ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Qing Wang,Mao Ye,Li Xu,Zhi-guo Shi
A mixed-mode chromatographic packing material, C18 and diol groups modified silica (C18-Diol), was prepared with controllable hydrophobicity and hydrophilicity . It demonstrated excellent aqueous compatibility and stability in aqueous mobile phase ; compared to the traditional C18 column, improved peak shape of basic analytes was also obtained. Additionally, it exhibited both reversed-phase liquid chromatographic (RPLC) and hydrophilic interaction chromatographic (HILIC) performance; the analyte separation scope was thus enlarged, demonstrated by simultaneous separation of twenty acids, bases and neutrals. More interestingly, a novel on-line two-dimensional liquid chromatography on the single column (2D-LC-1C) was established by modifying the high performance liquid chromatographic instrument only with the addition of an extra six-port two-position valve. The early co-eluted components of the extract of Lonicera japonica on the 1st-dimension (RPLC) were collected for the online re-injection to the 2nd-dimension (HILIC) by conveniently varying the mobile phase components. Six more peaks were obtained. The established system was simple, easy operation and low cost, which had advantages in analyzing complicated samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 19
·4559-4569
·
IF 3.431
Xu Jia,Li Yunfang,Li Cao,Zhang Rui,Xiao Yuxiu
A hexafluoroisopropanol (HFIP)-mediated cloud point extraction (CPE) system was established. A small amount of HFIP (even 1%, v / v ) can dramatically reduce the cloud point of Triton X-100 (TX-100) aqueous solution (even to 1 °C) and make liquid-liquid two-phase separation (coacervate phase and aqueous phase) occur at room temperature over a wide range of TX-100 concentration (0.5∼10%, g/mL). HFIP-mediated coacervate phase has smaller volume (volume ratio is 1.8∼8.9% relative to the volume of the total solution with 1∼5% TX-100) and larger micelle aggregates (30∼80 nm in diameter) compared to temperature-induced coacervate phase (volume ratio at 2.8∼14.0%, the diameter of micelle aggregates at 5∼30 nm). HFIP-mediated CPE was coupled to high-performance liquid chromatography with ultraviolet detection (HPLC-UV) for the extraction and detection of organic pollutants in water, namely, polycyclic aromatic hydrocarbons (PAHs), fluoroquinolones (FQs), and sulfonamides (SAs) with different polarities, charges, and hydrogen-bonding properties. HFIP-mediated CPE provides much higher extraction rates (ERs) and enrichment factors (EFs) for FQs (91∼106%, 50∼59), PAHs (63∼90%, 33∼49), and SAs (26∼55%, 16∼34) compared with the temperature-induced one (ERs: 4∼8% for FQs, 25∼46% for PAHs, and 4∼37% for SAs; EFs: 1∼3 for FQs, 6∼12 for PAHs, and 8∼13 for SAs). The limit of detection ranges from 0.24 to 0.33 ng/mL for FQs, 0.04 to 0.38 ng/mL for PAHs, and 0.63 to 1.31 ng/mL for SAs. The proposed method was applied in the analysis of real water samples, and the recovery of 79.4∼110.8% and the relative standard deviation of 0.2∼16.3% were achieved for the three types of pollutants.
Schematic illustration of HFIP-mediated cloud point extraction
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xunwang Tang,Zongxue Yu,Junlei Tang,Guangcheng Yang,Xiuzhu Zhang,Yu Chen,Jiajia Hou,Hongye Xu,Jianjun Wu
The development of anion-exchange membrane water electrolyzers (AEMWE) offers significant potential for sustainable hydrogen production, but the practical adoption of anion exchange membranes (AEMs) is hindered by their inherent performance limitations. To overcome this challenge, we developed a series of poly (biphenylene-co-1,2-diphenylethane) piperidine AEMs featuring grafted hydrophobic fluorinated side chains by precisely controlling the grafting rate. The fluorinated side chains not only promote microphase separation and reduce ionic conduction resistance, but also significantly enhance the dimensional stability of the AEMs. Specifically, the QPBDP-TF-40 membrane exhibits good ionic conductivity (163.6 mS cm −1 at 80 °C), and with increasing grafting rate the QPBDP-TF-80 membrane exhibits low swelling rate (16 % at 80 °C). QPBDP-TF-60 shows good chemical stability with ionic conductivity retention of 78.3 % after 1000 h immersion in 2 M NaOH solution at 80 °C. In addition, the membrane electrode assembled based on QPBDP-TF-40 membranes exhibits considerable current density in AEMWE (1.36 A cm −2 achieved at 2.1 V) and stable operation at a current density of 500 mA cm −2 for 72 h. The above results indicate that fluoride-grafted QPBDP-TF-X exhibits a large potential for application in AEMWE.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xunwang Tang,Zongxue Yu,Junlei Tang,Guangcheng Yang,Xiuzhu Zhang,Yu Chen,Jiajia Hou,Jianjun Wu
The Anion Exchange Membrane Water Electrolyzer (AEMWE) had emerged as a research hotspot in the field of clean energy due to its potential for low cost and high efficiency. However, the trade-off between ionic conductivity and long-term alkaline stability of anion exchange membranes (AEMs) severely limited their commercial applications. To address this challenge, this study proposed an innovative dual-cation crosslinking strategy and, for the first time, designed and synthesized a series of cross-linked AEMs based on poly (biphenyl-co-dibenzothiophene piperidine). By introducing hydrophilic cationic crosslinkers, this strategy not only significantly optimized the microphase separation morphology of the membranes and constructed efficient ion transport channels, but also achieved a synergistic improvement in ionic conductivity and mechanical properties. Specifically, the crosslinked membrane PBDB-MP-10 exhibited satisfactory OH – conductivity (126.1 mS cm −1 at 80 °C) and swelling (20.9 % at 80 °C), and maintained good alkali stability with a conductivity retention of 81.1 % after immersion in alkaline solution (2 M NaOH at 80 °C) for 1080 h. Moreover, membrane electrodes composed of PBDB-MP-10 membranes were examined at AEMWE, yielding a current density of 1.09 A cm −2 at 2.2 V and operating consistently at a constant current of 200 mA cm −2 for a duration of 80 h. The outcomes suggested that AEM with dual-cation cross-linking had considerable potential as a material for water electrolysers.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiaoyu Tang,Miao Bai,Ahu Shao,Zhiqiao Wang,Helin Wang,Min Zhang,Yue Ma
Prelithiation is key to extending the lifespan of anode-free lithium-metal batteries (AFLMBs) by compensating for irreversible lithium loss. However, current prelithiation agents suffer from poor processability and sensitivity to temperature and humidity, limiting their use in conventional manufacturing. In this study, we introduce a novel high-prelithiation-capacity (~ 720 mAh g-1), ambient environment stable LiF/carbon nanocomposite as the sacrificial agent, specifically designed to stabilize high-energy, ampere-hour-level anode-free lithium-metal batteries. The nanocomposite's design, with LiF nanodots embedded in a carbon matrix, balances high lithium retrievability with compatibility with existing battery manufacturing processes. Additionally, the carbon matrix facilitates the delithiation process of the LiF nanocrystals. In an Ah-level anode free pouch cell (LiNi1.5Mn0.5O4 cathode paired with bare Cu foils) the nanocomposite enabled an energy density of 278.2 Wh kg-1 energy density and 66.9% capacity retention after 200 cycles. Operando transmission-mode X-ray diffraction tracking reveals the lithium-supplementation process of the LiF/C agent, as well as enhanced reversibility of the phase transition during cycling. These findings suggest that the nanocomposite is a promising material for energy-dense, anode-free cell development.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Zhanyu Li,Yiman Gu,Yanchao Zhang,Zhe Wang,Di Liu,Tianming Dong,Xiaoyu Chi,Jingyi Wu,Yijia Lei
Anion exchange membrane (AEM) with excellent electrical conductivity and high stability has become the main goal of the development of high performance fuel cells . In this work, in order to improve the performance, we will select an effective design strategy with an ether-free (biphenyl-isatin-piperidine) polymer as the main chain. After amination of the chain, the high alkaline resistant piperidine cation serves as a functional group to enhance the alkaline resistance of AEM. At the same time, the hydrophilic flexible spacer chain is introduced to create the phase separation morphology of hydrophilic and hydrophobic water, and to further improve the ion transmission efficiency. It is noteworthy here that PBIP-90-TGM-5 AEM can reach the hydroxide conductivity of 134.21 mS cm −1 at 80 °C, and the prepared PBIP-90-TGM-5 AEM have obvious nanoscale microphase separation morphology, which ensures the membrane has good mechanical properties and dimensional stability. On this basis, PBIP-90-TGM-5 also showed good alkaline stability, and the retention rate was still 81.41 % after 1152 h of 5 M NaOH aqueous solution. At the same time, the peak power density of PBIP-90-TGM-5 at a temperature of 80 °C and an open circuit voltage of 0.94 V can reach 235.7 mW cm −2 . This study confirms that poly (biphenyl-isatin-piperidine) has great potential as an AEM for fuel cells.
✓ 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）