COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Mingtai Hou,Zeyi Jiang,Fuqiang Chu,Xinru Zhang,Nien-Chu Lai
Organic phase change materials (PCMs) promise remarkable latent heat storage capacity but suffer from weak visible-light absorption capability and ultralow thermal conductivity for harvesting and conversion of clean solar energy. Herein, we design and synthesize a new core@shell structured n-eicosane@TiO 2 /TiN composite microcapsules which can realize 98.08 % of thermal energy storage capacity. By making use of the localized surface plasmon resonance of high-thermal-conductivity TiN , the prepared composite microcapsules possess a remarkable photo-thermal conversion efficiency up to 78.4 %. Plasmonics TiN can not only efficiently adsorb visible light and convert the optical energy into heat but also enhance thermal conductivity of the composite microcapsules, resulting in ultra-low supercooling degree of 1.02 o C. In addition, the composite microcapsules exhibit excellent phase change reversibility and thermal durability during the 100-cyclic scans. Our work offers new insights into designing high-performance microcapsuled PCMs in solar thermal applications, bringing great potential for renewable energy utilization beyond traditional fossil energy sources.
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高影响因子
COMPOSITES COMMUNICATIONS
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2022
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IF 7.685
Meng Liu,Zhaozhu Zhang,Yanling Wang,Peilong Li,Mingming Yang,Junya Yuan
Herein, TiN@ZIF-8 hybrid with hierarchical structure was constructed by in situ growth of Zeolitic Imidazolate Frameworks-8 (ZIF-8) onto the TiN surface via a PDA/PEI (polydopamine/polyethyleneimine) intermediate layer. The characterization of structure and chemical composition affirmed the successful assembly of TiN@ZIF-8 hybrid and the specific surface area of TiN@ZIF-8 hybrid showed a sharp increase from 3.5 m 2 /g for pristine TiN to 183.4 m 2 /g. The resulted TiN@ZIF-8 hybrid was aimed at strengthening the mechanical and tribological properties of fabric composites . The results demonstrated that the tensile strength of TiN@ZIF-8/fabric composites presented an increase by 48% due to the stress transfer and reinforcement of TiN@ZIF-8. Additionally, the incorporation of TiN@ZIF-8 restricted the moving of resin molecular chain and escape of decomposition products, contributing to the improvement in heat resistance of fabric composites. Friction and wear tests indicated that the abrasion resistance of TiN@ZIF-8/fabric composites was significantly improved in comparison with pristine composites because the ZIF-8 loaded on the surface of TiN made for a more even dispersion of TiN, and the introduction of TiN@ZIF-8 contributed to forming a uniform, dense transfer film due to the synergistic enhancement between TiN and ZIF-8.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 6
·8313-8327
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IF 4.672
Nianben Zheng,Fang Yan,Long Wang,Zhiqiang Sun
Summary Solar energy is being widely investigated due to its abundant, renewable, and clean features. Photo-thermal conversion in solar collectors is a direct approach for harvesting solar energy. Compared to the commonly used surface-based solar collectors (SSCs), nanofluid-based direct absorption solar collectors (DASCs) are more efficient. In this work, water-based mono MWCNT and hybrid MWCNT-TiN nanofluids were prepared through a two-step method, aiming at light absorption enhancement of nanofluids for applications in DASCs. The optical and photo-thermal conversion performance of the MWCNT nanofluids was firstly evaluated. The results showed that the MWCNT nanofluids presented high solar absorption capability, and the highest photo-thermal conversion efficiency was obtained at 10 ppm. The TiN nanoparticles were subsequently incorporated to form the hybrid MWCNT-TiN nanofluids. The absorption performance of the hybrid nanofluids was further enhanced. The highest efficiency of the hybrid MWCNT-TiN nanofluids was achieved at the TiN mass fraction of 10 ppm, which was about 6.9%, 6.0%, and 3.8% higher than that of the MWCNT nanofluid at 2000, 4000, and 6000 seconds due to the localized surface plasmon resonance (LSPR) effect of TiN nanoparticles. It was also found that the collector efficiency dropped rapidly with the prolonged irradiation time owing to the convection and radiation heat loss at the elevated temperature. Therefore, effective measures should also be taken to reduce heat loss to maintain high photo-thermal conversion efficiency.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 21
·52210
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IF 3.057
Huili Shi,Zhiwei Li,Xiaohong Li,Zhijun Zhang
Doping is a simple and effective method to change material properties. In this work, in order to improve the flame retardant performance of bismuth oxychloride (BiOCl) nanosheets in poly (vinyl chloride) (PVC), for the first time, iron and tin ions were doped into BiOCl (Fe-BiOCl and Sn-BiOCl) via a doping approach, respectively. X-ray diffraction and morphology characterization confirmed that the Fe and Sn ions were doped into the BiOCl lattices, respectively. After doping, PVC composites obtained superior flame retardancy and smoke suppression. With the adding amount of 3 wt% Fe-BiOCl and Sn-BiOCl, the UL-94 test rating of the PVC composites reached V-0, and the peak of heat release rate reduced by 38% and 34%, total smoke production decreased by 55% and 42%, respectively, compared to neat PVC. Thermogravimetric and Thermogravimetric-Fourier Transform Infrared results showed that Fe or Sn doping could further reduce organic volatiles in the gas-phase and improve char residual in the condensed phase, both of which contribute to reducing fire hazards. Tensile properties and tensile modulus of PVC composites increased. In short, it is an economically effective approach targeting to improve the comprehensive properties of PVC through doping Fe or Sn into BiOCl.
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高影响因子
JOURNAL OF APPLIED PHYSICS
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2023
·Vol. 134
·期 8
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IF 3.2
Li Gaojie,Zhang Linqi,Du Kai,Wang Xinxin,Yin Menghao
Reducing the working temperature and increasing sensitivity and selectivity has always been a research hotspot in the field of MOS based gas sensors. In this work, improved triethylamine (TEA) sensing performance and mechanism of SnO 2 by doping Pd have been investigated. SnO 2 nanoparticles and Pd-SnO 2 with different doping amounts of Pd (0%, 0.1%, 0.3%, 0.5%, and 0.7%) were successfully prepared by the hydrothermal method. The size of SnO 2 nanoparticles is very uniform (∼15 nm). The SnO 2 sensor exhibited the highest sensitivity to ethanol at 290 °C. After Pd doping, Pd/SnO 2 sensors not only reduced the optimum working temperature but transformed selectivity from ethanol to TEA. In the Pd-SnO 2 system, the 0.5Pd-SnO 2 sensor exhibited high sensitivity (61), fast response-recovery properties (16 s/6 s) to 50 ppm TEA, lower detection limits (0.1 ppm), good repeatability, and higher selectivity. Furthermore, based on density functional theory calculations, the improved TEA sensing performance of 0.5Pd-SnO 2 sensors can be attributed to the improved surface activity of SnO 2 by Pd doping and the catalytic activation of O 2 and TEA by Pd.
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高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
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2023
·Vol. 54
·期 11
·4332-4341
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IF 2.8
Li Hang,Dong Longhao,Duan Hongjuan,Huang Zhong,Li Yage,Liu Xuefeng,Huang Ren,Jia Quanli,Ye Hang,Zhang Haijun,Zhang Shaowei
Non-oxide ceramic aerogel draws increasing attention in area of thermal insulation because of its low density, high temperature resistance and good chemical/thermal stability. Here, a BCN-TiN composite aerogel was prepared by an in-situ carbothermal reduction/nitridation method, using melamine (C 3 N 6 H 6 ), boric acid (H 3 BO 3 ), chitosan ((C 6 H 11 NO 4 ) n ) and titanium dioxide (TiO 2 ) as raw materials. The aerogel prepared at 1473 K showed a porosity high up to 97.6 pct with a density of 0.05 g/cm 3 . When testing at a temperature of 673 K, the thermal conductivity value of as-obtained composite aerogel was as low as 0.135 W/(m K). Moreover, the lightweight BCN-TiN aerogel had the high-temperature stability (at least 1473 K) and good compression strength, which ensures it a potential high-temperature insulation material in inert atmosphere. Graphical Abstract
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高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Antony Rajendran,Hong-Xia Fan,Tian-You Cui,Jie Feng,Wen-Ying Li
SO x emission, one of the significant contributors to air pollution, is primarily caused by the combustion of sulfur-containing liquid fuels . Thus, ultra-low sulfur or sulfur-free fuels production gains more attention to construct the SO x -free environment. Despite the oxidative desulfurization using polyoxometalates and hydrogen peroxide showing promising results, the requirement of hydrogen peroxide in excess and the complicated synthesis of heterogeneous polyoxometalates are the key drawbacks. So, in this paper, facile hydrothermal synthesis of mesoporous tin oxide-supported octamolybdates containing Mo V and Mo VI sites is reported for oxidative desulfurization with near stoichiometric hydrogen peroxide. The current catalytic system seems competitive among molybdenum-based oxidative desulfurization catalysts due to its higher turnover frequencies of 28.1 h −1 . The straightforward synthesis of catalysts and their excellent oxidative desulfurization activity would be attractive in building the SO x -free environment via clean transport energy.
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高影响因子
ADVANCED MATERIALS
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2023
·Vol. 35
·期 48
·2307042
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IF 29.4
Mingbian Li,Yuhong He,Xiaopeng Feng,Wei Qu,Wei Wei,Bai Yang,Haotong Wei
Tin perovskites have emerged as a promising alternative material to address the toxicity of lead perovskites and the low bandgap of around 1.1 eV is also compatible with tandem solar cell applications. Nevertheless, the optoelectronic performance of solution-processed tin perovskite single-crystal counterparts still lags behind because of the tin instability under ambient conditions during crystal growth and limited reductants to protect the Sn 2+ ions from oxidation. Here, the reductant engineering to grow high-quality tin perovskite single crystals under ambient conditions is studied. Oxalic acid (H 2 C 2 O 4 ) serves as an excellent reductant and sacrificial agent to protect Sn 2+ ions in methanol due to its suitable redox potential of −0.49 V, and the CO 2 as the oxidation product in the gas state can be easily separated from the solution. The FPEA 2 SnI 4 single crystal grown by this strategy exhibits low trap density perovskite surface by constructing an FPEA 2 PbI 4 -FPEA 2 SnI 4 (FPI-FSI) single crystal heterojunction for X-ray detection. An improved X-ray sensitivity of 1.7 × 10 5 µC Gy −1 cm −2 is realized in the heterojunction device, outperforming the control FPEA 2 PbI 4 counterpart.
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PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2021
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IF 5.541
Yang Li,Bin Hu,Salman Raza Naqvi,Zhen-xi Zhang,Kai Li,Qiang Lu
5-Hydroxymethylfurfural (5-HMF) is a value-added platform chemical, which can be obtained from pyrolysis of biomass materials, whereas related investigation on its selective production via catalytic fast pyrolysis (CFP) process is still insufficient. In this work, a zirconium-tin mixed metal oxide (ZrO 2 -SnO 2 ) catalyst was developed for the selective production of 5-HMF from the in-situ CFP of cellulose. According to pyrolysis-chromatography/mass spectrometry (Py-GC/MS) tests, the ZrO 2 -SnO 2 catalyst has better performance on the selective preparation of 5-HMF than single nano oxide ZrO 2 , SnO 2 , or their physical mixture. 5-HMF was sensitive to the reaction conditions, and its yield and selectivity always exhibited the tide of first increasing followed by decreasing along with the increase of Zr loading and catalyst-to-cellulose (CA-to-CL) ratio. At the optimum conditions with ZrO 2 -SnO 2 of 15 wt% Zr loading (ZrO 2 -SnO 2 -15), pyrolysis temperature of 350 °C and CA-to-CL ratio of 2:1, the 5-HMF yield was 6.49 wt%, which was 4 times more than that of the non-catalytic process (1.35 wt%). Correspondingly, the selectivity of 5-HMF was up to 23.50 %. The catalyst characterization combined with the pyrolysis texts of several typical saccharides, including cellobiose, maltose, glucose, and mannose indicated that the ZrO 2 -SnO 2 -15 could promote the breakage of glycosidic bonds with the formation of reducing ends and the selective conversion of the reducing end to 5-HMF due to its mild acidity. Overall, the ZrO 2 -SnO 2 is expected a promising catalyst for the CFP of cellulose to prepare 5-HMF.
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高影响因子
Molecular Catalysis
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2021
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IF 5.062
Jian He,Zhaozhuo Yu,Hongguo Wu,Hu Li,Song Yang
Effective synthesis of aromatic compounds from renewable biomass is highly important yet challenging. p -Cymene is an attractive aromatic compound with various promising applications in the manufacture of fine chemicals. In this study, a novel and effective catalytic system based on mesoporous tin phosphate (M-SnPO) with Lewis-Brønsted dual acidity was developed for the fast synthesis of p -cymene from the cyclodehydration of bio-based citral. Up to 78.5% yield of p -cymene was achieved from the cyclodehydration of citral at 180 °C within only 0.5 h, superior to the results reported for benchmark homogeneous acid catalysts. Characterization of as-prepared M-SnPO catalyst via various techniques indicates that the synergic effect of Lewis and Brønsted acidic sites, large pore-sized structure, and high surface area are responsible for its remarkable catalytic performance. In addition, the effectiveness of the M-SnPO catalyst could be almost sustained over multiple cycles without significant loss. The work herein is the first example of developing a Lewis-Brønsted dual acidic heterogeneous catalyst for the fast synthesis of p -cymene from the cyclodehydration of citral.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Bin Bin Jin,Hui Sheng Huang,Shu Ying Kong,Guo Qing Zhang,Biao Yang,Chu Xing Jiang,Ya Zhou,Dan Jun Wang,Jing Hui Zeng
Antimony tin oxide (ATO)/lead selenide (PbSe) composite was rationally designed and fabricated on fluorine doped tin oxide glass (FTO) for using as counter electrode (CE) of quantum dot sensitized solar cells (QDSSCs). The electrocatalytic activity of the CE is deeply investigated in the polysulfide electrolyte by employing the Tafel, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) of the symmetrical cells. The results confirm that the ATO/PbSe CE has better electrocatalytic activity and stability than that of PbSe CE obtained by pulse voltage electrodeposition (PVD). The enhanced electrocatalytic performance of ATO/PbSe CE can be attributed to its high specific surface area, excellent permeability, conductivity and interface connectivity, which provide more electrocatalytic active sites for the reduction of polysulfide species, as well as fast channels for ions diffusion and electron transport . As a result, the CdS QDSSCs and CdS/CdSe co-sensitized QDSSCs assembled by the ATO/PbSe CE exhibits better power conversion efficiency ( η ) of 1.72% and 5.59%, respectively than that of PbSe CE obtained by PVD. Furthermore, photovoltaic property of the ATO/PbSe CE in CdS/CdSe co-sensitized QDSSCs keeps stable for over 200 min. This present work provides a simple and effective strategy for the construction of high-performance CE materials of QDSSCs.
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PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
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IF 3.085
Zhou Liu,Shuzhen Wu,Xiaojie Yang,Yijun Zhou,Jiaren Jin,Junmei Sun,Li Zhao,Shimin Wang
SnO 2 has attracted extensive attention in planar perovskite solar cells (PSCs) owing to its outstanding photoelectric properties and low temperature preparation. However, pinholes are easy to appear in the annealing process of SnO 2 films, which limits its application in planar PSCs. Here lists a simple and low-cost method: Urea-complexed tin oxide in deionized water can effectively control the concentration of SnO 2 . This process is conducive to forming a compact surface morphology . Meanwhile, the work explored the effect of the properties of PSCs with different thicknesses of SnO 2 layers. The system analysis showed that PSCs based on 60 nm SnO 2 layer and the methamphetamine lead iodide (MAPbI 3 ) light absorber yielded the highest power conversion efficiency (PCE) over 18%, a fill factor ( FF ) of 0.793, and good stability. Therefore, we believe our study provides an effective way for preparing electron transport layers.
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高影响因子
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