Catalysts
·
2019
·Vol. 9
·期 8
·672
·
IF 3.444
Xinya Pei,Xiaoxue Liu,Xiaoyu Liu,Jinling Shan,Hui Fu,Ying Xie,Xuemin Yan,Xianzhu Meng,Yancheng Zheng,Geng Li,Qi Wang,Hao Li
Hierarchical titanium silicalite-1 (HTS-1) zeolites are an important class of catalytic materials due to their enhanced mass transfer and improved catalytic performance. In this study, HTS-1 zeolites have been successfully prepared by the hydrothermal crystallization of carbon-silica-titania (CST) composites. Compared with the direct carbonization method, the mild carbonization of SiO2-TiO2/Tween 40 xerogel in the presence of sulfuric acid can effectively improve both the content and mesoporous structure of carbon material in the CST composites, which enables carbon materials to better play the role of a mesoporous template during the crystallization process. The resultant zeolite has both ordered micropores and interconnected mesopores and macropores, which are similar to the skeleton of the carbon template trapped in the TS–1 crystals. Moreover, the HTS–1 zeolite displays outstanding catalytic performance in oxidative desulfurization of bulky sulfur compounds.
研究领域:
材料科学
·
催化化学
·
纳米多孔材料
·
环境催化
·
能源化工
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 10
·3990-3998
·
IF 3.806
Junli Wang,Hui Feng,Kangmin Chen,Weiling Fan,Qing Yang
A facile catalytic growth route was developed for the low-temperature solution synthesis of Ag2S–CdS matchstick-like heteronanostructures in oleylamine, which are composed of a Ag2S spherical head and a CdS rod-like stem. Ag2S nanoseeds acted as an effective catalyst for the growth of CdS nanorods and remained at the tip of the resultant nanorods, leading to the formation of Ag2S–CdS heterostructures with a matchstick shape. The diameter of the Ag2S heads and the length of the CdS stems could be easily controlled by varying the molar ratios of the Ag/Cd precursors. The differential scanning calorimetry (DSC) and variable-temperature X-ray diffraction (XRD) studies confirmed that Ag2S catalytic seeds underwent a phase change, that is, they were in a high-temperature superionic conducting cubic structure during the CdS nanorod growth and then converted to a low-temperature monoclinic crystal structure as the reaction was cooled to room temperature. The influence of synthetic temperature on the product morphology was investigated and the morphological evolution at different growth stages was monitored using transmission electron microscopy (TEM). Furthermore, the growth kinetics of the Ag2S–CdS matchstick-like heteronanostructures, including the dissolution, nucleation and growth of CdS within the Ag2S catalyst, was reasonably discussed on the basis of the structural characteristics of the superionic cubic Ag2S catalyst and the low solubility of CdS in Ag2S derived from the Ag2S–CdS binary phase diagram.
研究领域:
材料化学
·
纳米科学与技术
·
无机化学
·
物理化学
·
半导体材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 55
·44128-44136
·
IF 3.84
Yufang Tao,Qian Ni,Mingyu Wei,Dongsheng Xia,Xiaoxia Li,Aihua Xu
Semiconducting carbon nitride materials (g-C3N4) were investigated as metal-free catalysts for the activation of peroxymonosulfate (PMS) under visible light irradiation to degrade organic dyes in aqueous solution. X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the properties of the material. The effect of several parameters including the concentration of catalyst, PMS and organic dye, and initial solution pH on its catalytic activity was also investigated. It was found that the obtained g-C3N4 can effectively activate PMS under visible light irradiation to generate strong sulfate radicals which was highly active for Acid Orange 7 (AO7) and other organic dyes degradation. The catalyst also presented a long-term stability during multiple runs. Based on intermediate detections, the degradation pathway of AO7 in the g-C3N4/PMS/Vis system was proposed. This study demonstrated a promising approach for the activation of green oxidant, PMS, by the newly-developed polymer photocatalysts for environmental remediation and oxidation catalysis.
研究领域:
环境化学
·
光催化
·
材料科学
·
水处理技术
·
氧化催化
·
纳米材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Bin Qin,Yifei Cai,Xiaoqing Si,Chun Li,Jian Cao,Weidong Fei,Junlei Qi
The practical application of lithium-sulfur (Li-S) batteries is impeded by the shuttle effect of intermediate polysulfides and the inherent sluggish kinetics. Herein, Mo 2 C nanocatalysts anchoring on holey graphene scaffold (Mo 2 C@HGr) is explored as a lightweight and ultrathin modified separator to conquer the above issues. The artificially customized holes on holey graphene sheets facilitate ionic transfer and electrolyte penetration, and further enhance the sulfur utilization under lean electrolyte conditions. The experimental results together with theoretic calculation demonstrate the favourable chemical adsorption ability of Mo 2 C sites that blocking the diffusion of LiPSs. Abundant triple-phase interfaces among Mo 2 C nanomediators, holey graphene and electrolyte boost the conversion kinetics of the intercepted LiPSs. As a result, the cell with Mo 2 C@HGr modified separator shows superior rate capability (836 mAh g −1 ) even at 5 C current with a negligible Mo 2 C@HGr loading of 0.08 mg cm −2 . Furthermore, ultrahigh areal capacity of 5.9 mAh cm −2 is still attained with high sulfur loading of 6 mg cm −2 under lean electrolyte operation (E/S = 5.6 µL mg −1 ). This design concept can be extended to other graphene based multifunctional nanocomposite toward the development of more practical Li-S batteries.
研究领域:
电化学
·
能源材料
·
纳米催化
·
电池技术
·
功能复合材料
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 47
·2303746
·
IF 13.3
Yayun Zheng,Shasha Wei,Jitao Shang,Du Wang,Cheng Lei,Yan Zhao
To make sodium-ion batteries a realistic option for everyday energy storage, a practicable method is to enhance the kinetics of Na + reactions through the development of structurally stable electrode materials. This study utilizes ternary Sn-based dichalcogenide (SnS 1.5 Se 0.5 ) in the design of electrode material to tackle several issues that adversely hinder the performance and longevity of sodium-ion batteries. First, the incorporation of Se into the SnS structure enhances its electrical conductivity and stability. Second, the ternary composition restricts the formation of intermediates during the desodiation/sodiation process, resulting in better electrode reaction reversibility. Finally, SnS 1.5 Se 0.5 lowers the diffusion barrier of Na, thereby facilitating rapid and efficient ion transport within the electrode material. Moreover, nitrogen and sulfur dual-doped carbon (NS-C) is used to enhance surface chemistry and ionic/electrical conductivity of SnS 1.5 Se 0.5 , leading to a pseudocapacitive storage effect that presents a promising potential for high-performance energy storage devices. The study has successfully developed a SnS 1.5 Se 0.5 /NS-C anode, exhibiting remarkable rate capability and cycle stability, retaining a capacity of 647 mAh g −1 even after 10 000 cycles at 5 A g −1 in half-cell tests. In full-cell tests, Na 3 V 2 (PO 4 ) 3 //SnS 1.5 Se 0.5 /NS-C delivers a high energy density of 176.6 Wh kg −1 . In addition, the Na + storage mechanism of SnS 1.5 Se 0.5 /NS-C is explored through ex situ tests and DFT calculations. The findings suggest that the ternary Sn-based dichalcogenides can considerably enhance the performance of the anode, enabling efficient large-scale storage of sodium. These findings hold great promise for the advancement of high-performance energy storage devices for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
固态化学
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Zilin Ruan,Jianchen Lu,Baijin Li,Qizan Chen,Zhenliang Hao,Lei Gao,Jinming Cai
Structural defects in two-dimensional materials offer an effective way to engineer their functionalities. In-situ local measurements to build the structure-function relationship are crucial for future device technology. Here, we present a comprehensive study of intrinsic defects in single-layer WS 2 grown by chemical vapor deposition using a combination of scanning tunneling microscopy/spectroscopy, non-contact atomic force microscopy and density functional theory calculations. We probed the rarely observed positively charged defects and the intersection of adjacent charging rings at sufficiently high bias caused by subsurface defects. We also directly identified and visualized the widely observed negatively charged defects as chalcogen vacancies-related defects. The results reported here will guide future efforts of targeted defect engineering and doping of the single-layer transition metal dichalcogenides .
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
表面科学
·
二维材料
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Zhipeng Jiang,Hui-Juan Guo,Ziqi Zeng,Zhilong Han,Wei Hu,Rui Wen,Jia Xie
An ultrathick lithium metal anode (LMA) is a prerequisite for developing practical lithium–sulfur (Li–S) batteries that simultaneously meet the requirements of high areal capacity, lean electrolyte, and limited excess Li. Inspired by the electrochemical process for an organosulfur cathode, herein, we reconfigure such a sulfur cathode by using an overlithiation strategy to enable the formation of a high performance LMA. Specifically, an applicable ultrathick LMA is successfully constructed by overlithiating a well-known organosulfur cathode material, sulfurized polyacrylonitrile (SPAN). SPAN contains a polymeric pyridine structure with an outstanding lithium-ion affinity, so that it can act as a lithiophilic matrix. More importantly, a Li2S-rich solid electrolyte interphase (SEI) can be generated on the surface of SPAN during the overlithiation process. The synergistic effect of the lithiophilic matrix and a robust SEI leads to a dense deposition of lithium, which enables one to form an ultrathick LMA (159 μm, 30 mAh cm–2) with high Coulombic efficiency (99.7%). Such an LMA paired with a sulfur cathode of high areal capacity (up to 16 mAh cm–2) shows stable cycling under practical conditions of a lean electrolyte (2.2 μL mgS–1) and a negative-to-positive capacity (N/P) ratio as low as 1.3. The applicability of the ultrathick LMA was further verified with Li–S pouch cells, indicating a highly prospective route toward realization of practical Li–S batteries.
研究领域:
储能技术
·
电化学
·
材料科学
·
纳米技术
·
电池技术
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 81
·期 10
·2078-2091
·
IF 1.638
Dong Shuyu,Zhai Xiaoxue,Pi Ruobing,Wei Jinbao,Wang Yunpeng,Sun Xuhui
Degradation of naproxen (NAP) by persulfate (PS) activated with zero-valent iron (ZVI) was investigated in our study. The NAP in aqueous solution was degraded effectively by the ZVI/PS system and the degradation exhibited a pseudo-first-order kinetics pattern. Both sulfate radical (SO 4 •− ) and hydroxyl radical (HO • ) participate in the NAP degradation. The second-order rate constants for NAP reacting with SO 4 •− and HO • were (5.64 ± 0.73) × 10 9 M − 1 s − 1 and (9.05 ± 0.51) × 10 9 M − 1 s − 1 , respectively. Influence of key parameters (initial pH, PS dosage, ZVI dosage, and NAP dosage) on NAP degradation were evaluated systematically. Based on the detected intermediates, the pathways of NAP degradation in ZVI/PS system was proposed. It was found that the presence of ammonia accelerated the corrosion of ZVI and thus promoted the release of Fe 2+ , which induced the increased generation of sulfate radicals from PS and promoted the degradation of NAP. Compared to its counterpart without ammonia, the degradation rates of NAP by ZVI/PS were increased to 3.6–17.5 folds and 1.2–2.2 folds under pH 7 and pH 9, respectively.
研究领域:
环境科学
·
化学
·
水处理技术
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Zhi Yuan Xie,Wan Xiang Qiu,Zi Yi Xu,Nian Bing Li,Hong Qun Luo
Hydrogen sulfide (H 2 S) has a comprehensive contribution to the normal operation and stability of organisms and is also present in environmental water samples and food deterioration. Thus, it is exceedingly promising and significant to develop a highly sensitive detection technique for tracing H 2 S. Inspired by this, we designed and synthesized a new fluorescent probe 2-[3-[2-[3-bromo-4-(2,4- dinitrobenzenesulfonate)] ethenyl]-5,5-dimethyl-2-cyclohexen-1-ylidene]propanedinitrile (SP-Br) for hydrosulfide ion detection by introducing bromine atom. Compared with reported H 2 S probes based on the same fluorescent parent, SP-Br has longer fluorescence emission (λ em = 670 nm), shorter response time (3 min), lower detection limit (149 nM), and wider detection range (0–30 nM). SP-Br can emit weak yellow fluorescence, and the emission intensity at 670 nm is considerably enhanced in the presence of hydrosulfide ions. The identification mechanism of hydrosulfide ion by SP-Br was verified by high-resolution mass spectrometry, fluorescence, and UV–vis absorption spectroscopy. In addition, SP-Br has been successfully applied to the monitoring of actual water samples and beer samples and has certain development prospects and value in the fields of environmental pollution and food quality analysis.
研究领域:
生物化学
·
环境科学
·
食品科学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Zewen Yang,Dandan Jia,Qing Zhao,Depeng Song,Xiaolin Sun,Yuan Zhang,Jing Gao,Takeo Ohsaka,Futoshi Matsumoto,Qiang Shen,Jianfei Wu
The development of lithium-chalcogen batteries containing one active species is limited by bottlenecks. Multichalcogen composites that integrate the advantages of each component while avoiding their defects are desired. Herein, carbon nanotubes (CNT) and carboxylated-CNT (CCNT) are adopted as carriers for active substances consisting of S, Se, and Te at a feed ratio of 8:1:1 (SST811). The electrochemical performance of SST811/CCNT is better than that of SST811/CNT because CCNT contains more oxygen-containing functional groups, allowing the active species to be firmly anchored. Cyclic voltammetry (CV) curves, charge-discharge profiles and in-situ Raman results reveal the solid-phase charge-discharge mechanism of SST811/CCNT in ester electrolyte, consisting of a combination of basic reaction steps. To suppress the shedding of active species during long cycling, a carbon cloth (CC) interlayer is introduced between cathode and separator without altering the inherent reaction mechanism of SST811/CCNT. Under the protection of CC interlayer, the capacity of SST811/CCNT remains at 1219.2 mAh g −1 after 300 cycles, which is 1.5 times that without interlayer. The protective effect of CC interlayer is demonstrated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman results. This work inspires the further development of lithium-chalcogenide batteries.
研究领域:
电化学
·
材料科学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1424-1432
·
IF 8.897
Song Ning,Xi Baojuan,Wang Peng,Ma Xiaojian,Chen Weihua,Feng Jinkui,Xiong Shenglin
The exploitation of new sulfiphilic and catalytic materials is considered as the promising strategy to overcome severe shuttle effect and sluggish kinetics conversion of lithium polysulfides within lithium-sulfur batteries. Herein, we design and fabricate monodisperse VN ultrafine nanocrystals immobilized on nitrogen-doped carbon hybrid nanosheets (VN@NCSs) via an one-step in-situ self-template and self-reduction strategy, which simultaneously promotes the interaction with polysulfides and the kinetics of the sulfur conversion reactions demonstrated by experimental and theoretical results. By virtue of the multifunctional structural features of VN@NCSs, the cell with ultrathin VN@NCSs (only 5 µm thickness) modified separator indicates improved electrochemical performances with long cycling stability over 1,000 cycles at 2 C with only 0.041% capacity decay per cycle and excellent rate capability (787.6 mAh·g −1 at 10 C). Importantly, it delivers an areal reversible capacity of 3.71 mAh·cm −2 accompanied by robust cycling life.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chang Liu,Long-Ji Yuan,Yue Zhang,Bo Liu,Fang-Wei Ding,Yi-Xing Li,Yun-Kun Dai,Jian Liu,Xu-Lei Sui,Zhen-Bo Wang
Transition metal chalcogenides (TMCs) have demonstrated great potential in energy storage devices due to their versatile structures and composite functionalities. However, the application of TMCs in potassium-ion batteries (PIBs) suffers from the issues of large volume expansion, polysulfide dissolution, and sluggish kinetics. To overcome these challenges, this work develops nano-flower-like MnS-Co 3 S 4 confined in poly-pyrrole (PPY) carbon nanotube (denoted as MS-CS-PPY) as an excellent anode in PIBs. The nitrogen-doped PPY framework facilitates the interface electron transfer , confines active materials MS-CS effectively, and mitigates the volume change, thus resulting in boosted reaction kinetics and exceptional cycling stability. TMCs induce the surface capacitance and enable the chemical anchoring of the charge/discharge products during the potassium/de-potassium process. Moreover, this work reveals the potassium/de-potassium reaction mechanism, redox kinetics, and solid electrolyte interphase formation of MS-CS-PPY in different electrolytes through theoretical calculations and experimental studies. The solvation ability of electrolytes plays a vital role in manipulating the redox kinetics of the MS-CS-PPY anode material . This study offers feasible strategies for electrode design and electrolyte selection for developing TMCs negative electrodes in future PIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）