Sustainable Energy & Fuels
·
2018
·Vol. 2
·期 7
·1481-1490
·
IF 0
Rong Zhou,Jianxing Huang,Shaobo Lai,Jiyang Li,Feng Wang,Zhiqiang Chen,Weiqing Lin,Chao Li,Jing Wang,Jinbao Zhao
A novel strategy for selecting an additive based on understanding the influence of different functional groups on electrochemical characteristics is adopted. N,N-Diethylamino trimethylsilane (DEATMS) is tested as a bifunctional electrolyte additive to scavenge H2O and neutralize HF in the electrolyte and enhance the behaviour of graphite/LiNi0.5Co0.2Mn0.3O2 cells operating at a high voltage (4.5 V vs. Li/Li+) or elevated temperature (55 °C). With 2% DEATMS, no LiPF6 hydrolysis species is found after storage at 55 °C for 6 days, even with a moisture content of 2000 ppm in the electrolyte. In addition, the graphite/LiNi0.5Co0.2Mn0.3O2 cells containing DEATMS show cycling performances superior to those of the cells without DEATMS upon cycling for 100 cycles at a high voltage (85.5% vs. 72.0%) or high temperature (81.2% vs. 70.6%). The sacrificial oxidation of DEATMS on the cathode surface restricts direct contact between the electrolyte and cathode, improving the electrochemical performance. The ex situ surface analysis of the electrodes after cycling indicates that both the electrolyte decomposition and Mn dissolution are inhibited by the deposition of DEATMS oxidation products.
研究领域:
材料科学
·
电化学
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HYDROMETALLURGY
·
2026
·
IF 6.3
Gengjin Zhang,Yanfang Huang,Longfei Jia,Tianze Chen,Yizhuang Wang,Shengpeng Su,Wenjuan Wang,Hu Sun,Guihong Han
Novel peroxo-complexation strategy was used to purify Nb-rich solution. • NbOF 5 2− transformation to NbO 2 F 5 2− greatly lowers its binding energy with MIBK. • Selectivity coefficient for Sb over Nb was enlarged by over 2300 times. • Nb 2 O 5 product met the high-purity specifications regarding Ta and Sb impurities. The efficient separation of Ta and Sb from Nb in hydrometallurgical processes remains a significant challenge due to their similar chemical behaviors. In this study, a novel peroxo-complexation strategy was introduced to enhance the selectivity of methyl isobutyl ketone (MIBK) extraction in an HF-H 2 SO 4 system. With the addition of H 2 O 2 , the extraction efficiencies of Ta and Sb reached 99.6% and 99.7%, respectively, while the co-extraction of Nb was only 2.32%. The selectivity coefficients of Sb/Nb and Ta/Nb significantly increased from 0.63 and 34.7 to 1461 and 6501, respectively. Stepwise stripping using H 2 SO 4 and pure water effectively recovered Nb and Ta/Sb from the loaded organic phase. Raman spectroscopy and quantum chemical calculations elucidated the mechanism of the enhanced separation selectivity. The peroxo-ligand selectively coordinates with Nb to transform it from NbOF 5 2− to NbO 2 F 5 2− , thereby weakening the negative surface potential of the fluorine atoms bonded to Nb. The binding energy between Nb ions and MIBK decreases from −172 kJ mol −1 to −104 kJ mol −1 , and thus the disparity in the affinity of Nb ions and Ta/Sb ions for MIBK is magnified. Overall, this peroxo-coordination approach provides an efficient and simple pathway for the effective purification of Nb solutions. Download: Download high-res image (176KB) Download: Download full-size image
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高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
TianXiang Li,RuoKun Jia,PengPeng Wang,DuMin Li,JiaHui Chen,Xubo Song
Through a simple hydrothermal strategy, a strongly coupled g‑C 3 N 4 /Hf‑MOF heterojunction (CN/HUN) was successfully prepared, achieving efficient and selective photocatalytic CO 2 reduction to methanol without sacrificial agents. After reacting for 3 hours under simulated sunlight conditions without a sacrificial agent, the optimized CN/HUN 7 catalyst achieved a cumulative methanol yield of 520.48 μmol g -1 and a selectivity of 83%. Systematic characterization indicates that the strong interfacial interactions and electronic coupling between g-C 3 N 4 and Hf-MOF effectively accelerate charge separation, suppress carrier recombination, and significantly reduce charge transfer resistance. Furthermore, the Hf-MOF forms a Z-type heterojunction structure with g-C 3 N 4 , thereby enabling directed electron transfer. While electrons in the conduction band (CB) of the Hf-MOF are transferred to the valence band (VB) of g-C 3 N 4 , the unsaturated Hf 4+ sites may promote CO 2 adsorption and activation through Lewis acid-base interactions and are expected to stabilize key intermediates during the CO 2 reduction process, thereby enhancing the performance of CO 2 reduction to methanol. We demonstrate a viable route to construct tightly integrated MOF heterojunctions for high-performance photocatalytic CO 2 reduction to fuels. Download: Download high-res image (236KB) Download: Download full-size image
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 6
·e70904
·
IF 4.2
Xinzi Zhong,Quanneng Zhang,Ji Zou,Keyu Gong,Zhipeng Zhang,Jingjing Liu,Huayue Liang,Shuaihang Qiu,Weimin Wang,Zhengyi Fu
Multicomponent oxide ceramics yield great promises in next-generation thermal protection systems according to their high potential for thermal stability and ablation resistance, but their protective mechanisms remain unclear. In this study, the five multicomponent A 6 B 2 O 17 (A = Zr, Hf; B = Nb, Ta) oxide ceramics with different atomic concentrations, respectively, at A- and B-sites, were prepared via a solid-state reaction with a rapid cooling process. Their phase, structural evolutions, and the properties under high-temperature treatment and dynamic ablations were investigated to reveal thermal stability and anti-ablation mechanisms. Only the (Hf 1/2 Zr 1/2 ) 6 (Ta 1/2 Nb 1/2 ) 2 O 17 with equal molar ratio both at A- and B-sites maintained the A 6 B 2 O 17 phase after heat treatment at 1773 K for 25 h; the other samples underwent phase separation behaviors. In addition, the (Hf 3/4 Zr 1/4 ) 6 (Ta 2/3 Nb 1/3 ) 2 O 17 ceramic showed excellent ablation resistance (∼2500 K, 100 s) with the thinnest oxide layer. This property is attributed to the formation of “skeleton-filler phase” protective composite layer, as the (Zr, Hf)O 2 “skeleton” owns high melting point and low volatility to resist thermal gas erosion, and the A n B 2 O 2n+5 family fills defects and hinders the penetrations of O 2 . This study expects to offer design for advanced thermal barriers suitable for the next-generation hypersonic vehicles and reusable spacecraft.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siqi Lan,Zhenguo Huang,Wenyan Huang,Yeqi Zhu,Jiahua Zhan,Shengjian Mao,Zhichao Xue,Rongqian Yao
Demand for SiC-based polymer-derived ceramics (PDCs) employed as hypersonic vehicle components with light weight, high strength, excellent high-temperature/ablation resistance is increasingly urgent. Herein, bulk SiC(Hf, rGO) nanocomposite PDCs were fabricated via re-pyrolyzing ball-milling blends of unique SiC(Hf, rGO) p /polyhafniumcarbosilane-vinyltriethoxysilane-graphene oxide (PHVG). Highly cross-linked PHVG can effectively optimize compact formability and improve ceramic yield. In-situ formed HfO 2 embedded in ceramic network toughens microstructure, while interfacial HfOSi increases structure disorder to improve high-temperature properties. As demonstrated, SiC(Hf, rGO) modified by 3 wt.% Hf and re-pyrolyzed at 1300 °C possess good mechanical performances including hardness (5.83 GPa), fracture toughness (4.29 MPa·m 1/2 ), compressive strength (181.83 MPa) and flexural strength (46.55 MPa). More interestingly, self-healing HfO 2 (HfSiO 4 )/SiO 2 protective layer emerging during 20 min surface ablation test at 1300 °C, timely covers defects and avoids destructive structure, thus retains stable structure and mechanical properties of specimens. Such nanocomposites can promote uses in thermal protection systems (TPS) for hypersonic vehicles against extreme high-temperature environments.
研究领域:
材料科学
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航空航天工程
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chao Li,Ying Li,Yi Xu,Jiyou Zhong
Near-infrared (NIR) phosphors as crucial components of NIR light sources have multifunctional and smart spectroscopy applications, prompting an increasing research interest in developing efficient and stable NIR materials. Focusing on this issue, the present study explored the luminescent properties of Cr 3+ -doped Ca 3 ZnMGe 3 O 12 (M = Zr, Hf, Sn and Ti) garnet family. These materials exhibit an emission peak falls within the range of 785–805 nm with a full width at half maximum (FWHM) varying from 114 to 123 nm. Among them, the Ca 3 ZnZrGe 3 O 12 :Cr 3+ phosphor shows the highest photoluminescence quantum yield (PLQY = 60.3 %) and an excellent thermal stability ( I 423K / I 298K = 77.51 %). Moreover, the performance of a prototype Ca 3 ZnZrGe 3 O 12 :Cr 3+ -containing NIR pc-LED device was estimated, which achieves an NIR output of 23.46 mW and a photonic efficiency of 14.09 % under 100 mA driving current. Non-destructive examination can be realized using this light source, demonstrating the good potential of the material in NIR spectroscopy applications.
研究领域:
材料科学
·
光电技术
·
光子学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Bing Liu,Hong Yang,Jinbin Xu,Minxue Deng,Yongbo Xiong,Sihui Wu,Zhanwang Li,Yuncong Xu,Mingyue Wang,Wenfeng Han
Stabilizing metastable active centers under harsh reaction conditions represents a significant challenge in heterogeneous catalysis. The F-Al-O species exhibits excellent catalytic activity for the gas-phase dehydrofluorination of potent greenhouse gas hydrofluorocarbons (HFCs) to produce hydrofluoroolefins (HFOs). However, this species is prone to transform into the F-Al-F configuration via excessive fluorination, subsequently leading to catalyst deactivation because of coke deposition. To address this issue, we present a viable strategy for stabilizing the metastable active centers. Al 2 O 3 doped with boron (B), phosphorus (P), and sulfur (S) was synthesized via the sol-gel method. Results demonstrate that in the dehydrofluorination of HFC-245fa, the phosphorus-doped Al 2 O 3 catalyst (P-Al 2 O 3 ) outperforms its boron- and sulfur-doped counterparts, achieving a conversion of 87% compared to 68% and 49%, respectively. The incorporation of P significantly alters the coordination environment of Al 3 + within the Al 2 O 3 lattice, forming O-Al-O-P bonding configurations. During the subsequent dehydrofluorination reaction, these structures undergo fluorination to yield HF-resistant F-Al-O-P species. This process effectively impedes the deep fluorination of Al 2 O 3 into AlF 3 , thereby stabilizing the metastable F-Al-O active centers. Furthermore, this anti-fluorination mechanism significantly suppresses catalyst coking and prevents pore structure collapse. In the dehydrofluorination of HFC-245fa to HFO-1234ze, the P-Al 2 O 3 catalyst achieved a high conversion of 87%, representing an approximately threefold enhancement over conventional Al 2 O 3 , and no significant deactivation trend was observed after 500 h of reaction. This work provides a fundamental understanding of stabilizing metastable active centers and paves a practical pathway for designing robust catalysts for reactions under corrosive atmospheres.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qijun Tang,Peiyao Xiong,Haiqiang Wang,Zhongbiao Wu
Photocatalytic CO 2 reduction to produce value-added products is considered a promising solution to solve the global energy crisis and the greenhouse effect. In this study, Ti 3 CN MXene was synthesized using a Lewis acidic etching method without the usage of toxic hydrofluoric acid (HF). Ti 3 CN MXene was then used as a support for the in situ hydrothermal growth of TiO 2 and Ru nanoparticles. In the presence of 0.5 wt% Ru, Ru-Ti 3 CN-TiO 2 shows CO and CH 4 production rates of 99.58 and 8.97 μmol/g, respectively, in 5 h under Xenon lamp irradiation, more than 20.5 and 9.3 times that of commercial P25. The enhancement in photocatalytic activity was attributed to the synergy between the in-situ growth of TiO 2 on Ti 3 CN MXene and Ru nanoparticles. It was proven experimentally that Ti 3 CN MXene can provide abundant pathways for electron transfer. The separation and transfer of the photo-induced charge were further increased with the help of Ru and Ti 3 CN MXene, leaving more electrons to participate in the subsequent CO 2 reduction reaction. We believe that this work will encourage more attention to designing environment-friendly MXene-based photocatalysts for CO 2 photoreduction using the non-HF method.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 12
·6901-6912
·
IF 3.502
Qiyun Wu,Chenxing Liao,Jinquan Pan,Xinyu Ye,Weixiong You,Libin Xia
It has been one of the hot issues to prepare the red-emitting Mn 4+ -doped fluoride phosphors with highly efficient and waterproofness for warm white-light-emitting diodes (WLEDs) by the green and environmentally friendly method. Herein, we design a novel green molten salt route to synthesize K 2 SiF 6 :Mn 4+ red powder using molten NH 4 HF 2 salt instead of HF liquor as the reaction medium. The results show that KMnO 4 and MnF 2 could produce Mn 4+ in NH 4 HF 2 molten salt through a reduction reaction, and the resulting Mn 4+ -doped K 2 SiF 6 exhibited a bright red emission peaked at 632 nm under blue light excitation. The luminescence intensity of the as-obtained product after immersing into water for 24 hours maintain nearly 100% of that before soaking and emission peak shape remains unchanged. The thermal stability of the sample was evaluated by temperature-dependent luminescence spectral intensity during heating and cooling. Furthermore, a warm white-light-emitting diodes (WLEDs) with an excellent color rendering index (Ra = 87.1), lower correlated color temperature (CCT = 3536K), and high luminous efficacy (116.99 lm·W −1 ) was fabricated based on blue chip and K 2 SiF 6 :Mn 4+ and commercial yellow phosphor (Y 3 Al 5 O 12 :Ce 3+ ).
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Liqin Xiong,Zheng Cheng,Guorong Hu,Yanbing Cao,Zhongdong Peng,Bin Zhang,Ke Du
High-voltage spinel LiNi 0.5 Mn 1.5 O 4 (LNMO) emerges as an ideal cathode for high energy density lithium-ion batteries due to its 4.7 V operating voltage and low-cost manganese-rich composition. However, the severe interfacial degradation caused by transition metal dissolution and pervasive electrolyte decomposition compromises practical viability in commercial lithium-ion batteries, critically under elevated-temperature operation. To address this problem, we constructed a covalently anchored bis[3-(trimethoxysilyl)propyl]amine (BTPA) coating layer on the LNMO surface through atomic-scale grafting. The BTPA-coated LNMO confers exceptional cyclic stability and rate capability, representing a transformative advancement in cathode performance. At 50 °C, BTPA-coated LNMO cathode maintains 96.10 % capacity retention after 100 cycles at 1C, significantly outperforming pristine LNMO (58.92 % retention), while demonstrating exceptional rate capability with 109.42 mAh·g −1 delivered at 10C compared to 92.71 mAh·g −1 for the pristine LNMO. The synergistic suppression of Mn 3+ formation and parasitic reactions underpins unprecedented high-temperature cyclability, establishing a paradigm for extreme-condition energy storage.
研究领域:
材料科学
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电化学
·
能源存储
·
纳米材料
·
界面化学
·
锂离子电池
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Yang Lyu,Hui Tang,Guangdong Zhao
Polymer-derived ceramics (PDCs), such as silicon oxycarbide and its derivatives, show an exceptional high oxidative stability under extreme conditions. A novel multicomponent silicon oxycarbide system tailoring with transition metal (hafnium) and boron is fabricated by sol-gel and solvothermal method. Amorphous SiHBOC was formed via the condensation of Si–OH, B–OH and Hf–OH groups, respectively, and the bonds of Si–O–Hf and Si–O–B– were detected by FTIR and XPS characterization. After high-temperature pyrolysis, the precursor is converted to a rigid ceramic material that has an 85.8 wt % ceramic yield of SiHfBOC. We investigate the oxidation resistance performance of SiHfBOC using the isothermal oxidation test at 1400 °C. The results showed that the oxidative stability of SiHfBOC was significantly superior to than those of SiBOC ceramic.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Yaning Gong,Dingyu Qiu,Xingchen He,Junhui Shao,Najun Li,Dongyun Chen,Hua Li,Qingfeng Xu,Jianmei Lu
Hybrid HfO 2 -PMA subnanobelts are synthesized by cluster–nuclei co-assembly. • Subnanometer belt morphology enhances piezoelectric polarization response. • Hf-O-Mo interfacial orbital coupling enhances charge separation. • PMA redox pairs act as electron buffers for efficient CO 2 activation. • Dilute CO 2 is efficiently converted into syngas via piezocatalysis. Efficient piezocatalytic conversion of dilute CO 2 into syngas offers a sustainable route for industrial flue gas valorization, yet conventional piezoelectric materials are often constrained by lattice rigidity and rapid charge recombination under weak mechanical stress. Herein, we constructed ultrathin 1D HfO 2 -phosphomolybdic acid (PMA) hybrid subnanobelts (SNBs) via cluster-nuclei co-assembly. The subnanometer architecture and flexible morphology induce an intense polarization response by leveraging the piezoelectric size effect, enabling HfO 2 -PMA SNBs to achieve remarkable CO and H 2 production rates of 4.5 and 5.8 mmol g −1 h −1 , respectively. In-situ FTIR spectra and density functional theory (DFT) calculations reveal that the asymmetric Hf-O-Mo interfacial coordination induces spontaneous electron transfer from HfO 2 to PMA, constructing a robust built-in electric field. Concurrently, the reversible redox properties of PMA clusters further enrich interfacial electron density and facilitate CO 2 adsorption and activation through Hf-O-Mo coupling, lowering the formation energy barrier of the key *COOH intermediates. This interfacial electronic structure engineering strategy establishes a novel paradigm for mechanical-energy-driven CO 2 conversion and offers a new approach for designing emerging sub-nanometer piezocatalysts. Download: Download high-res image (202KB) Download: Download full-size image
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高影响因子
危险品化学品经营许可证（带存储）