Small
·
2023
·Vol. 19
·期 48
·2303781
·
IF 13.3
Yikun Yi,Feng Hai,Jingyu Guo,Xin Gao,Wenting Chen,Xiaolu Tian,Wei Tang,Weibo Hua,Mingtao Li
The energy density of lithium-sulfurized polyacrylonitrile (Li-SPAN) batteries has chronically suffered from low sulfur content. Although a free-standing electrode can significantly reduce noncapacity mass contribution, the slow bulk reaction kinetics still constrain the electrochemical performance. In this regard, a novel electrochemically active additive, polypyrrole (PPy), is introduced to construct PAN nanotubes as a sulfur carrier. This hollow channel greatly facilitates charge transport within the electrode and increases the sulfur content. Both electrochemical tests and simulations show that the SPANPPy-1% cathode possesses a larger lithium-ion diffusion coefficient and a more homogeneous phase interface than the SPAN cathode. Consequently, significantly improved capabilities and rate properties are achieved, as well as decent exportations under high-sulfur-loading or lean-electrolyte conditions. In-situ and semi-situ characterizations are further performed to demonstrate the nucleation growth of lithium sulfide and the evolution of the electrode surface structure. This type of electrochemically active additive provides a well-supported implementation of high-energy-density Li-S batteries.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 10
·4167-4177
·
IF 1.6
Peng Yinyin,Pan Ting,Chen Chuang,Zhou Mi,Liu Derong,Feng Jian,Xiong Wei,Liu Ning,Yuan Guoyuan
In this work, MOFs materials functionalized (HC-MOFs) with heterocyclic ligands (thiophene-TPC, pyrrole-PCA and furfural-FUR) were prepared by a one-step method and used for cobalt ion separation studies. The results showed that the maximum adsorption of cobalt ions by the three adsorbents was 141.0 mg/g (UiO-66-TPC), 146.0 mg/g (UiO-66-PCA), and 150.6 mg/g (UiO-66-FUR), respectively, at pH 8.3 and a temperature of 298 K. In addition, The HC-MOFs showed good stability under different doses (0 ~ 200 kGy) of γ-ray irradiation and have great potential for application in the separation of practical radioactive wastewater containing 60 Co.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Ching-Wen Lou,Mengdan Wei,Jiaxin Li,Ting-Ting Li,Bing-Chiuan Shiu,Jia-Horng Lin
Bioelectric signals are an important factor that maintain cell functions and affect cell behavior. Conductive polymers (CPs) can facilitate cell activity and reinforce the signal transmission among cells, so CPs have triggered attention to the tissue regeneration. In this study, layer-by-layer strategy is employed and polyvinyl alcohol (PVA)/polylactic acid (PLA) braids are polymerized in polypyrrole (PPy) by ice template method. The stents that are deposited with PPy are then immersed in dopamine solution, which during polydopamine (PDA) is coated over the stents naturally. Finally, PDA is used as a template to form hydroxyapatite (HA) coating layer with the aim of electrochemical deposition . The test results indicate that PPy forms an even conductive network over the surface of braids while the electrochemically deposited HA made with PDA is adsorbed over the scaffolds in a needle pattern. According to the cyclic voltammetry measurement, the CV curves of HA/PDA/PPy scaffolds basically retain specified and thus the scaffolds possess stabilized electrochemical activity. At last, HA/PDA/PPy scaffolds are immersed in a simulated body fluid (SBF) for ten days and the surface is completely wrapped in HA, indicating an excellent biomineralization capability. MTT assay results suggest that the cell viability of composite scaffolds is improved by 188 %. This study provides a new perspective, a layer-by-layer structured bone scaffolds, broadening the application range of textile structure in the bone tissue engineering field.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Man Zheng,Jiaxian Liu,Kun Shi,Yuxin Zhao,Tong Zhang,Fangxun Liu,Yidan Chen,Yuena Sun,Yufan Zhang,Huan Wang
In this study, we successfully prepared CH-CNT@Fe-Co-Pt x by combining chiral helical nanostructure , high conductivity, high electro-catalytic activity of iron-cobalt transition metals and precious platinum. The material used C 18 - L -Clu as the soft template, polypyrrole as the carbon source and nitrogen source. The precursor cobalt iron ions were then loaded onto the chiral amino acid template. Using the displacement reaction, a spot of platinum metal was successfully introduced into the composite to obtain CH-CNT@Fe-Co-Pt x composite material. According to the reaction mechanism steps of OER/ORR in alkaline solution, Fe-Co-Pt as the active site adsorbed OH - in OER and adsorbed H 2 O molecules in ORR. The tafer slope of OER and ORR for catalyst CH-CNT@Fe-Co-Pt 2 reached 35.0 mV dec −1 and 60.8 mV dec −1 , respectively. And the current density of H-CNT@Fe-Co-Pt 2 retained 84% and 91.5 % respectively after a long time i-t test. Moreover, the number of transferred electrons of CH-CNT@Fe-Co-Pt 2 in the ORR reaction reaches 3.90. This work provides new ideas for the research of chiral carbon nanomaterials in the field of electro-catalytic energy, and provides a new method for the development of efficient and low-cost energy electro-catalysts.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Zhengdong Ma,Yehua Shen,Xiaoheng He,Hua Fan,Wenbo Wang,Qiuhong Bai
Renewable biomass-derived carbon materials are beneficial for the sustainable development of energy. Herein, we propose a strategy to fabricate nitrogen-doped tubular porous carbon (PPy@JEC) by depositing Polypyrrole (PPy) on the surface of Juncus effusus (JE) microtubes and then carbonizing and activating with KOH. Changing the activation temperature and dosage of the activator could effectively regulate the pore structure of PPy@JEC. Such tubular porous carbon retains JE's natural microtubule structure for improving electrolyte ions transfer efficiency. The optimal carbon materials exhibited a high specific surface area (1955 m 2 g −1 ), good electrochemical performance (326 F g −1 at 0.5 A g −1 ), and the capacitance retention reached 66 % at 20 A g −1 . The symmetric supercapacitor constructed using the optimal PPy@JEC exhibits an energy density of 15 Wh kg −1 . The capacitance retention rate can remain 90.9 % after 15,000 cycles at 5 A g −1 . This work demonstrates that PPy@JEC can be a potential candidate for low-cost and sustainable supercapacitor electrode materials.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Qing Yang,Jun Wang,Jie Luo,Shuai Tan,Cai Hong Wang,Yong Wu
Constructing elastic electrodes with high mechanical and electrochemical stability remains a challenge in developing flexible supercapacitors. Instability of elastic composite electrodes stems from detachment of noncovalently associated electroactive components from elastic substrates under cyclic deformations. Herein, a novel all-organic copolymer consisting of polypyrrole grafted from a polyacrylate elastomer is proposed as elastic electrodes for stretchable supercapacitors. The single copolymer is obtained by graft polymerization in the swollen state, characterized by a wrinkled polypyrrole coating covalently attached on an elastic core. The copolymer is intrinsically elastic and maintains structural integrity under bending, twisting, and stretching deformations to ensure stable electrochemical performance. In addition, the grafted polypyrrole aggregates densely under the constraint of the backbone and gives a competitive conductivity of 41.6 S cm–1. A stretchable supercapacitor is constructed using the copolymer as electrodes and an acid hydrogel as an electrolyte, resulting in a specific capacitance of 430 mF cm–2. The supercapacitor delivers a capacitance retention of 100% after 1000 stretching–releasing cycles, exhibiting mechanical and electrochemical reliability under elastic deformations.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 19
·1-13
·
IF 2.8
Lan Mingyang,Fan Zhanhui,Yang Chao,Qiu Jianhui,Zang Limin
Flexible energy storage devices have been applied more and more in recent years, such as wearable electronic products, folding mobile phones, and so on. In this study, through the use of waste face mask (WFM) unique three-layer structure, designed a zinc-ion hybrid capacitor (ZHC), the outer layer of WFM through the vapor phase polymerization method on the surface of WFM uniformly covered with a layer of polypyrrole (PPy), to enhance the conductivity of the material and improve the surface topography. The loading of PPy is then increased by electrodeposition and dopants are introduced to further improve its electrochemical properties. It improves the problem that the conductivity of the active material becomes poor with increasing polymerization time and cannot continue to grow so that the electrochemical and mechanical properties of the electrode can be effectively strengthened. The other pole also through the way of electrodeposition on the surface of Zn deposition. ZHC is assembled using ZnSO 4 /gelatin as the electrolyte and WFM inner layer as the separator. The assembled ZHC has excellent electrochemical performance, with a mass-specific capacity of 121.5 mAh g −1 at 0.1 A g −1 and an energy density of 97.6 Wh kg −1 at 0.1 A g −1 . In addition, the capacity retention rate remains 77.1% after 10,000 charge-discharge cycles. The assembled ZHC allows a small fan or digital watch to function properly. These results indicate that the prepared ZHC can be widely used in reality.
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MOLECULES
·
2023
·Vol. 28
·期 14
·5296
·
IF 4.6
Zhenjiang Lu,Wenjin Qin,Juan Ma,Yali Cao,Shujuan Bao
Direct formic acid fuel cells (DFAFCs) are one of the most promising power sources due to its high conversion efficiency; relatively low carbon emissions, toxicity, and flammability; convenience; and low-cost storage and transportation. However, the key challenge to large-scale commercial applications is its poor power performance and the catalyst’s high preparation cost. In this study, a new sandwich-structured Pd/polypyrrole-graphene/Pd (Pd/PPy-Gns/Pd)-modified glassy carbon electrode (GCE) was prepared using a simple constant potential (CP) electrodeposition technique. On the basis of the unique synthetic procedure and structural advantages, the Pd/PPy-Gns/Pd shows a fast charge/mass transport rate, high electrocatalytic activity, and great stability for formic acid electro-oxidation (FAO). The mass activity of Pd/PPy-Gns/Pd electrode reaches 917 mA·mg−1Pd. The excellent catalytic activity is mainly due to the uniform embedding of Pd nanoparticles on the polypyrrole-graphene (PPy-Gns) support, which exposes more active sites, and prevents the shedding and inactivation of Pd nanoparticles. At the same time, the introduction of graphene (Gns) in the PPy further improved the conductivity of the catalyst and accelerated the transfer of electrons.Keywords:electrodeposition;polypyrrole;Pd nanoparticles;DFAFCs
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Energies
·
2023
·Vol. 16
·期 13
·5112
·
IF 3.2
Jinlin Liu,Yu Wang,Zilong Zhong,Zhou Zhou,Dongliang Chen,Weijie Wang,Shuaixing Mai
Air-conditioning systems account for 40–60% of the energy consumption of buildings, and most of this figure corresponds to the cooling and dehumidification process of air-conditioning units. Compared with traditional compressed air-conditioning systems, solid adsorption dehumidification systems possess good potential to improve indoor air quality and reduce buildings’ energy consumption. However, there are still some problems that prevent the use of solid adsorption dehumidification systems, such as their complexity and high regeneration temperatures. The key to solving the above problem is the discovery of more suitable adsorbents. In this paper, poly N-isopropylacrylamide/polypyrrole (PNIPAm/PPy) hydrogel was selected as the research object, and the performance of the dehumidification material and its potential for application in solid dehumidification systems were studied. It was found that the pore structure of PNIPAm/PPy was relatively complex and that there were abundant pores with uneven pore sizes. The minimum pore size was about 4 μm, while the maximum pore size was about 25 μm, and the pore sizes were mostly distributed between 8 and 20 μm. Abundant and dense pores ensure good hygroscopic and water-releasing properties of the resulting hydrogel. The PPy inside the hydrogel acts as both a hygroscopic and photothermal agent. In an environment with a relative humidity of 90%, 60%, and 50%, the hygroscopic efficiency of PNIPAm/PPy reached 80% in about 75, 100, and 120 min, and the corresponding unit equilibrium hygroscopic capacity values were 3.85 g/g, 3.72 g/g, and 3.71 g/g, respectively. In the initial stage, the moisture absorption increased with the increase in time; then, the increase in moisture absorption decreased. When the temperature was below 40 °C, the hygroscopic performance of PNIPAm/PPy was almost temperature-independent. The PNIPAm/PPy with different thicknesses showed similar moisture absorption efficiency. The lowest desorption temperature of PNIPAm/PPy was 40 °C, which indicates that low-grade energy can be used for material desorption. And the higher the temperature, the faster the desorption rate of PNIPAm/PPy and the higher the desorption amount. It can be seen that the PNIPAm/PPy hydrogel presents good desorption performance and can be used repeatedly.Keywords:heat and mass transfer in porous media;dehumidification material;hydrogel;solid dehumidification system;hygroscopic efficiency;desorption performance
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Polymers
·
2023
·Vol. 15
·期 13
·2918
·
IF 5
Cheng Tang,Tao Hu,Chengzhen Du,Ziqin Liao,Wenyan Cheng,Fen Wang,Xiaoli Hu,Kunpeng Song
A Fe-N conjugated organic polymer (SMP-Fr-Py) was prepared from ferrocene and pyrrole using a Scholl coupling reaction, which significantly improved the performance of Cr(VI) removal compared to the polymer (HCP-Fr-Py) prepared by adding the cross-linker formaldehyde dimethyl acetal (FDA). The results showed that at a pH of 2 and at 25 °C, the removal of Cr(VI) reached 90% for SMP-Fr-Py and only 58% for HCP-Fr-Py after 20 min of reaction. Subsequently, 99% and 78% were achieved after 120 min of reaction, respectively. The test results showed that the removal reaction followed a pseudo-second-order kinetic model. The removal efficiency decreased with increasing solution pH and initial Cr(VI) concentration, but increased with increasing SMP-Fr-Py dosage, reaching three cycles. The characterization of the reaction complexes and measurements of Cr species conversion revealed the near absence of Cr(VI) species in the solution. Approximately 38% of Cr(VI) was found to be adsorbed on the material surface, with another fraction present in solution (24%) and on the material surface (38%) in the form of Cr(III). The overall study showed that the direct connection of ferrocene and pyrrole in SMP-Fr-Py through C-C bonding increased the conjugated structure of the polymer backbone, which facilitated electron transfer and transport. Furthermore, the Fe-N elements worked synergistically with each other more easily, which improved the removal performance of Cr(VI) and provided a reference for the subsequent work.Keywords:organic polymers;Fe-N co-doping;Cr(VI) removal;conjugate structure
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Feiyan Wang,Linhong Liao,Xiaohui Liu,Jie Zhang,Fengshou Wu
Glucose is regarded as a clinical biomarker, and the abnormal level of glucose in blood would cause endocrine metabolic diseases. Thus, it is of great significance to develop a simple, accurate, and sensitive method for glucose detection. In this work, we synthesized an iron porphyrin-based porous organic framework (Fe-POF) through a facile alkylation reaction between 5,10,15,20-tetra(4-aminophenyl) porphyrin (TAPP) and cyanuric chloride. Fe-POF exhibited excellent peroxidase-like activity and could be used to detect hydrogen peroxide and the molecules associated with hydrogen peroxide such as glucose. The structure of Fe-POF was confirmed through a series of methods, such as FT-IR, SEM, EDS, TEM, and XPS. Fe-POF exhibited excellent peroxidase-like activity, which could catalyze the oxidization of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into blue product (ox-TMB) in the presence of hydrogen peroxide (H 2 O 2 ). Based on this phenomenon, a simple colorimetric assay was constructed for the detection of H 2 O 2 and glucose with high selectivity and sensitivity. The detection limit of H 2 O 2 and glucose was calculated to be 1.8 and 1.39 μM, respectively. Finally, Fe-POF was applied as a colorimetric sensor for rapid detection of glucose in diluted serum samples.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Jia Xu,Zhaomin Chen,Jiwei Jiang,Bo Song,Hui Zhang,Bin Dong
Freshwater crisis is a global problem and seeking more sources of fresh water is the key to solving this problem. Solar water purification and fog collection are two separate ways to obtain fresh water. However, neither of these methods could operate 24/7 when used alone. Herein, we report a hydrogel membrane that can achieve both solar water purification and fog collection, thus enabling all-day freshwater collection. The hydrogel membrane with microstructured patterns inspired by the structure on the back of the Namib Desert beetle consists of poly(vinyl alcohol) (PVA), chlorine-reinforced polypyrrole (PPy-Cl), and silicon dioxide nanoparticles (SiO2NPs), which is capable of harvesting up to 25 L of fresh water per square meter per day under the outdoor conditions. The excellent freshwater collection capacity is realized based on the synergetic interaction among the hydrophilicity of PVA, the photothermal conversion capacity of PPy-Cl, and the biomimetic microstructures. Furthermore, due to the improved mechanical properties brought by SiO2NPs, the hydrogel-based evaporator reported in the current study has better water resistance as well as mechanical properties, which allows it to be used outdoors for long periods of time and facilitates its practical application.
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