Journal of Energy Storage
·
2024
·
IF 8.9
Yanpeng Jia,Hongying Hou,Xianxi Liu,Xiaohua Yu,Ju Rong,An Lv,Yixuan Wang,Fangshu Chen
Garnet-type cubic Li 7 La 3 Zr 2 O 12 (LLZO) is widely considered as one of the most promising solid electrolyte candidates for the next-generation solid-state lithium batteries . However, high cost also limits the wide application of LLZO electrolyte. Allowing for the existence of trace hafnium (Hf) element in zirconium dioxide (ZrO 2 ) raw material and thus determining the threshold can significantly reduce the production cost of LLZO. Herein, the garnet-type xHf-LLZO solid electrolytes were synthesized at 1200 °C for 6 h using ZrO 2 raw material with different x mol% Hf (x = 0, 1.0, 1.8 and 2.7), in which 10 % sulfobetaine-modified polyvinylidene fluoride (SB-PVDF) was added for the composite electrolyte membranes in the solid state lithium cells. Furthermore, the effect of Hf element on the structure and electrochemical performances of LLZO solid electrolyte and the threshold of Hf in ZrO 2 were explored. The results showed that the tetragonal phase began to appear in LLZO when the molar ratio of Hf was 1.8 mol%, while the relative density and the room temperature ionic conductivity could remain 91.71 % and 1.08 × 10 −4 S/cm, respectively. The corresponding solid-state lithium cell delivered a specific discharge capacity of 130.2 mAh/g at 0.5C, and the capacity retention rate were as high as 90.7 % after 200 cycles at 1.0C. Seemingly, the threshold of Hf in ZrO 2 to prepare LLZO was about 1.8 mol%, thus reducing the cost for large-scale production of high-performance LLZO.
研究领域:
材料科学
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储能技术
·
固态离子学
·
电化学
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DOI
高影响因子
Minerals
·
2018
·Vol. 8
·期 4
·149
·
IF 1.835
Weiqing Wang,Jinyao Cong,Jie Deng,Xiaoqing Weng,Yiming Lin,Yang Huang,Tiefeng Peng
The effect of hydrofluoric acid (HF) pretreatment on flotation of feldspar and quartz using dodecylamine (DDA) as collector was investigated by micro-flotation, zeta potential, pyrene fluorescence spectroscopy, attenuated total reflection flourier transformed infrared spectroscopy (ATR-FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and bench scale flotation. The micro-flotation tests revealed that there was little difference in the flotation of feldspar and quartz at pH 2, using H2SO4as pH regulator. After HF pretreatment, the floatability of feldspar significantly increased while the floatability of quartz showed no change. HF pretreatment resulted in leaching of SiO2and enrichment of Na, K and Al on the feldspar surface. Consequently, the negative surface charge of feldspar increased at pH 2, which allowed for the flotation separation of the feasible minerals. This took place via an increased electrostatic adsorption between DDA and Na, K, Al on the feldspar surface, which effectively increased its hydrophobicity and as a result, improved the floatability of feldspar. An alternative process which exhibited effective separation of quartz and feldspar while recycling the tailwater from the flotation was proposed.Keywords:hydrofluoric acid;flotation;DDA;ATR-FTIR
研究领域:
矿物加工工程
·
材料科学与工程
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118901
·
IF 6.3
Zipeng Huang,Lili Gan,Lihua Qiao,Yanru Wu,Chenru Hao,Li Cheng,Ziqiang Chi
Microwave dielectric ceramics for next-generation communication systems require a high relative permittivity (
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DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Wenda Zhang,Xijian Duan,Lei Chen,Kai Wang,Yujie Song,Weigao Wang,Xiao Wei Sun
Red, green, and sky-blue InP quantum dots (QDs) are currently bridging the gap with CdSe-based QDs in terms of the photoluminescence quantum yields (PLQY). However, the sensitivity of InP QDs to water and oxygen, coupled with the increased specific surface area of smaller pure-blue and deep-blue QDs, leads to diminished PLQY, consequently restricting the fabrication of highly efficient blue InP quantum dot light-emitting diodes (QLEDs). Here, high-temperature nucleation is utilized to produce highly crystalline InP cores, followed by low-temperature HF etching. This dual-treatment method simultaneously addresses surface phosphate defects and diminishes QD size, ultimately yielding pure-blue InP QDs with a PLQY of 73% at 466 nm and deep-blue InP QDs with a PLQY of 52% at 451 nm. Notably, by fine-tuning the HF dosage, 421 nm deep-blue InP QDs, representing the shortest wavelength to date, were successfully prepared. Additionally, enhancing carrier injection efficiency was achieved by replacing long-chain 1-dodecanethiol (DDT) ligands with short-chain 1-octanethiol (OT) ligands through ligand exchange. QLEDs exhibited an external quantum efficiency of 0.8% with an emission wavelength of 468 nm, providing a perspective for the fabrication of InP blue QLEDs via this etching technique.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yumeng Ge,Sin-Yi Pang,Jinhua Hu,Pengjie Zhong,Zhen Xiao,Le Wang,Zewen Su,Gongxun Bai,Shiqing Xu,Jianhua Hao
Addressing the water shortage issue in a green and sustainable manner, solar water evaporation technology is regarded as a promising strategy for water desalination. However, conventional solar evaporators face structural limitations and exhibit lower evaporation rates, hindering their practical application. In this study, we propose a biomimetic three-dimensional (3D) solar evaporator that demonstrates exceptional performance in light absorption and thermal management. By utilizing two-dimensional (2D) HF-free MXene nanosheets as photothermal materials, the evaporator enhances light capture, and the surface-rich functional groups of these nanosheets facilitate efficient water transport. Experimental results have shown that, by leveraging the advantages of the 3D structure, the evaporation rate of water under single solar irradiation can reach 3.46 kg m -2 h −1 , surpassing many other experimental devices. In addition to its environmental friendliness, the evaporator’s edge salt crystallization provides excellent anti-salt deposition functionality. Furthermore, purification experiments on West Lake water were conducted, demonstrating its efficacy in water treatment. This innovative evaporator can be considered as a 3D sustainable seawater desalination strategy with potential application prospects.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 9
·1734
·
IF 3.7
Bing Bai,Yingqi Li,Wei Xu,Peiao Lu,Jiakun Luo,Jinyu Wu,Kui-Qing Peng
While metal-assisted chemical etching (MACE) or metal-catalyzed electroless etching of silicon in oxidizing HF solutions typically employs noble metals as catalysts, this work investigates oxide-catalyzed chemical etching (OACE) using RuO 2 to induce localized silicon etching in aqueous H 2 O 2 -HF solutions. RuO 2 particles confine the reaction to localized sites. The formation of Ru 2 O 3 during etching suggests that RuO 2 injects holes into silicon and is simultaneously reduced to Ru 2 O 3 . The oxidized silicon is locally dissolved in aqueous HF solution, and the pores are generated. A cyclic redox mechanism is proposed: RuO 2 is reduced to Ru 2 O 3 by extracting electrons from silicon valence band, while Ru 2 O 3 is rapidly reoxidized by H 2 O 2 , sustaining the etching process until H 2 O 2 is exhausted. This work challenges the conventional assumption that the catalyst remains unchanged during MACE and offers novel insights into oxide-catalyzed silicon etching mechanisms.
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DOI
PubMed
高影响因子
Foods
·
2023
·Vol. 12
·期 15
·2888
·
IF 5.2
Tong Sun,Yitao Wang,Mingyue Li,Dong Hu
Phthalic acid esters (PAEs) are the most commonly used plasticizers, and long-term or high levels of exposure to PAEs have a huge potential risk to human health. In this study, the theories of Hartree–Fock (HF) and density functional theory (DFT) with different hybrid methods and basis sets were used to calculate the theoretical Raman spectra of five PAEs, and the comparison of calculated spectra between different theories, hybrid methods, and basis sets was conducted to determine the suitable theory with hybrid method and basis set for PAEs. Also, the Raman vibrations were assigned to the Raman peaks of PAEs according to the theoretical and experimental Raman spectra. The results indicate that DFT is more suitable for the theoretical study of PAEs than HF. In DFT, the hybrid method of B3LYP is more applicable to the theoretical study of PAEs than B3PW91, and the basis set of 6-311G(d, p) obtains the most consistent theoretical Raman spectra with the experimental spectra for PAEs. This study finds the optimal combination of the theoretical method and basis set for PAEs, and it will contribute to the establishment of the Raman fingerprint and the development of rapid detection for PAEs in the future.Keywords:PAEs;Raman;DFT;HF;theoretical study
研究领域:
化学
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环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ying Quan,Qinfu Liu,Kuo Li,Hao Zhang,Liang Yuan
Due to the fine granularity of CG with the dissemination of non-graphite minerals, highly efficient purification of natural coaly graphite (CG) by low-cost, low-energy consumption and low-pollution methods remains a challenge. In this study, a novel and efficient electrochemical method is demonstrated for purifying natural CG. The electrochemical purification is carried out in a mixed electrolyte containing 0.5 M (NH 4 ) 2 SO 4 and 10% HF with an optimum potential sequence starting at + 2.5 V for a few minutes followed by a short burst of + 5 V. The CG purification mechanism is proposed based on the experimental results. There are three main factors, namely, the type of the graphite anode, the electrolyte and the applied voltage are critical for effectively electrochemical purification. It is interesting to find that the main purified products are graphene mixed with graphite aggregates at a yield of 68%. Raman analysis indicates that the purified CG has fewer structural defects than the natural CG after removing the non-graphite minerals. Moreover, the XPS and FTIR analysis demonstrate that no other functional groups are grafted onto the parent graphite during this purification process. In comparison with the electrolyte only containing HF, the adding of 0.5 M (NH 4 ) 2 SO 4 in the HF electrolyte could reduce the amount of HF by more than 50%, which cuts the cost and alleviates the impact on the environment.
研究领域:
材料科学
·
化学工程
·
环境科学
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产品关联
DOI
高影响因子
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2025
·
IF 3.4
Ai-qun Xiao,Pei-pei Zhao,Lu Yin,Bei Xu
A single-column extraction chromatographic purification method for tungsten using the N-benzoyl-N-phenylhydroxylamine (BPHA) resin was investigated in this study. This method greatly simplifies the W purification procedure, and only 10 ml of acid (5 ml 3 mol l -1 HCl-0.1 mol l -1 HF and 5 ml 1 mol l -1 HF) is required to separate W from Ti, Zr, Hf, Ta and other matrix elements. The blank in the separation step was less than 0.1 ng, and the recovery of W was ~ 99%. Six independent digestion measurements of reference materials BHVO-2, BCR-2, RGM-2 and JB-2 yielded μ 182 W values (mean value with intermediate precision, 95% confidence level) of -10.3 ± 4.0 ( n = 6, 2 s )，-1.2 ± 5.3 ( n = 6, 2 s )，-1.4 ± 4.4 ( n = 6, 2 s ) and 0.6 ± 3.8 ( n = 6, 2 s ), respectively, which are in good agreement with the previously reported values.
研究领域:
地球化学
·
分析化学
·
同位素地质学
·
质谱分析
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 4
·1033-1041
·
IF 4.912
Lei Hu,Xiaoli Dai,Ning Li,Xing Tang,Yetao Jiang
The catalytic transfer hydrogenation (CTH) pathway is a promising and appealing method for the selective hydrogenation of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-bis(hydroxymethyl)furan (BHMF) via the Meerwein–Ponndorf–Verley (MPV) reaction, in which the development of effective and economical catalysts is of great significance. Herein, this work designed and prepared a new hafnium-based metal–organic coordination polymer (Hf-DTMP) by the simple assembly of hafnium tetrachloride (HfCl4) and diethylene triaminepenta(methylene phosphonic acid) (DTMP). Comprehensive studies demonstrated that Hf-DTMP is an amorphous and mesoporous catalyst with a strong acid–base bifunctionality, and so, it displayed excellent catalytic activity for the CTH of HMF into BHMF with a high yield of 96.8% in 2-butanol (sBuOH) at a moderate reaction temperature of 130 °C for 4 h. In addition, Hf-DTMP exhibited good heterogeneity, reusability and stability, and it could be easily recovered from the reaction mixture by filtration and consecutively used for at least 5 recycles without a dramatic loss in catalytic activity. More gratifyingly, Hf-DTMP also showed superior universality for the CTH of 5-methylfurfural (MF), furfural (FF), levulinic acid (LA), ethyl levulinate (EL) and cyclohexanone (CHN) into the corresponding products with high yields, obviously indicating that it has tremendous potential for the selective hydrogenation of various biomass-derived carbonyl compounds.
研究领域:
化学工程
·
催化材料科学
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Shuaijun Yang,Mei Wang,Yetong Lv,Huilin Sheng,Yexia Qin
Oxidation resistance is crucial to the potential applications of high-entropy carbides (HECs) at elevated temperatures. Here, we realize the exploration of (Hf, Ta, Zr, Cr)C high-entropy carbides (HEC-TM, TM = Hf, Zr, Ta, and Cr) with good oxidation resistance by optimizing their compositions. To be specific, 21 kinds of HEC- x TM ( x = 0–25 mol%) samples are fabricated by a high-throughput ultrafast high-temperature sintering technique, followed by oxidation testing at 1673 K for 30 min. Among all the HEC samples, the as-fabricated HEC-0Zr samples are proved to possess the best oxidation resistance with an oxidation depth of only 53 µm. Further study on isothermal oxidation kinetics demonstrates that the as-fabricated HEC-0Zr samples follow a linear oxidation law. The good oxidation resistance of the as-fabricated HEC-0Zr samples is believed to result from the (Ta, Me) 2 O 5 phase with a low melting point, which can promote the densification of the oxide layer. This research opens up a new way for efficiently discovering new HECs for extreme applications.
研究领域:
材料科学
·
高温材料
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DOI
高影响因子
Optics
·
2025
·Vol. 7
·期 1
·1
·
IF 1.6
Chenxing Liao,Huihuang Cai,Jiabao Wu,Wei Xie,Liaolin Zhang
Mn4+-activated fluoride phosphors possess outstanding luminescent properties, making them highly suitable for applications in lighting and display technologies. However, the synthesis of such phosphors generally requires the use of large amounts of highly toxic aqueous HF, leading to serious environmental pollution. To eliminate the use of hazardous HF solution, a low-temperature molten salt method employing NH4HF2was developed to synthesize the narrow-band red emitter Cs2GeF6: Mn4+phosphor. Following the reaction, the product was washed with a dilute H2O2solution to remove residual NH4HF2and other impurities. The phase purity and morphology were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively, and the luminescence properties were examined via photoluminescence (PL) spectroscopy. The obtained phosphors exhibit bright red emission characteristics of Mn4+under blue-violet excitation. Among them, Cs2GeF6: 0.08 Mn4+shows the highest emission intensity, with an internal quantum efficiency (IQE) of 78%. A white light-emitting diode (WLED) fabricated by combining this phosphor with a blue chip and commercial Y3Al5O12: Ce3+(YAG) phosphor achieved a high luminous efficacy (LE) of ~146 lm/W, a correlated color temperature (CCT) of ~4396 K, and a color rendering index (Ra) of ~83, alongside excellent operational color stability.
研究领域:
材料科学
·
光电子学
·
固态化学
·
发光材料
·
LED技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）