APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Xiaopeng Huang,Xiaojing Hou,Jincai Zhao,Lizhi Zhang
In this study, we demonstrate that ferrous ions confined on the hematite facets can significantly promote the H 2 O 2 decomposition to produce •OH for more efficient organic contaminants degradation than the unconfined counterparts, while hematite nanorods with exposed {0 0 1} and {1 1 0} facets exhibit better confining effect than nanoplates with exposed {0 0 1} facets. Experimental results revealed that the H 2 O 2 decomposition efficiency of hematite facet confined ferrous ions was affected by the amount of surface confined ferrous ions, and also governed by the binding mode of ferrous ions on the hematite facets. We interestingly found that the polar {1 1 0} facets could confine ferrous ions of higher density with a five-coordination binding mode and thus lower the H 2 O 2 decomposition energetic span more efficiently than the nonpolar {0 0 1} facets, which confined ferrous ions with a six-coordination binding mode. The specific surface area normalized •OH formation rate constants were, respectively, 5.50 × 10 −3 and 1.04 × 10 −2 s −1 for hematite nanoplates and nanorods confined ferrous ions, which were 1.2 and 2.2 times that (4.75 × 10 −3 s −1 ) of the unconfined counterpart. Moreover, rhodamine B could be efficiently degraded in the presence of hematite (0.4 g L −1 ), Fe 2+ (5.0 × 10 −5 mol L −1 ) and H 2 O 2 (5.0 × 10 −5 mol L −1 ) at pH 4.7, along with 23.6% and 72.5% of H 2 O 2 consumption efficiencies for hematite nanoplates and nanorods, respectively. Meanwhile, 6.6% and 11.8% of nitrogen in rhodamine B were converted to NO 3 − in the hematite nanoplates and nanorods confined ferrous ions Fenton systems, respectively. It was found that N -deethylation, destruction of chromophores, opening-ring and mineralization occurred during the confined ferrous Fenton rhodamine B oxidation process. This study can deepen our understanding on the enhanced reactivity of ferrous ions bound on the surface of iron oxides, and also shed light on the design of high efficient heterogeneous Fenton catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Weijun Zhou,Minfeng Chen,Qinghua Tian,Jizhang Chen,Xinwu Xu,Xiang Han,Junling Xu
Thanks to high safety and low cost, rechargeable zinc-ion batteries (RZIBs) have become a promising candidate for grid-scale energy storage systems. However, zinc anodes suffer from severe dendrite growth and irreversible side reactions, leading to poor cyclability of RZIBs. In this work, low-cost sodium lignosulfonate (SL) is utilized as the electrolyte additive to solve this problem. The added amount of SL is optimized to be 0.02%, which enables the Zn//α-MnO 2 battery to deliver a large capacity of 146 mAh g −1 after 1000 cycles at 1 A g −1 , corresponding to a high capacity retention of 83.5%. The Zn//Zn symmetric cell with the modified electrolyte also shows excellent cyclability even under a commercial level of areal specific capacity (4 mAh cm −2 ). Overall, the results of this study confirm that the SL additive can improve the ionic conductivity of electrolyte, restrict the two-dimensional planar diffusion of Zn 2+ ions at the electrode/electrolyte interface, lower the nucleation overpotential of Zn 2+ ions, prevent side reactions, and inhibit the corrosion of Zn metal. Therefore, the dendrite growth and byproduct formation can be effectively suppressed. This study provides new insights into protecting metal electrodes of electrochemical energy storage devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xiaoxia Zhang,Ru Song,Xinyan Liu,Yan Xu,Rongbian Wei
Poor water solubility is one of the main adverse factors for vitamin D 3 to be used as a fortifier in water-soluble food system. In this study, a phase transformation based nanoemulsion fabrication process was developed to encapsulate vitamin D 3 with Tween 80 and Span 80 as a composite surface-active surfactant (named as Vit D 3 NEs). The encapsulation efficiency of vitamin D 3 in resultant oil in water nanoemulsions reached 99.9%. The prepared Vit D 3 NEs was spherical with average particle size of 391.47 ± 12.89 nm, polydispersity index of 0.23–0.31, and endothermic temperature of 127.1 ℃. Results of FTIR indicated that hydrophobic, electrostatic and hydrogen bond interactions were involved in Vit D 3 NEs fabrication. Compared to un-encapsulated Vit D 3 (bare Vit D 3 ), Vit D 3 NEs displayed higher stability under gastric digestion, and sustained release under intestinal digestion. The cumulative release of Vit D 3 reached 69% after 5 h of intestinal digestion. Further, Vit D 3 NEs demonstrated stronger thermal stability than the bare Vit D 3 at 40–60 °C, and the first-order kinetics was well fit to describe its thermal degradation . Our work suggests a new insight into the application of Vit D 3 NEs stabilized by Tween 80 and Span 80 in food industry.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9339-9349
·
IF 8.867
Zhenggang Zhang,Zhe Peng,Jieyun Zheng,Susu Wang,Zixuan Liu,Yujing Bi,Yousi Chen,Gang Wu,Hong Li,Ping Cui,Zhaoyin Wen,Deyu Wang
Attempts to utilize lithium metal in secondary batteries are seriously restricted by its uncontrollable side reactions with the electrolyte solvent. Here we utilize a protective porous structure based on the pyrolyzed PAN binder to stabilize the electrolyte/lithium interface to prolong its working life. With the increase of pyrolysis temperatures, the treated PAN fibers possess two mutational points in mechanical properties located at ∼300 & ∼700 °C, and exhibit carbon-like characteristics at ∼400 °C and higher. Compared to the control electrode, the cyclic life-span of the treated electrodes can increase 1.8 times at the first mutational point, and surprisingly rise to 12 & 7 times for the samples pyrolyzed at 400 & 500 °C, then fall back to 1.6 times at the second mutational point. These results reveal that the stable operation of lithium plating/stripping could be provided by the internal interwoven SEI layer grown on the carbon-like binder network with appropriate rigidity. Among the investigated systems, the protective structure treated at 400 °C can stably operate for 350 cycles with an average coulombic efficiency as high as ∼98%, which is the best efficiency recorded for carbonate-based electrolytes to date.
研究领域:
材料科学
·
储能
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14368-14384
·
IF 2.478
Hu Yongcai,Du Zhaofu,Yao Yingbang,Ma Yue,Li Yi,Xu Yiwen,Zhao Xiaobo,Tao Tao,Liang Bo,Lu Shengguo
Silver powders were prepared by a chemical reduction method. Effects of different surfactants during this preparation process were examined. Using these silver powders, silver pastes were prepared for low temperature co-fired ceramics (LTCC) applications. Another batch of different surfactants were added into the silver paste and evaluated. Moreover, various organic thixotropic agents were used to modify the thixotropy behavior of the silver paste. It was found that the surfactants of PVP (Polyvinyl pyrrolidone, for preparation of the silver powder) and Span-85 (for the preparation of silver paste) exhibited the best performance, with an electrical resistivity of 0.11 mΩ mm. The silver paste with the thixotropic agent of hydrogenated castor oil shows the largest thixotropic index of 1.56. Using different organic additives, the microstructural, rheological and electrical properties of the silver paste can be considerably improved, and our results shed light on the optimization of the silver paste for LTCC applications.
研究领域:
材料科学
·
化学工程
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Feiyue Zhai,Xiayu Zhu,Wenfeng Zhang,Gaoping Cao,Huimin Zhang,Yalan Xing,Yu Xiang,Shichao Zhang
Recently, spinel high-entropy oxide (HEO) anode materials have garnered extensive attention for high-energy lithium-ion batteries due to their high specific capacity. Many studies have explored its energy storage mechanism, but few have paid attention to its characteristics in long cycle life. In this work, the whole life cycling performance of (FeCoNiCrMn)-HEO is presented and investigated for the first time. Distinct capacity trends are studied to divide the cycling life into three stages: activation, upgradation, and degradation. Ex situ morphological characterizations are conducted to reveal that the driving force of stage change is continuous particle fragmentation. As a result, refined particles promote conversion reaction reversibility and induce extra interfacial capacity, achieving 2831 mAh g −1 at 825 cycles. Density functional theory (DFT) calculations provide a deeper insight into the high entropy effect on the ultra-high extra interfacial capacity. However, continuous refinement brings about huge electrolyte interface-derived layers, which are also responsible for pre-decay and post-collapse. The view of the evolution of the lithium storage mechanism is explicitly presented and experimentally verified by high-energy ball milling and fluorinated vinyl carbonate (FEC). These above results can give practical solutions to design high specific capacity and long-life cycle stability HEO anode in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xinyou Zhang,Yutong Yang,Jianxin Wang,Jianjiao Xin,Wendi Wang,Yao Chen,Guangming Yin,Hong Pan
Among various cathode materials, sulfurized polyacrylonitrile (SPAN) is considered a highly promising cathode for Lithium-sulfur (Li-S) batteries due to its unique covalent sulfur fixation mechanism, which fundamentally suppresses polysulfide dissolution and the shuttle effect. However, conventional SPAN materials typically limit sulfur chains to short S 2 -S 4 structures to maintain a solid-solid reaction, restricting their theoretical capacity. Moreover, the material's insulating nature and significant volume changes during cycling greatly limit its electrochemical performance and practicality. To address these issues, this study designed and synthesized a high-elasticity water-based binder based on a 2-ethylhexyl acrylate/acrylic acid/methyl methacrylate (2-EHA-AA-MMA) terpolymer. Abundant carboxyl groups (-COOH) in its molecular chain form stable S-O covalent bonds with sulfur chains in SPAN. Combined with PAN's terminal fixation of sulfur chains, this achieves a synergistic “long-chain capacity enhancement and strong anchoring shuttle suppression” effect. It stabilizes long S 6 chains, improving cycling stability and reversible capacity, while also directing S 6 conversion directly to Li 2 S 3 , bypassing soluble Li 2 S 4 intermediates to suppress shuttle effects at the source. Experimental results show that the SPAN cathode with this binder delivers a high specific capacity of 850.3 mAh g −1 at 0.1 C, with 68.4% capacity retention after 100 cycles and effective polysulfide shuttle suppression.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）