NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 17
·6753-6764
·
IF 3.069
Qiannan Li,Yuguo Xia,Kangliang Wei,Xiaotong Ding,Shun Dong,Xiuling Jiao,Dairong Chen
Utilizing surface polarization to improve the separation efficiency of photoinduced carriers is considered to be an effective strategy to enhance the photocatalytic activity. Herein, a novel nonprecious metal-based P-doped g-C3N4 (PCN)/polyaniline (PANI)/BaTiO3 (BTO) (PPB) ternary photocatalyst with a hollow architecture was rationally designed and prepared by a combined wet-chemical and thermal treatment strategy. Except for the Z-scheme involved in PCN and PANI, the vertical polarization provided by ferroelectric BTO further improved the separation efficiency of the photoinduced charge carrier, resulting in an enhanced visible-light photocatalytic hydrogen production activity of 602 μmol h−1 g−1, which was 21-fold higher than that of pristine g-C3N4, and an apparent quantum efficiency of 4.16% at 420 nm. In addition, benefitting from this ternary heterojunction, the photoinduced electrons were concentrated on the intermediate p-type PANI while holes were left on the lateral n-type PCN involved in the Z-scheme, resulting in the retention of high oxidation–reduction potentials. Moreover, this approach to enhance the photocatalytic activity by constructing a Z-scheme heterojunction and surface polarization could expand to other photosystems, which provides a new avenue for the rational design and the synthesis of novel photocatalysts.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 65
·52809-52816
·
IF 3.84
Hang Luo,Dou Zhang,Lu Wang,Chao Chen,Jing Zhou,Kechao Zhou
A sandwich-structured composite consisted of a pure poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) central layer and two BaTiO3–P(VDF-HFP) neighboring layers was developed for high energy storage density. The sandwiched structure effectively enhanced dielectric properties and energy storage capacity of the composites. Breakdown strength and energy storage density of the composite with 35 vol% P(VDF-HFP) central layer reached 315 kV mm−1 and 5.22 J cm−3, which were enhanced by 68% and 125% compared to 187 kV mm−1 and 2.32 J cm−3 of the single layer composite, respectively. The dielectric constant of the composites with sandwich-structure was approximately 3 times higher than the pure P(VDF-HFP) and the dielectric loss was as low as 0.026 at 1 kHz. These results demonstrated that the sandwich-structured ceramics/polymer composite was an effective way to produce high energy density composites.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 40
·21650-21658
·
IF 14.511
Yu Cheng,Zhongbin Pan,Hanxi Chen,Xiangping Ding,Zhicheng Li,Xu Fan,Jinjun Liu,Peng Li,Jinhong Yu,Jiwei Zhai
High-performance flexible dielectric capacitors have a decisive effect in advanced electronics and electrical power systems. Nevertheless, the discharge energy density (Ud) of dielectric capacitors is bounded by their weak breakdown strength (Eb) and low dielectric constant (K). In this work, mediate dielectric constant one-dimensional hydroxyapatite nanowires (HAP NWs) were synthesized and applied in poly(vinylidene fluoride-co-hexafluoropropene)-based (P(VDF–HFP)) nanocomposites for energy storage application. To mitigate electric field distortion and suppress free charge migration in nanocomposites, Al2O3 was insulated as an interfacial layer incorporated between 1D HAP NWs and polymer matrices, which were identified via phase field simulations and experimental results. Accordingly, P(VDF–HFP)/HAP@Al2O3 NWs composite films exhibit an excellent Ud of ∼27.6 J cm−3 accompanied by a high charging/discharging efficiency (η) of ∼72.9% at 650 MV m−1, which is ∼190% over neat P(VDF–HFP) (∼9.5 J cm−3 at 500 MV m−1) and ∼2200% improvements of bench-mark biaxially oriented polypropylene (∼1.2 J cm−3 at 650 MV m−1). This research offers a paradigmatic design to polymer-based composite films with high Ud and η for application in dielectric capacitors.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 34
·期 3
·600-608
·
IF 2.007
Cui Yanhua,Meng Minjia,Sun Dongshu,Liu Yan,Pan Jianming,Dai Xiaohui,Yan Yongsheng
We developed a simple phase inversion technique to prepare molecularly imprinted membrane (MIM) at room temperature for membrane selective adsorption and separation of methyl p -hydroxybenzoate (M4HB). The prepared SMIP-MIM was characterized by SEM, FT-IR, TGA. Compared with non-imprinted membrane (NIM 1-5 ) adsorbent, SMIP-MIM 1-5 adsorbent with high specific surface area and showed higher binding capacity, faster kinetic and better selectively adsorption capacity for M4HB. The maximum isotherm adsorption capacity for M4HB of SMIP-MIM 4 was 3.519mg·g −1 , and the experimental data was well fitted to the slips model by multiple analysis. The maximum kinetic adsorption capacity and equilibrium adsorption time for SMIP-MIM 4 were 1.335mg·g −1 and 160 min, respectively. The mechanism for dynamic adsorption of M4HB onto SMIP-MIM 4 was found to follow pseudo-first-order model and pseudo-second-order model. Additionally, the permeability separation factor of SMIP-MIM 4 for M4HB compared to a structural analogues methyl 2-hydroxybenzoate (M2HB) could reach 2.847. The adsorption capacity of SMIP-MIM 4 for M4HB and M2HB was 0.549mg·cm −2 and 1.563mg·cm −2 , respectively. The adsorption behavior of M4HB through SMIP-MIM 4 followed the retarded permeation mechanism.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chenhui Yao,Yongqing Zhang,Meimei Du,Xiaodong Du,Shaobin Huang
Persistent organic pollutants (POPs) are widely distributed and have significant negative environmental impacts. Advanced oxidation processes (AOPs) based on sulfate radicals produced from persulfate (PS) have attracted considerable attention for the degradation of POPs, however, there are several disadvantages with these radical activation systems. This study examined the degradation of p -chloroaniline (PCA) by persulfate (PS) activated with activated carbon (AC). The effects of initial pH and dosage of AC were also investigated. Results showed that AC exhibits good catalytic activity toward PS. Increasing AC dosage significantly improved the PCA degradation rate but PCA removal was not obviously influenced by initial pH ranging from 3 to 9. PS activation in the PS/AC system was a non-radical process as demonstrated by (i) ethanol and tert -butyl alcohol having little effect on PCA removal and (ii) Electron Paramagnetic Resonance results showing no radicals signals in the PS/AC system. Results also demonstrated that TOC could be removed in PS oxidation and PCA dechlorination was rapid (in the initial 30 min). The three major intermediates identified during the PCA degradation in the non-radical oxidation process were N-(4-chloro-phenyl)-benzene-1,4-diamine, 4-chloro-phenyl-diazene and hydroquinone and two pathways of PCA degradation was proposed. This study proposes a new insights into the mechanism of PS activation by AC and an efficient method for POPs removal.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 50
·31663-31670
·
IF 3.108
Hong Wang,Taotao Jiang,Lei Ma,Hanbing Wang,Xiaoliang Xu,Chunshan Lu,Xiaonian Li
In this study, we found that the phenylhydroxylamine intermediate could desorb more easily from an Ir surface than from a Pt surface, which is beneficial for inhibiting the over-hydrogenation of phenylhydroxylamine to aniline. On the other hand, the Brφnsted acid functionalized ionic liquids with sulfonic acid and bisulfate anions were acidic enough to catalyze the Bamberger rearrangement to form p-aminophenol from phenylhydroxylamine. On this basis, a new catalytic system constructed by Ir/C and Brφnsted acid functionalized ionic liquid was applied, for the first time, to the one-pot hydrogenation of nitrobenzene to p-aminophenol. Our results indicate that the PAP selectivity of Ir/C and [SO3H-bmim][HSO4] Brφnsted functionalized ionic liquid was far more than that of the traditional Pt/C and sulfuric acid catalyst system. Furthermore, the dually functionalized ionic liquid ([HSO3-b-N-Bu3][HSO4]) can be used simultaneously as an acid catalyst and also as a surfactant, due to its higher lipophilicity. Therefore, our new catalytic system has unique advantages in the hydrogenation of nitrobenzene to p-aminophenol.
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高影响因子
Catalysts
·
2019
·Vol. 9
·期 2
·114
·
IF 3.444
Ke Yu,Yan Lin,Jinchen Fan,Qiaoxia Li,Penghui Shi,Qunjie Xu,Yulin Min
Ethanol oxidation reaction (EOR) is an important electrode reaction in ethanol fuel cells. However, there are many problems with commercial ethanol oxidation electrocatalysts today, such as poor durability, poor anti-CO poisoning ability, and low selectivity for C–C bond cleavage. Therefore, it is very meaningful to develop a high-performance EOR catalyst. Herein, we designed ternary N, S, and P-doped hollow carbon spheres (C–N,P,S) from polyphosphazene (PCCP) as Pd supports for EOR. Using SiO2spheres as the templates, the PCCP was first coated on the surfaces of SiO2spheres by in situ polymerization. Through high-temperature pyrolysis and hydrofluoric acid-etching, the hollow PCCP has a large surface area and porous structure. After loading Pd nanoparticles (NPs), the Pd/C–N, P, S catalysts with Pd NPs decorated on the surfaces of C–N, P, S can achieve a high mass peak current density of 1686 mA mgPd−1, which was 2.8 times greater than that of Pd/C. Meanwhile, the Pd/C–N, P, S catalyst also shows a better stability than that of Pd/C after a durability test of 3600s.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6538-6546
·
IF 12.732
Meng Zhang,Lu Wang,Bin Wang,Bo Zhang,Xiuping Sun,Debao Wang,Zhen Kong,Liqiang Xu
Lithium–sulfur batteries have attracted increasing attention in the field of energy storage due to their advantages of high specific energy and energy density. However, there are still many difficulties in the practical application of lithium–sulfur batteries, such as large volume expansion of sulfur and shuttle effect of polysulfides, which led to rapid capacity attenuation and poor cycling performance. To address these problems, herein, nanosized phosphorus-modified Fe4N supported by nitrogen, phosphorus co-doped graphene nanosheets (P-Fe4N@NPG) has been synthesized by a simple solvothermal method combined with subsequent nitriding and phosphating calcination, and then used as a sulfur host for lithium–sulfur batteries. Benefiting from the high electrical conductivity, multiple composition and unique structure, the obtained P-Fe4N@NPG/S cathode exhibits excellent electrochemical performances: the cathode presents a high initial specific capacity of 1386.1 mA h g−1 at 0.1C, distinct cycling performance (417.4 mA h g−1 at 1C after 1000 cycles) and excellent rate performance with a sulfur loading of 73 wt%. Even if the sulfur loading increases as high as 3.52 and 5.65 mg cm−2, the cathode still displays an excellent rate performance and outstanding areal capacity of 6.03 mA h cm−2, respectively. These results indicate that our design of P-Fe4N@NPG is a great development in the application of sulfur hosts for lithium–sulfur batteries.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 27
·13010-13020
·
IF 3.925
Jianke Tang,Yanfeng Xue,Chunlei Ma,Shengjian Zhang,Qiaoling Li
The construction of p–n heterojunctions instead of p-type or n-type semiconductors can improve the separation efficiency of photoinduced electrons and holes. In this work, BiOI/tetrapod-like ZnO whisker (T-ZnOw) p–n heterojunction photocatalysts with different Bi/Zn molar ratios were prepared by the in situ precipitation of BiOI on a T-ZnOw substrate. The BiOI/T-ZnOw photocatalysts efficiently degraded rhodamine B (RhB) and oxytetracycline (OTC) under visible light irradiation. The photocatalyst with a Bi/Zn molar ratio of 1 : 10 (BZ-10) exhibited the highest photocatalytic activity, with 97.1% and 88.0% removal of RhB and OTC, respectively. After degradation cycling experiments, the OTC removal efficiency was still 80.7%. The photocatalytic activity of the BZ-10 composite was improved compared to those of pure T-ZnOw and BiOI. This was attributed to the large specific surface area and the efficient separation of charge carriers caused by the formation of p–n heterojunctions between BiOI and T-ZnOw. The photodegradation mechanism was put forward based on radical trapping experiments and electron spin resonance (ESR) results. The synthesized BiOI/T-ZnOw heterojunction composite could be a promising photocatalyst in environmental photocatalysis.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Limeng Zhang,Yanlong Xia,Zhigang Che,Boxin Jiao,Xu Wang,Jiacheng Shang,Yurong Zhou,Fengzhen Liu
Tin dioxide (SnO2) has emerged as a highly promising candidate for electron transport layers in perovskite solar cells. However, defects in the SnO2 film and at the interface between SnO2 and perovskite often cause serious nonradiative recombination, resulting in the deterioration of the performance of perovskite solar cells. Herein, a synergistic passivation strategy is employed through the introduction of amphiphilic fluorosurfactants (FS-31) into the SnO2 precursor solution, enabling the passivation of defects present both in the SnO2 film and at the interface between SnO2 and perovskite. Moreover, FS-31 is capable of modulating the energy level of the SnO2 film and enhancing the crystalline quality of the wide-band-gap perovskite, thereby minimizing residual lead iodide. Thanks to the positive effects of FS-31, the n–i–p type wide-band-gap perovskite (1.68 eV) solar cells achieve a champion power conversion efficiency (PCE) of 20.92%, an open circuit voltage (VOC) of 1.24 V, and a minimal VOC deficit of 0.44 V. Furthermore, this simple strategy provides strong support for the preparation of high-efficiency n–i–p perovskite/silicon tandem solar cells.
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Huixiang Huo,Xuhua Wei,Chao Peng,Jing Li,Erkang Wang
Optimization of p-d orbital hybridization enhances charge interactions through increased orbital overlap, reduced electron transfer energy barriers, and regulated reaction activation energies, thereby significantly improving the catalytic kinetics. To implement the strategy, atomic substitution of Ru for Fe is employed in parent FeMnCuCoNi high-entropy nanozymes (HEzymes), yielding the RuMnCuCoNi HEzymes variant with outstanding peroxidase-like activity, demonstrating a 7-fold increase in activity over the parent alloy. Mechanistic studies reveal that the Ru 4dyz orbital, as the optimal catalytic site, exhibits stronger hybridization with the pz orbital of H2O2, which significantly enhances substrate adsorption. Concurrently, the reduced electron occupancy in antibonding orbitals strengthens orbital interactions with H2O2 while elevated electron density near the Fermi level accelerates electron transfer. The tripartite synergy, including enhanced adsorption, strengthened orbital interactions, and facilitated electron transfer, collectively drives the catalytic enhancement. Leveraging this nanozyme, an on-site detection platform is constructed for gastric cancer biomarkers (d-proline and d-alanine), achieving exceptional sensitivity and selectivity. Our work underscores the significance of p-d orbital hybridization regulation, providing a rational design principle for high-performance nanozymes.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Han Wang,Xiaolong Tian,Xiaoyi Liu,Jian Cui,Ailin Gao,Yehai Yan
Membrane distillation (MD) technology is crucial for achieving zero discharge of hypersaline wastewater. However, its practical application has been hindered by low permeation flux. This study presents a hydrogel-coated Janus membrane (JM), developed through controlled interfacial free radical polymerization (IFRP) on a self-fabricated hydrophobic polyvinylidene fluoride (PVDF) substrate under ultraviolet irradiation. Microscopic images show that the in-situ synthesized hydrogel infiltrated into the nanoscale pores of the PVDF substrate, forming a stable "physical interlocking" composite structure with an impressive hydrophilic modification depth of 42 μm. MD performance results indicate that the optimized M-P2H4 JMs achieve remarkable water vapor flux of 42.14 L m -2 h -1 , while maintaining stable flux and salt retention across various salt concentrations (3.5wt%-20wt%). Molecular dynamics simulations reveal a strong interaction energy between the synthesized hydrogel layer and water molecules. Dark evaporation tests, differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA) analysis show that the hydrogel networks increase intermediate water proportion and remarkably reduce evaporation enthalpy. Higher specific surface area is measured for the microsphere-based PVDF membrane, thereby increasing the evaporation area. The combination of the reduced evaporation energy barrier and increased evaporation area of M-P2H4 result in its excellent evaporation efficiency, which also presents excellent resistance to surfactant-stabilized oil-in-water brine emulsions. This study offers valuable insights into designing JM with high flux capability and superior anti-fouling properties.
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产品关联
DOI
高影响因子
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