limiting step. These improvements effectively facilitate the adsorption and activation of N 2 molecules, lower the Gibbs free energy associated with the rate-limiting step, and ultimately enhance the photocatalytic activity
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Yao Tong,Tianhua Yang,Jian Wang,Bingshuo Li,Haijun Zhang,Rundong Li
Hydrodeoxygenation (HDO) of lignin-derived phenolic compounds plays a crucial role in the production of renewable biofuels. In this regard, a series of different Co@NC catalysts were prepared with ZIF-67 as a sacrificial template by modulating the catalyst pyrolysis temperature and used for the catalytic hydrodeoxygenation of lignin-derived phenolic model compound 4-ethylphenol for the preparation of cyclohexanols/ cyclohexanes. The results showed that the low-temperature pyrolysis will retain a large number of CoO x compounds, which led to a high dispersion of Co. For Co@NC catalysts, the uniformly dispersed Co component facilitated the adsorption and transfer of hydrogen, and the exposed surface of the carrier promoted the adsorption of reactants. The pyrolysis temperature also played a crucial role in the differences in catalyst crystal surface, specific surface area, acid strength distribution and oxygen vacancies. Co@NC catalyst prepared at 600 °C has a stronger hydrogen absorption capacity, the largest specific surface area and a higher number of oxygen vacancies. Therefore, the Co@NC-600 catalyst showed the best HDO activity. Under the mild conditions (220 °C, 2.5 h and 3 MPa H 2 ), the conversion of 4-ethylphenol was close to 100 %, and the selectivities of 4-ethylcyclohexanol and ethylcyclohexane were 62.7 % and 10.8 %, respectively.
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Yulai Lin,Jun Liang,Zijun Huang,Jiaming Dong,Yongming Luo,Dedong He
Cobalt-based catalysts have garnered significant attention in propane dehydrogenation (PDH) due to their cost-effectiveness and environmental compatibility, where the properties of Co species dictate catalytic performance. However, conventional synthesis methods fail to simultaneously achieve precise encapsulation and structural stabilization of Co sites under harsh PDH conditions. Herein, we propose an innovative dual-anchoring strategy that synergizes strong electrostatic adsorption (SEA) and secondary crystallization (SC) to engineer highly stable yet active Co centers at low metal loadings (0.145 wt%). The SEA process enabled directional anchoring of Co precursors within silanol nests of dealuminated BEA zeolite, while SC treatment prevented Co aggregation. This synergistic approach yielded tetrahedral Co²⁺ (Td-Co²⁺) sites with exceptional dispersion and optimized Lewis acidity, achieving stable PDH operation for 110 hours with specific activity surpassing most reported catalysts.
✓ 已验证
产品关联
DOI
高影响因子
EES Catalysis
·
2025
·
IF 8.1
Jie Yang,Lifang Chen,Xuya Zhu,Wenwen Shi,Mengxue Huang,Chang Liu,Ruimin Ding,Lin Gan,Xi Yin
H2O2 -related electrochemical reactions, including two-electron oxygen reduction reaction (2e-ORR), H2O2 oxidation reaction (HPOR), and H2O2 reduction reaction (HPRR), have received significant attention for the electrosynthesis H2O2 and energy storage. Understanding the complex structure-activity relationships among 2e-ORR/ HPOR/HPRR and their connections is crucial for further developing highly efficient catalysts and working systems. Herein, we unveil these intricacies by employing model Co-N-C catalysts with well-defined active site configuration (Co-N4-pyrrolic and Co-N4- pyridinic ) in a combined experimental and computational approach. We report the higher 2e-ORR/HPOR but lower HPRR activity of CoN4-pyrrolic site than the CoN4-pyridinic site based on their reaction free energy landscapes remodeled considering the chemisorption steps of O2 and H2O2 . The results reveal that the binding free energy of *OOH (ΔG*OOH ) can only be utilized as a reliable descriptor for 2e-ORR/HPOR activity, but not indicative of HPRR activity, regardless of the scaling relationship of the common reaction intermediates ( *OOH or *OH). The HPRR activity of CoN 4 sites strongly depends on the H2O2 adsorption strength and configuration. These findings provide valuable insights into the design of catalysts for H2O2 -related electrochemical energy conversion and storage systems.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Huiying Zuo,Kaibin Chen,Hong Zhai,Jiao Dong,Daping Quan,Jing Zhou,Ying Bai
Self-assembly of block copolymers (BCPs) in selective solvents often provides promising routes for fabrication of morphologically rich microcarriers. Herein, a sort of lamellar platelet-like structure has been obtained through co-assembly of amphiphilic diblock polycarbonates and certain species of small molecules. The diblock copolymer consisted of a hydrophobic segment with pendent cholesterol groups and a hydrophilic block decorated with branched polyethylenimine groups, synthesized by sequential ring-opening polymerization. Planar drug molecules (such as curcumin, coumarin, and steroids) served as the nuclei that facilitated crystallization of hydrophobic block of copolymer chains with pendent cholesterol groups. Such small-molecule-mediated crystallization can force the copolymer chains to be fully stretched and packed in an orderly fashion, inducing the co-assembly of the diblock polycarbonate and cargo molecules, rather than the BCP self-assembly driven by solvent-philic/solvent-phobic interaction. The thickness of the co-assembled platelet was highly dependent on the chain length (degree of polymerization) of the copolymer, as well as the layer numbers of the stacking lamellae. Furthermore, such platelet-like co-assemblies effectively reduced the dosage-dependent cytotoxicity of curcumin. Overall, we herein propose a novel mechanism for small molecule induced macromolecular assembly and well-controlled morphological modulation through layer-by-layer stacking, which holds great potential for drug delivery in versatile biomedical applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiwen Lin,Zhongyao Zhang,Jiaye Qiu,Yujie Wu,Jun Yu,Yongliang Li,Xiangzhong Ren,Lei Zhang,Zhongxin Song
Pt-based catalysts are widely used in hydrogen oxidation reaction (HOR) for the anode of proton exchange membrane fuel cells (PEMFCs). However, high Pt loading and CO poisoning increase the overall cost and stringent requirements for fuel purity. Here, decreasing Pt usage while achieving high anode performance by anchoring Ni single atoms under or adjacent to Pt nanoclusters is studied. The electron interaction between oxophilic Ni single atoms and Pt nanoclusters is beneficial for optimizing the electrocatalytic HOR. The Pt-Ni SA /CNT-2.6 (CNT-carbon nanotube) catalyst with 2.6 wt% low Pt loading shows superior catalytic activity for the HOR, long-time stability, and good CO-tolerant performance in the liquid half-cell and fuel cell of membrane electrode assembly (MEA). Theoretical calculations reveal that the synergy between single atoms and nanoclusters optimizes the d band of Pt and decreases the activation barrier for HOR and CO stripping, thereby enhancing HOR activity and high CO tolerance in PEMFC anodes with a low Pt loading. This work provides a novel design of electron interactions between single atoms and Pt nanoclusters, showing a significant advantage in promoting low-Pt PEMFCs with high power and CO tolerance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Teng Lu,Zhaomin Li,Liping Du
Inherent obstacles of hydrogen injection encompass preferential channeling through larger pathways, hampering microscopic sweep efficiency within porous media. This work pioneers hydrogen foam generation via co-injection with aqueous sodium dodecyl sulfate (SDS) to enhance subsurface hydrogen trapping capacity. SDS addition substantially reduces hydrogen-water interfacial tension and enhances viscoelasticity. In contrast to robust hydrogen foam stability, CO 2 foams display compromised integrity, stemming from surfactant aggregation and ensuing infiltration channels that permit aqueous phase CO 2 dissolution. Hydrogen foams conversely sustain uniform surfactant films, forestalling hydrogen ingress into water. Synergetic microfluidic and pore-scale simulations visualise mechanisms underlying intensified hydrogen capture and mobility reduction attributed to deformation and flow resistance when traversing constricted pores. Introducing the amphiphilic SDS surfactant considerably promotes hydrogen adsorption through its hydrophobic tail. Core flooding experiments quantify over 2 times hydrogen storage ratio amplification with SDS relative to sole hydrogen injection. The framework contributes pragmatic strategies to harness high-efficiency hydrogen foam for scalable clean energy storage.
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Bang Wu,Xin Guo,Xulinjia Liu
The effect of calcium on the synergy evolution mechanism of Zhundong coal and polyethylene (PE) co-pyrolysis was explored by thermogravimetric (TG), fixed-bed experiments, and the ReaxFF simulation method. The weight loss characteristics of coal and PE pyrolysis, obtained through ReaxFF simulations, exhibited good agreement with TG experimental results. The distribution of coal/PE co-pyrolysis products was examined via fixed-bed fast pyrolysis experiments and Reaxff isothermal pyrolysis simulation. The results reveal that calcium substantially reduces co-pyrolysis tar while simultaneously enhancing co-pyrolysis char and gas to varying extents. Besides, the experimental temperature of 973 K and the simulated temperature of 2600 K yield the highest decrease in co-pyrolysis tar, with reductions of 9.52 % and 14.03 %, respectively. It is discovered that the addition of calcium enhances the synergy degree to 100 % between coal and PE molecules, which means that coal molecules become more firmly attached to PE molecular fragments. Additionally, calcium induces polymerization in co-pyrolysis char, causing the char molecules to become larger and increasing their average molecular weight. Ca-containing tars are rich in aliphatic hydrogens, and synergistic molecules prefer light tars, whereas Ca-free tars have a slightly broader range of aromatic hydrogens, and synergistic molecules favor heavy tars, indicating that the addition of calcium may promote the ring-opening process of coal molecules, releasing more branched-chain hydrogen. In the Ca-free and Ca-containing systems, 24.67 % and 29.51 % of the hydrogen content of the coal molecules migrated toward the co-pyrolysis tar, respectively. The proportion of coal tar fragments decreases while the proportion of PE tar and synergistic tar fragments increases in Ca-containing tar when compared to Ca-free tar, indicating that calcium promotes the polymerization of coal tar molecules with PE tar molecules, which leads to larger char molecules and smaller gas molecules.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Hong-yan Wu,Wen-kai Wu,Bo Chen,Qiao-ping Kong,Jian-jun Lian
The gradual increase of antibiotics and heavy metals in aquatic environments poses a serious threat to human health and ecosystems, and finding effective methods for simultaneous removal of antibiotics and heavy metals has attracted increasing concern. In this study, a novel porous structure of thiourea-modified sodium alginate microspheres (UA-Ca) was synthesized by modification with thiourea, epichlorohydrin, and calcium chloride, and was applied for the simultaneous removal of tetracycline (TC) and Cu(II) from water. The results indicated that the UA-Ca material with 1:2 mass ratio of thiourea and sodium alginate showed the highest removal of TC and Cu(II) under the reaction condition of pH= 7. The removal process of both TC and Cu(II) follows the pseudo-second-order adsorption model and Langmuir isotherm model. UA-Ca had a high adsorption capacity toward TC and Cu(II) with the maximum value of 1.099 mmol/g and 2.793 mmol/g based on the Langmuir model at 298 K, respectively. Thermodynamical parameters revealed that TC and Cu(II) adsorption is spontaneous with endothermic nature. Competing ionic cations (Ca 2+ 、Mg 2+ 、NH 4 + ) and organics (sulfamethoxazole, hygromycin) had a certain inhibitory effect on the removal of TC and Cu(II) by UA-Ca, whereas the anionic ions (CO 3 2- 、PO 4 3- 、SO 4 2- ) all had little effect on its removal. Fourier transform infrared spectra and X-ray photoelectron spectroscopy analyses showed that the removal of TC and Cu(II) by UA-Ca was mainly due to electrostatic adsorption and surface complexation. This work provides a promising UA-Ca material for the effective removal of TC and Cu(II) in contaminated water.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）