Energies
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2024
·Vol. 17
·期 2
·474
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IF 3
Xiao Yang,Yuqi Ji,Haoyan Zhang,Bin Liu
Tetrabutylammonium bromide (TBAB) is considered a promising alternative cold energy storage material. Due to the high dissociation heat of phase transition at an atmospheric pressure of 278–293 K, which reaches 200–500 kJ/kg, this substance is considered an effective cold energy storage medium for air conditioning systems. In this paper, the cold storage crystallization process of TBAB solution with different concentrations was tested by conducting experiments and the phase transition’s temperature and latent heat were measured. Finally, the growth characteristics of TBAB hydrate crystals with different concentrations (10%, 20%, 30% and 40%) were analyzed. Considering the cold storage temperature, phase transformation temperature and latent heat, the cold storage effect is the best when 40% TBAB solution is used. Although single substance phase change materials have a long service life, they have problems with low thermal conductivity and high undercooling. Therefore, researchers usually improve the performance of phase change materials by adding other auxiliary materials, thereby enhancing their application prospects. Among these auxiliary materials, adding nano additives to phase change materials can significantly improve latent heat, thermal conductivity and nucleation ability, while also reducing undercooling. Therefore, we studied the influence of different nano-additives (Al2O3, SiC, TiO2and ZnO) on phase change materials. The composites with excellent properties were screened by cooling step cooling curve and differential scanning calorimeter (DSC). Compared with pure TBAB solution, the phase transition latent heat of the composite phase change materials (PCMs) prepared by adding nanoparticles were significantly increased. The results show that adding nano-SiC into 40% TBAB solution can obtain better performance. This work not only provides reference for the further research, but also a sight to design the phase change materials for the application of new phase change cold storage materials.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Peng Gong,Xiangyu Xu,Weiguo Chen,Fei Liu,Pan Guo
This study reports a novel strategy to fabricate phase change composites (PCCs) by integrating polydopamine (PDA)-modified ultrafine silicon carbide (SiC) with copper nanosheets (CuNSs) in paraffin wax (PW). The PDA coating (10–20 nm) on SiC forms a conjugated aromatic layer for enhanced solar-light absorption, while two-dimensional CuNSs construct a continuous thermal-conductive network.” The results show that the thermal conductivity of the optimized PCCs reaches 3.9 W m −1 K −1 (16.3-fold improvement over pure PW), and the solar-thermal conversion efficiency achieves 88.9 % due to the synergistic effect of PDA's light absorption and CuNSs' localized surface plasmon resonance. Additionally, the mass retention rate of PCCs at 80 °C is 99.5 %, demonstrating excellent shape stability. This work provides a multi-functional strategy for improving energy storage performance, holding potential for applications in solar-integrated building systems and thermal management.
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Journal of Energy Chemistry
·
2024
·
IF 14
Ming-Hao Guan,Hao-Nan Xu,Jin Liu,Tao Wu,An-Hui Lu
Regulating the intermediates involved in the electrocatalytic nitrate reduction reaction (NO 3 RR) is crucial for the enhancement of reaction efficiency. However, it remains a great challenge to regulate the reaction intermediates through active site manipulation on the surface of the catalyst. Here, a family of n %-Co 3 O 4 /SiC ( n = 5, 8, 12, 20) catalysts with a delicate percentage of Co 2+ and Co 3+ were prepared for NO 3 RR. We found that Co 3+ primarily acts as the active site for NO 3 − reduction to NO 2 − , while Co 2+ is responsible for the conversion of NO 2 − to NH 3 . Moreover, the conversion of these intermediates over the active sites is autonomous and separately controllable. Both processes synergistically accomplish the reduction of nitrate ions to synthesize ammonia. Combining the experimental studies and density functional theory (DFT) calculations, it is discovered the pathway (*NHO→*NHOH→*NH 2 OH→*NH 2 →*NH 3 ) is more favorable due to the lower Δ G value (0.25 eV) for the rate-limiting step (*NO→*NHO). The NH 3 yield rate of 8%-Co 3 O 4 /SiC reached 1.08 mmol/(cm 2 h) with a Faradaic efficiency of 96.4% at −0.89 V versus the reversible hydrogen electrode (RHE), surpassing those of most reported non-noble NO 3 RR catalysts. This strategy not only provides an efficient catalyst for NO 3 RR but also serves as an illustrative model for the regulation of multi-step reaction intermediates through the design of distinct active sites, thereby presenting a new approach to enhance the efficiency of intricate reactions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Jing Zhao,Jiahao Yang,Jiangpeng Qu,Zijin Cheng,Yujun Liu
To address the issues of insufficient structural stability, poor durability and performance degradation in conventional photothermal anti-icing coatings, a laser etching–electrodeposition synergistic strategy was proposed to fabricate an Al-Myristate@CNTs superhydrophobic photothermal anti-icing coating. First, microporous array structures were constructed on the aluminum substrate surface via laser etching to enhance interfacial mechanical interlocking and provide stable structural support. Subsequently, carbon nanotubes were uniformly incorporated into the micro/nano hierarchical structures through electrochemical deposition, enabling synergistic enhancement of surface wettability, photothermal performance and structural stability. The effects of hydrochloric acid etching conditions, laser scanning speed and carbon nanotubes content on the surface morphology, wettability and multifunctional performance of the coating were systematically investigated. The results demonstrated that the optimized coating exhibited excellent comprehensive performance, with a water contact angle of 157.6° and an abrasion resistance distance of up to 1000 cm, indicating outstanding superhydrophobic stability and mechanical durability. Under 1 sun irradiation, the surface temperature of the coating rapidly increased to 51.6 °C, demonstrating its efficient photothermal conversion capability. Moreover, in a −15 °C environment, the coating achieved an icing delay time of 438 s and reduced the deicing time to 352 s, indicating remarkable anti-icing and photothermal deicing performance. Mechanistic analysis revealed that the incorporation of an appropriate amount of carbon nanotubes facilitated the formation of a uniform and stable hierarchical micro/nanostructure, which enhanced air-pocket stability, solar absorption, and structural integrity, thereby synergistically improving the superhydrophobicity, photothermal performance and long-term durability of the coating. This work provides a novel strategy for the design and fabrication of highly stable multifunctional photothermal anti-icing coatings and offers important guidance for their potential applications in aerospace, energy infrastructure, and transportation systems. Download: Download high-res image (164KB) Download: Download full-size image
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COMPOSITES COMMUNICATIONS
·
2026
·
IF 8.6
Lulu Diao,Zhaobo Tian,Shaobo Zhang,Zhaorui Li,Jian Zhao,Zhanglin Chen,Jie Zhang,Lu Liu,Xiang Li
Engineering hierarchical mesopores in SiC/C microspheres via selective oxidative etching for tuned pore architecture. • Achieving near-electrical-insulation (2 wt% carbon) without sacrificing Ku-band absorption performance. • Realizing an exceptional RL min of −37.21 dB and ultrabroad EAB of 4.55 GHz at merely 2.4 mm thickness. • Demonstrating that mesopore architecture reconciles the impedance matching-attenuation trade-off in lightweight absorbers. Ku-band (12-18 GHz) satellite communications and high-resolution radar demand electromagnetic wave (EMW) absorbing materials that integrate strong absorption, broad bandwidth, light weight, and electrical insulation. Carbon and silicon carbide (SiC) are attractive candidates due to their low density and complementary loss mechanisms—conduction loss and dielectric loss, respectively. However, conductive carbon absorbers suffer from poor impedance mismatch, whereas insulating SiC lacks sufficient dielectric loss. Simply mixing the two phases does not fundamentally resolve this trade-off. Herein, we advance beyond composition tuning by engineering a porous architecture. SiC/C microspheres were fabricated via carbothermal reduction followed by selective oxidation etching, using porous carbon spheres as templates. This post-treatment reduced the carbon content from ∼40 wt% to ∼2 wt% and simultaneously transformed the microporous architecture into a highly interconnected mesoporous network (81.18% mesopore ratio). The resulting material exhibits near-insulating behavior while delivering exceptional Ku-band absorption: a minimum reflection loss of −37.21 dB and an effective absorption bandwidth of 4.55 GHz (covering 11.05–15.6 GHz, most of the Ku-band) at a thickness of 2.4 mm. This work demonstrates that mesopore engineering effectively reconciles the attenuation-impedance matching trade-off, offering a novel path toward lightweight, insulating, and high-performance EMW absorbers for Ku-band applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Changyin Ke,Hanwen Jiang,Zhen Hong,Tonghua Peng,Mingshan Xue
Polytetrafluoroethylene (PTFE) is an excellent candidate for superhydrophobic coatings but suffers from poor mechanical durability. This study presents a facile strategy to overcome this limitation by creating a covalently-bonded nanocomposite. A robust superhydrophobic coating via one-step spray deposition of a composite comprising PTFE and perfluorooctyltriethoxysilane (PFOTES)-functionalized silicon carbide nanoparticles (F-SiC) is prepared. The PFOTES modification (optimal at 4 wt%) serves as a critical interfacial engineer, which not only enhances the dispersion and compatibility of nano-SiC within the PTFE matrix but also constructs a uniform, hierarchical micro/nano-roughness essential for extreme water repellency. At an optimal F-SiC loading of 100 wt%, the coating exhibits exceptional superhydrophobicity, with a contact angle (CA) of 170.8 ± 1.1° and a sliding angle (SA) of 2.0 ± 1.1°. More importantly, the strong covalent interface translates into enhanced mechanical durability, as the coating maintains superhydrophobicity after severe tests including 10-cycle tape peeling, 8-m sandpaper abrasion, and 100-min water jet impact. The composite also demonstrates enhanced thermal stability (decomposition onset elevated by >140°C), retains superhydrophobicity after exposure up to 260°C, and shows excellent resistance to salt spray corrosion and prolonged acidic/alkaline immersion. The work establishes that rational interfacial design, achieved through targeted silane coupling, is a potent strategy for developing polymer-ceramic nanocomposite coatings that synergize ease of processing with comprehensive durability, paving the way for their practical application in demanding environments. Download: Download high-res image (154KB) Download: Download full-size image
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
Xiaoqiang Zhang,Quanlei Wang,Chuang Wang,Junli Ren,Xinze Du,Huixiang Li,Da-Ming Gao
Efficient hydrodeoxygenation (HDO) of biomass-derived phenolics relies on the effective coupling of hydrogen activation and C-O bond cleavage. Here, we report a Ni-NiO interfacial catalyst that enables interfacial synergy by integrating hydrogenation and deoxygenation functions within a confined nanoscale interface. By tailoring the reduction temperature of NiO/Al 2 O 3 , the Ni/NiO ratio is precisely controlled, with the catalyst reduced at 400 °C exhibiting highly dispersed Ni species intimately interfaced with NiO. Mechanistic studies suggest that hydrogen dissociated on metallic Ni can spill over to adjacent NiO, generating interfacial hydrogen species and enhanced acidity that facilitate C-O bond cleavage. Meanwhile, the close proximity of Ni and NiO enables efficient coupling of the hydrogenation and deoxygenation functions, thereby promoting rapid tandem conversion at the interface and lowering the apparent activation barrier for vanillin HDO.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 1
·118778
·
IF 6.3
Longgang Wan,Dongliang Jin,Zhengxian Di,Honggang Sun,Xiqiang Ma,Jie Lu,Shizhong Wei,Hongxia Li
Porous recrystallized silicon carbide (RSiC) is a promising structural ceramic for heat exchange and hydrogen metallurgy, but long-term steam exposure impairs its oxidation behavior and mechanical reliability. In this work, porous RSiC fabricated from α-SiC powders was oxidized in steam at 1100–1300 °C. The oxide-scale thickness followed a parabolic law with an apparent activation energy of 151 kJ/mol. Steam oxidation reduced porosity and skeleton thickness, while normalized neck size and crack density increased with time. Flexural strength showed non-monotonic evolution. A S - N - D model integrating skeleton support, neck strengthening and crack damage was developed, which can reproduce the strength evolution with high R ². Fitted parameters showed neck strengthening efficiency drops with temperature, while crack damage shifts from abrupt to gradual accumulation. Overall, RSiC strength evolution in steam is governed by competition between early neck strengthening and long-term skeleton degradation and crack damage.
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ACS Applied Nano Materials
·
2026
·
IF 5.5
Hanjie Huang,Qianqian Niu,Ying Huang,Huiyang Jiang,Xiaoxiao Zhao,Jiale Ma,Honghang Zhu,Meng Zong
Although traditional graphene-based absorbing materials exhibit excellent dielectric loss properties, they are prone to agglomeration and possess excessively high electrical conductivity, which can cause impedance mismatch and consequently degrade absorption performance. These limitations significantly constrain their application in electromagnetic wave absorption. Therefore, integrating graphene with other materials to reduce agglomeration, lower electrical conductivity, and enhance absorption performance is of great importance. This study proposes a low-solvent nanofluid composite strategy, where graphene oxide-coated silicon carbide (GO/SiC) serves as the core structure, with 3-Glycidoxypropyltrimethoxysilane (KH560) and Jeffamine M2070 (M2070) functioning as the corona and halo layers, respectively. Compared with graphene, GO induces additional surface defects, thereby enhancing dipole polarization; while SiC mitigates the excessive electrical conductivity of graphene, optimizes impedance matching, and creates heterogeneous interfaces to promote multiple internal reflections and interfacial effects. Moreover, the synergistic effect between KH560 and M2070 effectively suppresses GO agglomeration, enhances material fluidity, and facilitates interface heterogeneity. Compared with previously reported SiC-based composites (e.g., MWCNT/SiC with RLmin = −38.7 dB and EAB = 4.6 GHz), the GO/SiC-M2070 series composites in this study exhibit superior microwave absorption performance, with a minimum reflection loss (RLmin) as low as −47.0 dB and a maximum effective absorption bandwidth (EAB) of 7.94 GHz. This provides insights for the design of next-generation broadband and high-performance microwave absorbing materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Zhenyu Cheng,Rong Liu,Yijie Liu,Yi Yan,Jiaqi Tao,Junru Yao,Shuang Chen,Lvtong Duan,Wei Bo,Qing Ma,Weize Wang,Xu Li,Wenjian Zheng,Yuxian An,Zhengjun Yao,Yuting Shi,Tianjing Huang,Qiqi Teng,Jintang Zhou
Traditional electromagnetic wave absorbing materials have achieved significant progress in efficiently mitigating electromagnetic pollution and expanding absorption bandwidth through macroscopic composite and morphological design. However, the decisive role of microscopic heterojunctions in charge transport and polarization behavior remains unclear, hindering active manipulation of absorption bands via interface design. This study modulates the band structure of SiC/Cu via W/Ni doping to regulate the Schottky barrier at the interface. Ni doping lowers the work function, reducing the barrier and opening the electron gate to promote charge migration. In contrast, W doping raises the work function, increasing the barrier and confining interfacial charge. Combined experiments and DFT calculations show that a low barrier enhances conductive loss in the C-band. Sample CNi-2 achieves a 5.9 GHz absorption bandwidth at 5.9 mm, with full absorption from 3.6 to 5.9 GHz. A high barrier strengthens interfacial polarization, boosting Ku-band absorption. CW-3 reaches 6.5 GHz at 2.2 mm, covering 93% of the Ku band. Undoped SiC/Cu exhibits competing loss mechanisms, absorbing mainly in the X-band. This work offers a band-engineering strategy for designing tunable, high-performance absorbers, with promising applications in electromagnetic protection and stealth technology.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Haotong Wang,Ran Zhao,Zhongshuai Jia,Yusheng Yang,He Sun
Compared to conventional carbothermic reduction or aqueous electrolysis, molten oxide electrolysis (MOE) promises efficient metal extraction, improved environmental outcomes, and adaptability to diverse mineral feedstocks. A critical challenge is identifying refractory ceramics that enable a feasible, durable MOE process. In this work, the erosion behaviors of four refractories, BN, Si 3 N 4 , ZrO 2 , and SiC, are investigated in a molten CaO-SiO 2 -TiO 2 -Nb 2 O 5 -Fe 2 O 3 -CaF 2 slag from Bayan Obo tailings. Combining thermodynamic calculations with in situ observation via high-temperature confocal laser scanning microscopy, the erosion resistance of four ceramic materials was evaluated. It is found that ZrO 2 , BN, and Si 3 N 4 ceramics suffer severe degradation in the molten slags, whereas SiC maintains better stability. SiC was fabricated into crucibles to study the erosion process by the static crucible method. It is found that a dense protective layer dominated by TiC/NbC is formed on the surface of SiC, effectively inhibiting further penetration and erosion of molten slags. This explains why the actual corrosion resistance of silicon carbide in molten slag significantly outperforms theoretical predictions based on thermodynamic equilibrium calculations. The erosion rate of the SiC crucible is calculated to be 4.78 mg h −1 . These findings provide direct guidance for selecting refractories for MOE and advancing sustainable metallurgy.
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Small Methods
·
2026
·
IF 8.7
Jingyi Chen,Xiaotong Chen,Junzhe Xin,Wanxun Li,Chang Liu,Wenqing Wang,Ying Li,Rujie He
Biological systems have long inspired the design of functional materials, yet achieving functionally decoupled integration of multiple biomimetic functionalities within a single platform, especially across different media, remains a major challenge. Here, we report a jellyfish-coral bioinspired bilayer architecture that enables infrared (IR, 2.5–25 µm) stealth and electromagnetic (EM, 2–18 GHz) shielding above water as well as acoustic stealth (1–10 kHz) and drag reduction underwater. The upper layer, inspired by jellyfish microvilli, comprises a microvillar Si nanoarray that exhibits ultra-low infrared emissivity (< 20%) and air-film-mediated drag reduction, as evidenced by a water contact angle of 108.64°. The lower layer, inspired by coral skeletons, consists of a porous SiC framework decorated with in situ grown nanowire networks, which delivers broadband electromagnetic absorption (minimum reflection loss of −56.02 dB and an effective absorption bandwidth of 10 GHz at a thickness of only 3 mm) together with efficient acoustic wave dissipation (absorption coefficient ≈ 0.7 at an incident angle of 80°). These two bioinspired layers are monolithically integrated while preserving their respective functionalities, such that each stealth modality operates independently and without detrimental coupling. Consequently, the metastructure achieves robust, multispectral stealth performance in both sea-surface and underwater environments.
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