Materials Today Communications
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2023
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IF 3.8
Qinghu Meng,Lu Yu,Xue Yang,Rui Gao,Hejia Chang,Yue Wu,Zhizhou Yang,Anhou Xu,Sheng Gao,Fang Liu
In this manuscript, a series of functionalized PS microsphere (FPS), FPS@polyaniline (FPS@PANI) composite, hollow polyaniline sphere (HPANis), hypercross-linked hybrid polyanilines (HHPs) were prepared. The resulting polymers were well characterized. The results indicated that FPS was a uniform and well-defined sphere with rough and reticulate surface. The diameter of FPS was about 250 nm. FPS@PANI composite possessed well-defined spherical appearance, and its size was about 300～500 nm. The resultant HHP-1, HHP-2, and HHP-3 displayed higher specific surfaces of 153, 274 and 342 m 2 g —1 , respectively. They are mainly composed of micropores and mesopores. The adsorption experiments revealed that the computed maximum adsorbed quantities of malachite green (MG) and rhodamine B (RhB) for HHP-3 were 495.04 and 826.44 mg g —1 at 298 K and pH= 4, respectively, which were higher than many developed adsorbents. The regeneration experiments exhibited that after four cycles’ regeneration, the reusability performances of MG and RhB were still up to 92.19% and 88.05% respectively, suggesting that HHP-3 possessed wide prospect to be a promising adsorbent for dye waste water treatment and ecological environment restoration.
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COMPOSITES COMMUNICATIONS
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2023
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IF 8
Yaqin Wang,Congrui Bai,He Shi,Yingying Xu,Xiaoming Wang,Zhaoyang Fan,Huan Jiao
Carbon nanotube yarn is a potential substance for the fabrication of fiber-shaped energy storage devices owing to its lightweight, stiffness, and excellent electrical properties. However, it has a compact structure with a limited pore volume , leading to insufficient active material loading and inadequate gel electrolyte penetration. These seriously restrict its application in fiber-shaped energy storage devices made entirely of solid-state components. Herein, glycerol-functionalized polyacrylonitrile nanofibers (GPN) are electro-spun and collected on Ti wire. And they are chosen as hydrophilic support to load carboxylic multiwalled carbon nanotubes (CMWCNTs) via dip-coating. After oxidation , a 3D rolled O-CMWCNTs@GPN/Ti aerogel fiber-shaped structure with macroscopic thickness and excellent stability in water is fabricated. The O-CMWCNTs@GPN/Ti structure has a high length-specific capacitance value of 15.2 mF cm −1 itself. It also can be used as a current collector to load pseudocapacitive materials to improve capacity. With polyaniline (PANI) electrodeposited in this structure, the as-prepared hybrid aerogel electrode PANI@O-CMWCNTs@GPN/Ti displays a high specific capacitance of 52.6 mF cm −1 in a fiber-shaped supercapacitor device. All features suggest that O-CMWCNTs@GPN/Ti aerogel is an excellent candidate for flexible fiber-shaped energy storage devices.
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ELECTROCHEMISTRY COMMUNICATIONS
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2023
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IF 5.4
Jiao-ling Hong,Jia-hua Liu,Xinbo Xiong,Si-yin Qin,Xiao-ying Xu,Xiao Meng,Kunming Gu,Jiaoning Tang,Da-Zhu Chen
The work temperatures have a crucial influence on the performance of supercapacitors. However, temperature effects on pseudocapacitive behaviors are rarely studied for flexible high-performance fiber supercapacitors. Herein, we systematically investigated the electrochemical responses of all-solid-state fiber-based supercapacitors composed of carbon nanotube fiber (CNF) electrodes decorated with porous carbon nanotubes (CNTs)/polyaniline (PANI) and gel electrolyte at various ambient temperatures between −5 °C and 55 °C. The results show that the capacitance of the supercapacitor first enhances with the rising temperature under 40 °C and declines at 55 °C. The internal resistance presents a gradual downward trend and the self-discharge behavior accelerates at high operating temperatures. CNTs/PANI-modified flexible fiber supercapacitors are also far from unsatisfactory for cycling stability tests in a high-temperature environment. After experiencing 5000 charge–discharge cycles at 55 °C, the capacitance retains only 43.86 %, far below the counterpart at low temperatures. This study provides a fundamental comprehension of the temperature dependence of pseudocapacitive behaviors of PANI-based fiber supercapacitors.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 10
·3513-3520
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IF 6.4
Guangyang Bao,Wenyuan Yu,Qianqian Fu,Jianping Ge
An electrically responsive photonic crystal (ERPC) in weak polar media showed good performance due to less screening of Coulombic interaction, but its synthesis was a challenge because of the difficulty in fixing the amount of charge-controlling agent and water. Here, an SiO2/aniline (ANI) weak-polar EPRC was fabricated by a simple process without using any charge-controlling agent. As an alkaline weak polar solvent, aniline not only helps to disperse the particles in solution but also renders a particle with high surface charge by taking a proton away from the silanol group, both of which favor the formation of an ERPC in a weak polar system. Compared to reported ERPCs, the SiO2/ANI ERPC possessed a broad reflection wavelength tuning range (230 nm) under a low working potential (1.4 V) due to less screening of Coulombic interaction. The low working potential further relieved the decrease in color intensity under large lattice compression and improved the long-term stability and reversibility of the reflection signals in electrical tuning.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yun Guo,Wenjie Zhao,Shuyu Dai,Jian Mao,Qidong Zhang,Zhengkun Xie,Wenfen Zhang,Wuduo Zhao,Ajuan Yu,Shusheng Zhang
Herein, a highly stable (NAllyl) 4 -bridged alyzacalix[4]pyridine monolithic column (nAC4P@capillary) was fabricated by copolymerizing nAC4P with GMA and EDMA into a stationary phase through a simple olefin addition reaction. The physicochemical properties of the prepared materials were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), energy dispersive X-ray (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and elemental analysis (EA). A wide range of analytes with various properties was well separated and demonstrated the synergistic effect of the various interaction sites. The maximum column efficiencies (N max ) for all the analytes reached 62,368 plates/m, and the relative standard deviations (RSDs) of the daily retention times of alkylbenzenes, measured over six months were all lower than 5.63%. Non-covalent interaction analysis reveals that nAC4P@capillary can effectively combine the advantages of electronic configurations, π-π interactions, CH-π interactions, O–H…N hydrogen bonds and lone pair-π interactions, providing excellent prospects for high-performance chromatographic separation .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiajing Tang,Yinglong Zhang,Wei Fang,Yi Man,Jinzheng Zhang,Qing Zhao,Xiaoyu Lei,Jieqiong Chen,Jidong Li,Yubao Li,Yi Zuo
Inspired by the endogenous electric field of natural bone tissue, fibrous aniline trimer (AT)-based polyurethane (FPAT) membranes have been fabricated with good electroactivity through electrospinning, which may serve to restore electrophysiological microenvironment and regulate site-specific cell behaviors to promote osteogenesis. By virtue of the redox activity, the electroactive FPAT membranes exhibited the progressive scavenging ability of reactive oxygen species (ROS) with increasing AT content. Furthermore, a systematic study of specific biomarkers was practiced to draw a comprehensive understanding of the bioelectrical stimulation, including in vitro cell experiments, in vivo RNA-sequencing, subcutaneous implantation, and bone defect repair. Focused on site-specific cell behaviors, both macrophages and mesenchymal stem cells (MSCs)were significantly regulated by the AT-based membranes on electrophysiological microenvironment. For macrophages, the AT-based membranes polarized macrophages to M2 phenotype by efficiently clearing excessive ROS to manipulate the osteoimmune microenvironment in vitro and in vivo . For MSCs, the FPAT membranes scavenged excessive intracellular ROS and elevated intracellular Ca 2+ concentration, thereby promoting cell proliferation and driving osteogenesis differentiation. Histology results and gene expression profiles on a rat calvarial bone defect model discovered the efficacy of the AT-based membranes in immunomodulation and osteogenesis. Moreover, the upregulated genes at the RNA level and signaling pathways testified that the electroactive FPAT membranes were strongly involved in regulating macrophage polarization and bone repairing process. This work demonstrated an efficacious therapy of electroactive FPAT membranes from the regulatory mechanism, cellular to tissue levels in bone progressive regeneration, which could provide a legible evaluation system for conductive materials.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Sainan Wang,Chao Yuan,Wei Chen,Yifan Niu,Yexi Yan,Fan Li,Hongmei Jiang
A series of CuO@g-C 3 N 4 composites with different contents of g-C 3 N 4 and different morphologies of CuO have been designed and prepared by hydrothermal method and applied to activate peroxymonosulfate (PMS) for the removal 2,4,6-trichlorophenol (2,4,6-TCP). The results showed that 3D spherical shape CuO-1@g-C 3 N 4 -3, being able to activate PMS to produce a large amount of singlet oxygen ( 1 O 2 ), not only had good catalytic performance, but also reduced the dissolution of Cu 2+ . By comparing the morphological characteristics, catalytic performance, free radical species, decomposition rate of PMS and surface properties of three kinds of CuO, the generation mechanism of 1 O 2 and key reasons of CuO for producing 1 O 2 were deeply explored and finally deduced. Besides, under the conditions of initial pH 7.0, catalyst dosage 50 mg·L −1 , PMS dosage 0.3 mmol·L −1 and initial concentration of 2,4,6-TCP 10 mg·L −1 , the removal rate of 2,4,6,-TCP reached 94 % at 25 min in the first cycle, and 85 % in the fifth cycle. When CuO-1@g-C 3 N 4 was applied in actual water samples, 65 % of 2,4,6-TCP was removed in the Yangtze River, and 60 % of 2,4,6-TCP in Xuanwu and Yueya Lake in 40 min. Quenching experiments and electron paramagnetic resonance (EPR) were used to indentify active species during degradation process and the degradation intermediates of 2,4,6-TCP and possible degradation pathways were determined and proposed by high performance liquid chromatography-time of flight-mass spectrometry (HPLC-TOF-MS 2 ). This study shed light on the 1 O 2 generation mechanism of catalyst and provided theoretical basis and guidance for the design of 1 O 2 catalysts rich in non-radical active species.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Shuang Liu,Hong Wu,Huaili Zheng,Weizhen Zhang,Wei Ding,Hong Li,Chao Liu
Sulfite (S(IV))-based advanced oxidation process has attracted widespread attention due to the generation of strongly oxidizing sulfate radicals (SO 4 •− ) and hydroxyl radicals (HO • ) for contaminants remediation. However, the contaminant degradation by singlet oxygen ( 1 O 2 ) through a nonradical pathway was still unclear in the S(IV) activation system. Herein, a magnetic Fe 3 O 4 /g-C 3 N 4 (MCN) composite was synthesized for the utilization as a visible-light catalyst to activate S(IV) under visible-LED (Vis-LED) for the organic degradation . The incorporation of Fe 3 O 4 in g-C 3 N 4 up-regulated the photocatalytic performance in the S(IV) activation for X-3B degradation, and > 98% of X-3B (20 mg L −1 ) was degraded with the degradation rate constant ( k obs ) of 0.110 min −1 within 30 min. The SO 4 •− and 1 O 2 produced in the MCN/S(IV)/Vis-LED system were identified as the primary reactive species through the quenching experiments and electron spin resonance. Interestingly, the light-induced generation of superoxide radical (O 2 •− ) played a negligible role in the formation of 1 O 2 , and most of 1 O 2 was corroborated to be originated from SO 4 •− besides SO 5 •− , which was rarely reported in other S(IV) activation processes. The catalysts before and after utilization were characterized to further elucidate the mechanisms for the S(IV) activation. There were two possible pathways for the S(IV) activation: the electron transfer from S(IV) to the photo-generated holes and the ligand-to-metal charge-transfer (LMCT) within the surface Fe(III)−S(IV) complexes. Furthermore, the MCN/S(IV)/Vis-LED system was of high resistance to complex water matrixes (pH, inorganic anions, etc.), demonstrating its application perspective in the purification of wastewater containing organic pollutants .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yong Liu,Junyu Yuan,Yuqi Wang,Rongzong Zheng,Qibin Liu,Xiaojuan Shang,Jiaojing Shao,Zhongquan Wan,Junsheng Luo,Chunyang Jia
Electrochromic materials (ECMs) are capable of reversibly adjusting their transmittance or reflectance properties in response to changes in the external biasing voltages. In this study, we enhanced the electrochromic and electrochemical properties of polyaniline (PANi) effectively through the incorporation of MXene Ti2CTx using an in situ composite strategy. This improvement in the electrochromic and electrochemical properties observed can be attributed to the intermolecular forces between the aniline group of PANi and the terminal groups of MXene Ti2CTx sheets. The presence of hydrogen bonds between the PANi monomers and the MXene sheets was confirmed through theoretical calculations and photoluminescence results, which effectively improved the composite interfaces. Additionally, the PANi@MXene composite films were successfully prepared through a simple one-step in situ polymerization process, as verified by SEM and XPS characterization. The electrochemical studies revealed enhanced electronic conductivity, a high ion diffusion coefficient, and a narrow energy redox gap, all contributing to the excellent electrochemical properties observed. Overall, our results demonstrate that the MXene Ti2CTx composition effectively enhances the electrochromic performance of PANi. The PANi@MXene composite films exhibited a high optical modulation range, rapid switching response time, good thermal radiation regulation, and excellent operational stability. This composite strategy significantly improves the performance and practical applicability of ECMs.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 5
·2655-2665
·
IF 1.8
Wang Ziwei,Chen Ying,Liao Fang
In this study, MoS 2 /Cu 2 S/PANI with ‘wheat ear' structure was synthesized on nickel foam (NF) for electrocatalytic hydrogen production. The experimental results show that the catalyst exhibits excellent HER performance. At a current density of 10 mA cm −2 , it only has an overpotential of 98 mV. And it has good durability within 24 h. Compared with other materials, MoS 2 /Cu 2 S/PANI has better catalytic performance. There are three reasons for the enhancement of catalytic activity. On the one hand, polyaniline (PANI) has strong conductivity, which can improve the poor conductivity of MoS 2 . On the other hand, the nitrogen species derived from the PANI structural unit tend to bind metal ions such as Cu 2+ . Make the active material more evenly dispersed on the substrate. Cu 2+ further attracted negatively charged molybdate (MoO 4 2− ) to distribute uniformly on the surface of PANI. As a result, the synthesized molybdenum disulfide (MoS 2 ) is not stacked together, the specific surface area becomes larger, and the active sites increase. In addition, Cu 2 S, as a strong chemical bond between PANI and MoS 2 , should act as an electron transfer channel in the HER process. All of these make the composites exhibit excellent HER performance and thermal stability. Graphical abstract Synthesis mechanism of MoS 2 /Cu 2 S/PANI on nickel foam
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Science Bulletin
·
2023
·
IF 18.9
Chunlin Xie,Shengfang Liu,Hao Wu,Qi Zhang,Chao Hu,Zefang Yang,Huanhuan Li,Yougen Tang,Haiyan Wang
The development of electrolytes with a wide temperature range, no dendrite growth and corrosion resistance is essential for the practical application of aqueous zinc metal batteries . Herein, γ-valerolactone is developed as the co-solvent to extend the operating temperature range of the aqueous electrolyte and stabilize the zinc metal anode interface. This weak solvent acts as a strong hydrogen bonding ligand and “diluent” to break the hydrogen bonds between free water molecules, thus enhancing the temperature tolerance and chemical stability of the electrolyte. The γ-valerolactone can also be adsorbed on the anode surface to achieve a dendrite-free zinc deposition behavior by promoting zinc nucleation and regulating zinc growth texture. The optimized electrolyte enables the symmetric cell to deliver a cycle/rest life of 2160 h and operate stably over a wide temperature range of −50 to 80 °C. The corresponding Zn||AC and Zn||PANI cells exhibit capacity retention of 92.5% and 85% after 8100 and 1600 cycles, respectively. This mechanism of weak solvent-regulated hydrogen bonding and solvent sheath provides new insights into the design of advanced aqueous electrolytes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Lei Zhong,Wenhao Pan,Zhikai Shi,Chengwei Mao,Jiayao Peng,Jianlin Huang
Hollow nitrogen-doped porous carbon spheres (HNCS) with plentiful coordination N sites, high surface area, and superior electrical conductivity are ideal catalyst supports due to their easily access of reactants to active sites and excellent stability. To date, nevertheless, little has been reported on HNCS as supports to metal-single-atomic sites for CO 2 reduction (CO 2 R). Here we report our findings in preparation of nickel-single-atom catalysts anchored on HNCS (Ni SAC@HNCS) for highly efficient CO 2 R. The obtained Ni SAC@HNCS catalyst exhibits excellent activity and selectivity for the electrocatalytic CO 2 -to-CO conversion, achieving a Faradaic efficiency (FE) of 95.2% and a partial current density of 20.2 mA cm −2 . When applied to a flow cell, the Ni SAC@HNCS delivers above 95% FE CO over a wide potential range and a peak FE CO of 99%. Further, there is no obvious degradation in FE CO and the current for CO production during continuous electrocatalysis of 9 h, suggesting good stability of Ni SAC@HNCS.
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