Nano Research
·
2020
·Vol. 13
·期 3
·646-652
·
IF 8.183
He Caihong,Yu Lingli,Lu Na,Wang Wenjing,Chen Wei,Lu Shaojie,Yang Yun,Ma Dekun,Huang Shaoming
Heterostructured bimetal nanocrystals with a component having localized surface plasmon resonance (LSPR) property are promising photocatalysts for a series of reactions. In this work, kinetic products of Pd-Ag with a screwdriver-like heterostructure have been successfully fabricated via the selective epitaxial growth of Ag on Pd nanowires (NWs). It was confirmed that the deposition rate ( V deposition ) of Ag is much more sensitive to the temperature, compared to the surface diffusion rate ( V diffusion ) which can be effectively reduced by the binding of poly(vinylpyrrolidone) (PVP) molecules. Then the magnitude of V deposition / V diffusion has been well tailored for the formation of a kinetic growth environment. The interactions between the components of the as-prepared Pd-Ag heterostructures resulted in intensified LSPR effects. As a result, they gained better photocatalytic performance toward solvent free aerobic oxidation of toluene than Pd NWs, Ag NWs and the mixture of them. Additionally, the Pd-Ag heterostructured nanocrystals exhibited excellent catalytic stability for recycling. This work not only presents an idea for realizing kinetic growth but also supports that LSPR effect is a good tool for improving the photocatalytic activity.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·2890-2896
·
IF 3.288
Yinhui Yang,Meiling Qi,Jinliang Wang
Here we report a novel hexaphenylbenzene (HPB)-based material functionalized with six tetraphenylethylene units (BPT) with unique conformation-driven selectivity for gas chromatographic (GC) separations. It is composed of a neat aromatic hydrocarbon with a rigid propeller-like conformation. As a result, the BPT capillary column exhibited high column efficiency of 5340 plates per m and high-resolution capability for aromatic to aliphatic isomers with excellent intra-day and inter-day repeatability and between-column reproducibility. The results demonstrate the unique conformation-driven selectivity of the HPB-based stationary phase, which is rarely reported for chromatography. Moreover, its application in the determination of isomer impurities in commercial products proved its good potential for practical GC analysis. This work presents a new perspective for developing selective stationary phases by engineering their structures.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Lei Bai,Lingling Ma,Lv Li,Anran Zhang,Xiaoming Yan,Fengxiang Zhang,Gaohong He
Anion exchange membrane (AEM) is the heart of alkali electrolyte membrane fuel cells (AEMFCs). To achieve high performance of AEMFC, high conductivity and alkaline stability of AEMs are highly desired. In the present work, we report the synthesis of ether-free polymers with different degrees of Y-shaped branching as AEM materials. Our investigations reveal that incorporating bulky, rigid, and Y-branching units into the polymer backbone can increase the free volume of the AEM and thus help build ion channels with lower hydroxide ion transport resistance. The resultant AEM showed a markedly improved ionic conductivity (116.92 mS/cm at 80 °C), while the simple linear type of the AEM only showed an ion conductivity of 63.63 mS/cm at a similar ion exchange capacity. With such an AEM, the peak power density of the H2/O2 single cell at 60 °C reaches 275 mW/cm2.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Lingling Ma,Manzoor Hussain,Lv Li,Naeem Akhtar Qaisrani,Lei Bai,Yabin Jia,Xiaoming Yan,Fengxiang Zhang,Gaohong He
Octopus-like side chains are introduced in poly(arylene piperidinium)-based alkaline anion exchange membranes (AEMs) to enhance the conductivity and stability. This type of side chain consists of a bulky rigid β-cyclodextrin (β-CD) as the “octopus head”, and long flexible piperidinium ionic liquids as the “arms”. The β-CD unit can enlarge internal free volume of the AEM to reduce ion transport resistance; the “arms” can interact with adjacent hydrophilic ionic groups and water, constructing continuous ion transport channels. The prepared poly(biphenyl piperidinium) AEM with “octopus” side chains at an ion exchange capacity (IEC) of 1.29 mmol g −1 exhibits higher hydroxide conductivity (121.5 mS cm −1 at 80 °C) than that without the “octopus” structure (57.4 mS cm −1 ) although the latter has a larger IEC (1.55 mmol g −1 ). This “octopus” AEM retains 87.2% of its conductivity after being treated in a 1 M NaOH at 80 °C for 480 h. The alkaline H 2 /O 2 fuel cell constructed with this “octopus” AEM produces a peak power density of 469 mW cm −2 ; the cell voltage can be maintained by 85% during 16 h operation. This work illustrates the advantage of “octopus” side chain for enhancement of AEM performance.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yongjiang Yuan,Xinming Du,Hongyu Zhang,Hui Wang,Zhe Wang
The main obstacle of anion exchange membrane fuel cell is the unsatisfactory performance of its key component anion exchange membrane. The AEMs functionalized with organometallic cations have excellent stability and comprehensive performance. Here, we report a series of durable poly (isatin biphenylene) membranes with [Cp-Fe-toluene]+organometallic cation, which have a durability of 1000 h in 1 M KOH at 60 °C, and the hydroxide conductivity of the membrane still remains 81.4%. At the same time, it has excellent dimensional stability (20.55%) and mechanical properties (56.42 MPa). Based on our rational design of [Cp-Fe-toluene]+functionalized poly (isatin biphenylene) membranes, the single cell with this membrane exhibits the peak energy density of 64.4 mW cm −2 in H 2 -air (CO 2 -free) at 60 °C. All these suggest that anion exchange membranes containing metal organic cations have potential.
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MATERIALS & DESIGN
·
2019
·
IF 5.77
Jian Wang,Peiping Zhang,Congcong Wang,Xuda Zheng,Yuanjun Zhao,Lina Li,Shiding Miao
Porous aromatic framework (PAF) materials with π-π conjugation system based on Scholl reaction were found to exhibit satisfying photocatalytic performance, that can successfully degrade Rhodamine B (RhB) and colorless phenol. By selecting different multiple-phenyl building blocks, six kinds of PAF materials named as P-BP materials were successfully constructed by Scholl reaction, which exhibit not only photocatalytic ability, but also moderate specific surface areas, wide solar spectrum coverage, and good thermal and chemical stabilities. Depending on their different building block selections, the photocatalytic performance can be adjusted. The P-BP-DPA was found to exhibit the highest photocatalytic performance with 100% and 50% degradation rate for RhB and phenol in 300 min, respectively. Free radical trapping experiments showed that the photocatalytic activity originated from the strong oxidation capability of photogenerated holes. The band structure of such group of materials can be readily adjusted. With different monomers, their band gaps can be tuned from 1.87 to 2.36 eV, and their valence band positions were adjusted from 1.93 to 3.44 eV (vs NHE).
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JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 43
·期 5
·896-904
·
IF 2.516
Yuan Tian,Yuxia Hou,Quan Yu,Xiaohao Wang,Mengkui Tian
In this study, a new covalent organic framework, consisting of tetra(4-aminophenyl)porphyrin and tris(4-formyl phenyl)amine, was layer-by-layer immobilized on stainless-steel wire as a coating for microextraction. The fabrication process was easy and controllable under mild conditions. The as-grown fiber was applied to extract polycyclic aromatic hydrocarbons in aqueous solution via head-space solid-phase microextraction. Furthermore, it was analyzed by gas chromatography with a flame ionization detector. A wide linear range (0.1–50 µg/L), low limits of detection (0.006–0.024 µg/L, signal-to-noise ratio = 3), good repeatability (intra-fiber, n = 6, 3.1–8.50%), and reproducibility (fiber to fiber; n = 3, 5.79–9.98%), expressed as relative standard deviations, demonstrate the applicability of the newly developed coating. This new material was successfully utilized in real sample extraction with a satisfactory result. Potential parameters affecting the extraction efficiency, including extraction temperature and extraction time, salt concentration, agitation speed, sample volume, desorption temperature, and time, were also optimized and discussed.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Nanjun Chen,Chuanrui Lu,Yunxi Li,Chuan Long,Ziming Li,Hong Zhu
A practical polyelectrolyte system to improve the ion conductivity and lifetime of anion exchange membranes (AEMs) is a critical requirement for alkaline membrane fuel cells (AMFCs). Crosslinking is an effective approach to optimize the performance of AEMs. However, ordinary crosslinkers with a hydrophobic structure always make AEMs mechanically brittle. Herein, in response to the requirement of high-performance AEMs, a series of tunable multi-cation-crosslinked poly(biphenyl piperidinium) (PBP-xQ4) membranes were designed and prepared by embedding flexible cationic crosslinkers. The number of alkyl spacers between the cationic groups in the flexible crosslinkers were optimized to 5 and 6 to achieve optimum performance. These PBP-xQ4 membranes simultaneously have high ion conductivity (155 mS/cm at 80 °C) and good dimensional stability, and these membranes can be folded into many shapes. Besides, the crosslinking also promotes the alkaline stability of these membranes in 2 M NaOH at 80 °C: only a slight degradation is detected by 1 HNMR after alkaline treatment for1800 h. All these impressive results in ion conductivity and durability are attributed to clear nanophase separation in PBP-xQ4 membranes. Moreover, the PBP-xQ4 membrane realizes a maximum power density of 234 mW/cm 2 at 80 °C.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Rui Zhao,Tingting Ma,Shuying Li,Yuyang Tian,Guangshan Zhu
Water contamination by emerging organic pollutants, such as pharmaceuticals and personal care products (PPCPs), is becoming more and more serious. Porous aromatic frameworks (PAFs) are considered as promising adsorbents to remove the PPCPs. To overcome the limitation of PAFs in their powder forms for large-scale applications, herein, we proposed a strategy to covalently anchor PAFs onto electrospun polymer fiber membranes. Polyaniline (PANI) played the role of aromatic seed layer, which was coated on the electrospun polyacrylonitrile (PAN) fiber membrane first. Then, PAF-45 modification was in situ synthesized in the presence of the PANI-coated electrospun PAN fiber membrane. This study could make the PAF-based materials be handled more easily and improve the surface area of electrospun fiber membrane. The obtained composite adsorbent (PAF-45-PP FM) was applied for the adsorption of three PPCPs: ibuprofen (IBPF), chloroxylenol (CLXN), and N,N-diethyl-meta-toluamide (DEET), which exhibited high adsorption capacity and good recycling ability. According to the Langmuir model, the maximum adsorption capacities of PAF-45-PP FM toward IBPF, CLXN and DEET were 613.50, 429.18, and 384.61 mg/g, respectively. In addition, after ten adsorption–desorption cycles, the adsorption capacities toward the three PPCPs decreased slightly. Through an adsorption comparison test, the adsorption capacity of PAF-45-PP FM almost attributed to the loading PAF-45. The adsorption mechanism analysis illustrated that there were pore capture, hydrophobic interaction and π–π interaction between PPCPs and PAF-45-PP FM. Therefore, the PAF-45-PP FM can be potential adsorbents to purify water contaminated with PPCPs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 24
·16263-16275
·
IF 2.993
Li Jiali,Kong Xianggui,Jiang Meihong,Lei Xiaodong
Up to now, although tremendous effort has been made in exploring Pd-based catalysts for the Suzuki–Miyaura coupling reactions, there is still much room to enhance its catalytic performance by synthesis catalyst with define-designed and tailored structure. Herein, a new kind of Pd-based structured catalyst with hierarchical hollow structure (Pd/Co(OH) 2 /Cu(OH) 2 /copper foam) has been successfully synthesized by three facile steps. As framework, the hierarchical hollow nanoarray structure of Co(OH) 2 /Cu(OH) 2 /copper foam is fabricated by immersion and electrolytic deposition methods. Uniformly dispersed Pd nanoparticles with a narrow size distribution (1.5 ± 0.2 nm) are anchored on the surface of the hierarchical nanotube array through an in situ spontaneous redox reaction between Co(OH) 2 and PdCl 4 2− without any surfactant at room temperature. Compared with other synthesis approaches, it just takes less than 1 h for the whole fabrication process in our strategy, exhibiting very high efficiency. In order to evaluate the catalytic performance of the as-prepared structured catalyst, 16 kinds of reagents were chosen as substrates for Suzuki–Miyaura coupling reaction, exhibiting excellent activity and reusability under mild conditions. We hope this simple and efficient method will open a new strategy to design and prepare structured catalysts.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Yinhui Yang,Meiling Qi,Jinliang Wang
This work describes the separation performance of a star-shaped truxene-based material (denoted as EDOTT) as the stationary phase for capillary gas chromatography (GC). The EDOTT capillary column achieved the column efficiency of 5920 plates/m by n -dodecane, 4890 plates/m by naphthalene and 3960 plates/m by 1-octanol at 120 ℃. Its selectivity and retention behaviour were investigated by a number of mixtures of diverse analytes and their isomers. As a result, it showed advantageous performance for separations of apolar to polar analytes, especially phenols and alcohols, over its analogous TTT, TDT and TFT stationary phases. In addition, the EDOTT capillary column was investigated for its column loadability, repeatability and thermal stability, and was finally applied for the determination of isomer impurities in real samples. This work provides an alternative truxene-based stationary phase with high selectivity for polar analytes and demonstrates the key role of structural modification in developing a family of stationary phases with specific selectivity for targeted analytes.
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高影响因子
CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 9
·1249-1256
·
IF 1.401
Zhang Wei,Li Shu-ming,Zhang Jing
In this study, fibrous core–shell silica particles were successfully synthesized via a one-step oil–water biphase stratification coating strategy. The core–shell silica particles were composed of 3-µm non-pore silica cores and thin shells (50–100 nm), which have radial-like direct channels and a large pore size (19.89 nm). The fibrous core–shell silica particles were further modified by n-octadecyltrichlorosilane and used as stationary-phase media in high-performance liquid chromatography (HPLC). The chromatographic properties of the particles were systematically studied in small-molecule and protein separation processes. The results showed that the back pressure was as low as 8.5 MPa under the 1.0-mL min −1 flow velocity. Furthermore, fibrous core–shell silica particles with an 80-nm shell were used for separating seven small molecules within 10 min and six proteins within 6 min. This work demonstrates that the fibrous core–shell silica particles could be used as an HPLC stationary phase with good performance and low back pressure, and that they have great potential for application to HPLC separation in the future.
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