SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
·
IF 6.3
Qingyang Mei,Hui Liu,Jinjia Wei
To address the challenges of structural degradation and low solar absorptivity in calcium-based thermochemical energy storage systems under high-temperature cycling, we propose a novel Mn/Al/Ce ternary-doped CaO composite (Ca10Mn1Al1Ce1) optimized for solar-driven calcium looping applications. Through a sol-gel synthesis strategy, the co-doping strategy synergistically integrates structural stabilization mediated by Ca 2 MnO 4 /Ca 3 Al 2 O 6 frameworks, carbonation kinetics enhancement through CeO 2 -induced oxygen vacancies, and Mn element doping, significantly improving the material's solar energy absorption performance. The optimized material demonstrates unprecedented cycling stability with only 5.6 % energy density decay over 200 cycles, outperforming pure CaO (73.5 % degradation after 100 cycles). Kinetic analysis reveals accelerated calcination rates enabled by Mn doping, while DFT calculations confirm an 18.3 % reduction in CaCO 3 decomposition energy barriers. Remarkably, the composite achieves a 3.9-fold enhancement in solar absorptivity through synergistic full-spectrum light harvesting. This work establishes a multifunctional doping strategy that simultaneously addresses sintering resistance, solar absorptance, and reaction kinetics, offering a promising pathway for next-generation concentrated solar power plants requiring high-temperature, long-cycle thermochemical energy storage.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoyang Wang,Jianguo Huang,Hao Feng,Jinfeng Li,Zidie Pu,Xiangchun Yin
The hierarchical architecture constitutes one of the key factors affecting the performance of microwave absorbing materials (MAMs). Herein, core-shell Fe 3 O 4 with a dendritic hierarchical structure is fabricated successfully by the melting method in a SiO 2 -B 2 O 3 -Al 2 O 3 -CaO-Fe 2 O 3 multi-component system. The multiple transmission scattering absorption mechanism is mediated by the unique microstructure, thus improving the impedance matching and the microwave loss ability of the material. According to its reflection loss curve, the microwave absorption was efficiently optimized, yielding a minimum reflection loss (R L ) of − 54.26 dB when the thickness was 3.47 mm, and the effective bandwidth (R L <10 dB) for electromagnetic wave reflectance reached 3.28 GHz (6.48–9.76 GHz) with a sample thickness of 1.8 mm. The present work adds new useful information for the designing of high-performance glass-ceramic MAMs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haiming Gu,Xuxing Shen,Minyu Yu,Miaomiao Niu,Shanhui Zhao,Siwen Zhang,Xiaolong Bi,Yadong Yu,Mofei Zhong,Lianggan Guan
Sorbent looping dry reforming of methane (SLDRM) represents a promising approach for CO 2 emission reduction and resource utilization, with its advancement hinging on the development of dual functional materials (DFMs) capable of simultaneous CO 2 capture and catalytic methane conversion. In this study, CaO-Ni based DFMs supported on various materials were synthesized via sol–gel method and characterized using SEM, XRD and TGA. Isothermal SLDRM experiments were performed in a fixed bed to evaluate the performance of these materials. Initial screening of support materials revealed that CH 4 conversion activity followed the order: CeO 2 >Al 2 O 3 >La 2 O 3 >MgO ≈ Y 2 O 3 , with CeO 2 emerging as the optimal support due to its superior performance. The synergistic effect of the Ni catalyst and CH 4 atmosphere significantly enhanced low-temperature decarbonization of the sorbent, mitigating sintering and enhancing cyclic CO 2 capture capacity. In-situ CO 2 conversion during CH 4 reforming disrupted the decarbonization reaction equilibrium, enabling efficient isothermal CO 2 capture and decarbonation. Ni decoration significantly enhanced CH 4 conversion, increasing from nearly 0% without Ni to 87% at 10% Ni loading, while higher loadings provided only marginal improvements. Although an increase in reaction temperature enhanced CH 4 conversion, it also increased CO 2 partial pressure, promoting the reverse water gas shift reaction and resulting in a H 2 /CO ratio below 1 when the temperature exceeded 650°C. Stability tests over 10 consecutive SLDRM cycles demonstrated good stability of CaO-10Ni/CeO 2 , maintaining a CH 4 conversion efficiency of 87% and a stable H 2 /CO ratio of approximately 1 at 650°C. Carbon deposition during the CH 4 step was effectively removed during carbonation, as confirmed by Raman spectroscopy, while SEM and XRD analyses revealed preserved surface morphology and phase composition. These findings highlight the excellent reactivity and stability of CaO-10Ni/CeO 2 , positioning it as a highly promising candidate for advancing CO 2 emission reduction and resource utilization strategies.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Shuo Tian,Hao Yang Shen,Jun Jie Huang,Hao Zhang,Kai Ge Liu,Bin He,Jianwei Zhao,Ling Bing Kong
When preparing glass-ceramics using sintering method, porosity is the main reason affecting their properties. To achieve glass-ceramics with low thermal expansion performance, cold isostatic pressing is adopted to significantly reduce the porosity. In this study, we systematically analyzed the effect of CaF 2 /CaO content on sintering behavior, microstructure and properties of Li 2 O–Al 2 O 3 –SiO 2 (LAS) glass-ceramics. It was found that the [CaF 2 ]/([CaO]+[CaF 2 ]) ratio x can be used to regulate the coefficient of thermal expansion (CTE) of the LAS glass-ceramics. The optimized sample has a CTE of 2.2865 ppm/°C, which is compatible with that of silicon (2.5 ppm/°C). At the same time, low dielectric constant (5.95 ≤ ε r ≤ 8.89) and dielectric loss (1.179 × 10 −3 ≤ tanδ ≤2.871 × 10 −2 ) were observed, which makes them a promising candidate for low-temperature co-fired ceramic substrate applications.
研究领域:
材料科学
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陶瓷工程
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电气工程
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Qi Li,Jianliang Xie,Jin Hu,Xin Wang,Chengyong Yu,Shaoliang Jiang,Peng Liu,Chengli Sun,En Li,Longjiang Deng
The dielectric layer plays a key role in regulating electromagnetic wave broadband scattering based on meta-surface technology. Herein, the physical properties of composite powder, prepared by spray drying of CaO-B 2 O 3 -SiO 2 (CBS) glass-ceramic powder and Al 2 O 3 in different mass ratios, are systematically investigated. Meanwhile, a high enthalpy atmospheric plasma spraying equipment is utilized to prepare CBS/Al 2 O 3 composite coatings , and the morphology, physical properties and dielectric properties of the composite coating are analyzed. The XRD and DSC data of the composite coating reveal that the crystallization behavior of β-CaSiO 3 and CaB 2 O 4 gradually disappear with the increase of Al 2 O 3 content. Hence, only CaAl 2 Si 2 O 8 phase is observed during heat treatment. The experimental results confirm that the dielectric properties of CBS/Al 2 O 3 composite coating conform to the rule of mixture for composite materials. Also, the dielectric properties are affected by porosity and crystallization rate.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 12
·5540-5550
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IF 3.591
Qiang Wei,Gang Zhang,Jie Yao,Xuejun Chen,Gongying Wang,Xiangui Yang
Dimethyl carbonate (DMC) is well known as an extremely industrially valuable substance. The demand for high-efficiency synthesis of DMC has greatly driven the exploration of novel catalysts and their low-cost preparation methods. Herein, a novel method for the rapid batch preparation of CaO/carbon catalysts using calcium citrate (CaCi) was provided, and these catalysts were used to catalyze the transesterification reaction of methanol and ethylene carbonate (EC) to synthesize DMC and ethylene glycol (EG). Accordingly, the structure and properties of the catalysts were characterized using XRD, FTIR, N2 adsorption–desorption, TG, TG-IR, CO2-TPD, XPS, SEM, TEM and ICP-OES techniques. Meanwhile, the effect of various process conditions such as carbonization temperature, reaction temperature, reaction time and catalyst amount has been extensively evaluated. Under the optimal process parameters, the conversion of EC and the selectivity of DMC and EG were 81.2, 99.3 and 99.5%, while the turnover number (TON) and turnover frequency (TOF) were 54.1 and 162 h−1, respectively. Furthermore, kinetic analysis was carried out, and the value of k (reaction rate constant) was ≈0.159 mol L−1 min−1. The reusability was also investigated.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
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IF 6
Zhuoqing An,Xiaolong Ni,Zhuang Ma,Yuan Gao,Jiajing Chen
To investigate the effects of La 2 O 3 and Fe 2 O 3 on the structure and high viscosity of the CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass system, the microstructure was analyzed using in-situ high-temperature Raman spectroscopy, and the viscosity was measured by high temperature hot-stage. A series of cluster models representing aluminosilicate systems modified by La and Fe ions were constructed, followed by geometric optimization and Raman spectral simulation via quantum chemistry ab initio calculations. The results indicates that the effects of La 2 O 3 and Fe 2 O 3 on both vibrational wavenumber and Raman scattering cross-section (RSCS) followed the order: La < (La + Fe) < Fe. The addition of La 2 O 3 and Fe 2 O 3 loose the glass network structure, and led to a progressive rise in the relative content of Q 0 , Q 1 , and Q 2 units, accompanied by a notable decrease in Q 3 and Q 4 units. Consequently, the high viscosity and viscous flow activation energy decrease with the addition of La 2 O 3 and Fe 2 O 3 , but Fe 2 O 3 has a more pronounced effect. Furthermore, based on the NBO/T for characterizing the microstructure, the relationship between viscosity and microstructure is quantitatively analyzed.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2023
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IF 6
Jida Wang,Zhangshuai Ding,Feng Shi,Yifei Chen,Defa Hou,Fulin Yang,Can Liu,Yi Lu,Xu Lin,Zhifeng Zheng,Yunwu Zheng
An efficient and highly selective CaO-MgO-promoting γ-Al 2 O 3 decarboxylation catalyst was fabricated with different CaO to MgO ratios via a ball-milling method for regulating product distribution and production of gasoline-kerosene-diesel hydrocarbons via the catalytic copyrolysis of oleic acid (OA) and methanol under hydrogen-generating conditions. In addition, influencing factors, reaction mechanisms, possible reaction pathways and deactivation mechanisms were probed. The results showed that combining Ca, Mg and AlOx was vital for boosting oleic acid conversion, and synergy between metal and acid active sites via strong metal-support interactions enhanced deoxygenation-cracking activity. High-alkalinity CaO boosted C-C/C C bond cleavage, and MgO provided medium-strength Lewis acid sites; additionally, a large BET surface area and mesopore volume suppressed excessive hydrocracking reactions, improving biogasoline yield. Methanol addition provided active hydrogen atoms to enhance biogasoline selectivity at the expense of diesel and heavy oil production via olefinic cycles and aromatic cycle mechanisms and reduced coke deposition. The maximum hydrocarbon and biogasoline yields of 94.53% and 57.59% were achieved at OA/methanol= 5:1 and pyrolysis/catalytic temperature= 450/500 °C with1 g catalyst at a feedstock input rate of 0.1 ml/min.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Hao Liu,Yaji Huang,Huikang Song,Tianhang Tang,Hao Shi,Lang Kai,Chenlu Yang
A novel pathway for the co-disposal of municipal solid waste incineration fly ash (MFA) and bottom slag (BS) with waste glass (WG) was proposed. Combined melting experiments and theoretical calculation were employed, which revealed the structural evolution of the CaO-Fe₂O₃-SiO₂ system and the underlying mechanisms of heavy metal immobilization. It was demonstrated that stable glassy products were obtained within a CaO/(Fe₂O₃+SiO₂) mass ratio ( M C / ( SF ) ) range of 0.13~0.41. The leaching concentrations of heavy metals in these vitrified products were suppressed to the relevant regulatory standards. With an increasing M C / ( SF ) , the glass network became more depolymerized, as evidenced by a higher population of low-connectivity Qⁿ units in the structure. However, under Fe₂O₃-enriched system, the Fe coordination shifted from solely tetrahedral [FeO₄] towards a mixed tetrahedral/octahedral environment. Moreover, Pb and Cd were incorporated into the glass matrix via interstitial doping. The depolymerized network dominated by CaO favored the Pb enrichment. Cd tended to be stabilized in the Fe-rich structure, facilitated by the formation of highly localized Cd-O bonds. This study elucidated the coupling effects of oxide composition on glass structure and heavy metal immobilization behavior, providing a fundamental theoretical basis for understanding and optimizing the vitrification process for solid waste treatment.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Bingbing Liu,Yubi Wang,Li Zhang,Bei Zhang,Jia Wang,Yuanbo Zhang,Guihong Han
Ferrites with a typical AB 2 O 4 structure are excellent soft magnetic material precursors . One progress for preparation of manganese ferrite is to use the minerals as raw materials. However, the inclusive impurities, such as Ca and Si, may dope in the AB 2 O 4 structure and have an adverse effect on the magnetism of ferrites. In this work, the effects of CaO and SiO 2 on the crystalline structure transformation, interfacial elements distribution, and magnetism change of the MnO 2 -Fe 2 O 3 -CaO-SiO 2 system for preparation of high-performance ferrite materials were systematically investigated. It's found that Ca ions can readily be doped in the sit A of spinel-type structure to form Ca a Mn b Fe 2 O 4 , and the magnetism of manganese ferrite was observably declined due to the Ca doping. A diffusion couple of synthetic Ca a Mn b Fe 2 O 4 and SiO 2 was designed to determine the Ca migration. Results demonstrated that regulation of Ca out of sit A from the spinel-type structure can be successfully realized via adjusting the CaO/(CaO + SiO 2 ) mass ratio below 0.55, and the magnetism of ferrite after Ca migration was obviously enhanced. The migrated CaO combined with SiO 2 to form calcium silicate which was distributed at the boundaries of ferrite particles. Eventually, the verification test of low-grade manganese ores with CaO and SiO 2 impurities was conducted to validate the Ca migration effect.
研究领域:
材料科学
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磁性材料
·
矿物加工
·
固态化学
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