JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2015
·Vol. 30
·期 5
·1085-1091
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IF 0.399
Li Jiajia,Wang Qizhao,Bai Yan,Jia Yongming,Shang Pan,Huang Haohao,Wang Fangping
Polyaniline (PANI) was one of the most extensively studied adsorbents due to its low cost and good environmental stability. The objective of the current study was to improve the selective capabilities of PANI for anionic dyes. We found that the acid doped PANI prepared with hydrochloric acid and p-toluenesulfonic acid (PTSA) could selectively adsorb anionic dyes. It exhibited very good selectivity for OG dye, the mechanism was proposed based on the chemical interaction of PANI with the sulfonate group of the dyes. The effects of solution pH, initial dye concentration, and different HCl/PTSA mole ratios on the adsorption capacity of OG have been investigated. Kinetic simulations indicated that the adsorption process could be well represented by pseudo-second-order kinetic plots. The isothermal adsorption curve fitting also showed that the adsorption process could be well described by the Langmuir isothermal equation. The results showed that acid doped PANI could be employed as a promising adsorbent for anion removal from dye wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Caihong Lv,Xin Zhou,Cheng Chen,Xinghai Liu,Jun Qian
Ammonia serves as a crucial indicator of food spoilage, but current sensors lack sufficient sensitivity, stability, selectivity, and automation for practical on-site and real-time monitoring. A highly sensitive and flexible ammonia sensor based on PEDOT:PSS doped with Lewis acid (FeCl 3 solution) for wireless food monitoring is proposed in this study to solve the above limitations. The intercalation effect caused by the diffusion of Fe 3+ and hydrolyzed H + in the film coordinating with SO 3 − groups present in PSS chains leads to an increased distance between adjacent PEDOT-rich domains. It enhances ammonia sensitivity by providing additional ionic carriers and carrier transport paths within the PEDOT:PSS molecule. The results demonstrated a significant enhancement in the sensitivity of PEDOT:PSS sensor doped with FeCl 3 , exhibiting a response value of about 25 % at 25 ℃ for 1 ppm NH 3 , with an impressive detection limit of 0.23 ppm and quantification limit of 0.78 ppm (1–400 ppm). Moreover, it showcases acceptable repeatability both at 1 ppm (RSD = 4.30 %) and 100 ppm ammonia (RSD = 3.61 %), along with the notable selectivity and long-term stability. XPS, Raman analysis, and the density function theory (DFT) calculations further elucidated the sensing mechanism of the sensor towards ammonia. Additionally, a portable wireless detection device was designed, which was equipped with the Bluetooth communication and the micro-controller system to detect the decay process of fresh shrimp, realizing wirelessly real-time monitoring of food freshness through a smart phone. It’s worth noting that the innovative sensing technology holds great promise for food quality monitoring.
研究领域:
食品科学
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材料科学
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传感技术
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2016
·
IF 3.485
Quan Yuan,Guo-Hua Sun,Ke-Fei Han,Jing-Hua Yu,Hong Zhu,Zhong-Ming Wang
A series of copolymers, which can also be regarded as ABPBIs containing phenoxyl in the main chain, were synthesized by copolymerization of two kinds of self-polycondensation monomers: 3,4-diaminobenzoic acid (DABA) and 4-(3,4-diamino-phenoxy)-benzoic acid (DPBA). The phenoxyl-containing ABPBIs exhibit better processability and acid stability than original ABPBI, despite their affinities towards acid decrease with the addition of phenoxyl moieties. By adjusting the phenoxyl content of the polymer, we made a tradeoff between acid doping levels and proton conductivity, with mechanical properties. The optimal polymer therein, PO-AB-50 (50 M percentages of DPBA in total monomers), exhibits considerable proton conductivity (53.47 mS/cm at 160 °C) and tensile strength (1.9 MPa) after doped with phosphoric acid. In addition, the oxidation stability, water uptake and swell ratio properties of the polymers were also improved with the introduction of phenoxyl moieties.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Yujian Bai,Rui Zhu,Jie Zhao,Guofeng Cui
A polyaniline pH sensor with super-Nernstian sensitivity (>59.12 mV/pH) was obtained through acid doping. After preparing polyaniline sensor by potentiostatic electropolymerization, the electrochemical property of sensor can be modulated by adjusting acid doping formulas. The result shows that when using doping solution containing 2.2 g/L sodium dihydrogen phosphate and 5 g/L sodium chloride at pH = 6, the polyaniline sensor exhibits a linear super-Nernstian behavior (−69.31 ± 1.66 mV/pH) in PBS buffer (pH 5.00 ∼ 9.00). We observed that the surface of electrode has a three-dimensional network structure which can greatly increase the surface area of the sensing film, thus improving the conductivity and the sensitivity of the senor. The mechanism of acid doping is revealed: phosphate and polyaniline form salt, which makes polyaniline change from insulator to metal state and improves the conductivity. This is one important reason for its super-Nernstian behavior. In order to better understand this behavior, a new super-Nernstian model is established. The parameter 1/r > 1 is introduced to represent the acid doping index of the sensor, which directly affects the sensitivity of the film. According to the formula, super-Nernstian behavior of pH sensor can be mathematically modeled. This investigation yields a consistently stable super-Nernstian pH sensor while providing enhanced insights into its super-Nernstian characteristics and underlying mechanisms.
研究领域:
材料科学
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电化学
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传感技术
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
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2024
·Vol. 31
·期 3
·1-13
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IF 2.6
Li Shuo,Tao Yulun,Wu Yuannan,zhu Shanshan,Khademi Sara,lv Yinru,Tai Yanlong,Wang Chaoran
The high integration and multifunctionality in flexible electronic device play an important role in its development. In this study, we developed multifunctional hydrogels integrated with supercapacitive, photoelectric, and strain-sensing capabilities. The hydrogel composite consists of PAM/PVA matrix with polyaniline (PANI) and reduced graphene oxide (rGO) as conductive components. Two different acid dopants, citric acid (CA) and hydrochloric acid (HCl), were employed to investigate their impact on photoelectrochemical capabilities of hydrogels. Both CA-doped and HCl-doped hydrogels exhibited remarkable supercapacitive performance, achieving areal capacitances of 492 mF/cm 2 and 538 mF/cm 2 , respectively. Furthermore, both hydrogels demonstrated photosensitivity towards shorter wavelengths such as ultraviolet (380 nm) and blue (475 nm) light. Lastly, the proposed hydrogels serving as highly sensitive strain sensors was verified through effectively sensing arm bending movements.
研究领域:
材料科学
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电化学
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光电子学
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传感器
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 5
·e56438
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IF 2.7
Jiawei Hai,Chuang Zhan,Xunwei Chen,Biwei Qiu
This study explores how acid type (hydrochloric acid [HCl], p-toluenesulfonic acid [TSA], and formic acid [FA]) and concentration affect the structure of polyaniline (PANI) and the electrochemical properties of its composite with vertically aligned single-walled carbon nanotubes (SWCNTs). PANI doped with TSA (PANI-TSA) exhibited improved dispersion and conjugation attributed to the larger anion volume, which mitigates interchain spacing, in contrast to PANI doped with HCl (PANI-HCl) and FA (PANI-FA). Additionally, varying the organic acid concentration affected PANI's morphology and the concentration of quinone structure, with TSA leading to a fibrous structure and enhanced electrochemical characteristics. The study further investigated the SWCNTs/PANI composite, revealing that higher TSA concentrations enhance conductivity and specific capacitance of the composite membrane due to sulfonic acid group. Notably, HCl-based SWCNTs/PANI only at higher acid concentrations exhibits superior electrochemical characteristics than TSA-based SWCNTs/PANI, achieving charge transfer resistance down to 5.514 Ω cm 2 at 1.0 mol/L. Moreover, applying an electric field during membrane synthesis significantly increased the specific capacitance of composite prepared with PANI-TSA, highlighting the role of voltage in optimizing electron transport efficiency within the composite.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
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2023
·
IF 1.5
Haichao Zhao,Tong Liu,Chengcheng Jiao,Feng Yang
In this work, epoxy coatings containing phytic acid-doped tetraaniline (PATA) nanoparticles for Q235 steel were prepared and their anticorrosive properties were investigated. Synthesized PATA nanoparticles were characterized by scanning electron microscope (SEM), scanning probe microscope (SPM), photoelectronic spectroscopy (XPS), and Raman test. The anti-corrosion properties of coating were studied by the open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and scanning vibrating electrode technique (SVET). The experimental results showed that the content of the PATA nanoparticle has a positive effect on the barrier ability of the epoxy matrix. The epoxy coating containing 0.25 wt% of PATA nanoparticles has superior corrosion protection property and a satisfactory self-healing effect. The self-healing effect of PATA/EP coating ascribes to the synergistic effect of the passivation of phytic acid ions and tetraaniline. As an effective anticorrosion filler, the PATA nanoparticle has the potential to apply to the field of corrosion protective coating.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Polymer-Plastics Technology and Materials
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2020
·
IF 0
Shanshan Wang,Qifeng Li,Fanghui Wang
Designed and synthesized a series of imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) (Im-PPO) containing pendant imidazole groups, which were used to supply functional sites for acid–base interaction with the doping phosphoric acid. The imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) membranes obtained by the solution-casting method were doped with phosphoric acid (PA). The PA content, swelling, and tensile strength of the different membranes doped with PA were measured. With the increase of the length of side chains on the imidazole groups, the membrane showed different properties. The proton conductivity at a level of 3.7 × 10−2 S/cm was achieved at 160°C by the MeIm-PPO imidazolium composite membrane.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 2
·024502
·
IF 4.386
Chao Meng,Dongmei Han,Shan Ren,Shuanjin Wang,Min Xiao,Yuezhong Meng
In the present work, a cross-linked high-temperature proton exchange membrane based on poly [2, 2'-(p-oxydiphenylene)-5, 50-benzimidazole] (OPBI), imidazole (Im) and hexachlorocyclotriphosphazene (HCCP) was prepared and characterized, aiming at their future application in fuel cell devices. The composite membranes were characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray (EDX) and thermogravimetric analysis (TGA). The results show that the PBI are successfully cross-linked by the cross-linking agent, and the membranes are uniform and compact, with excellent thermal stability. Phosphoric acid (PA) doped crosslinked membranes have excellent mechanical properties and proton conductivities. The tensile strength of PA-doped PBI-ImCCP-20% at room temperature is 20 MPa, and the proton conductivity reaches 53 mS cm−1 at 160 °C without humidification. H2/O2 fuel cell assembled with PA-doped PBI-ImCCP-20% membrane delivered a peak power density of 749 mW cm−2 at 160 °C under anhydrous conditions. The excellent performance of PBI-ImCCP series cross-linked membranes makes them potential candidate for HT-PEMFC applications.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 28
·17243-17251
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IF 10.7
Sifan Chen,Zhuang Ma,Jialin Zhang,Jianchun Niu,Shuomeng Zhang,Qinghua Zhang,Shiyuan Chen,Shanfu Lu,Miao Wang,Qinggang He
Proton-exchange membranes are considered the core of high-temperature proton-exchange membrane fuel cells (HT-PEMFCs) and determine the output power of the cells. However, current HT-PEMs, which are mainly doped with phosphoric acid (PA), face challenges such as low conductivity and loss of PA during cell operation. In this study, cardo poly(biphenyl indole) membranes (POXIA-QA) with quaternary ammonium salt terminals and tunable side-chain lengths were designed at the molecular level. The rational structural design enabled PA to form a continuous hydrogen-bonding network in POXIA-QA, which could be effectively immobilized and retained. The proton conductivity and activation energy patterns were found to be inconsistent with the PA doping level, suggesting that proton transportation depends not exclusively on the amount of PA but also on the PA distribution induced by the acidic spacer. The polymer membrane bearing a hexyl side chain spacer exhibited excellent proton conductivity (0.113 S cm−1 at 180 °C) and single-cell power density (1001.3 mW cm−2 at 180 °C). This study provides insights into the microphase separation, PA distribution, proton transfer, and high-temperature fuel cell performance of phosphonic acid-doped HT-PEMs with side chains and establishes structure–performance relationships. This study is expected to provide a theoretical basis and suitable candidate materials for the design of HT-PEMs.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Pengju Guo,Mengtian Ci,Mayong Zhao
Using pyrroleand benzene carboxylic acid as raw materials, composite materials (BeAcLi/PPy) were successfully prepared by redox method. The structures, morphologies and battery performances of PPy and the composite materials (BeAcLi/PPy) were obtained with FTIR, SEM, CVand EIS. Battery performances of PPy andcomposite materials (BeAcLi/PPy) were obtained with a constant charge/discharge current. Test results revealed that PPy and the composite materials (BeAcLi/PPy) had reversible redox processes from 2.0-4.0 V. Thedischarge specific capacities of BeAcLi/PPy (3:1) and BeAcLi/PPy (5:1) were 74.5 and 57.8 mAh·g -1 , respectively, as measured at 20 mA·g −1 between 2.0 and 4.0 V; these results were evidently better than that of PPy (29.7 mAh·g -1 ) under identical experimental conditions. Additionally, the rate performances and cycling performances of the composite materials significantly improved. The excellent electrochemical performances of composite materials were mainly due to the introduction of BeAcLi as a dopant, thereby improving the polarization of PPy. In addition, the prepared composite materials had a uniform and open loosely stacked structure, which was conducive for increasing contact area between electrode material and electrolyte. As a result, the availability of active material improved, and the electrochemical properties improved.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yiming Xiao,Shihao Wang,Guiying Tian,Jun Xiang,Lei Zhang,Penggao Cheng,Jianping Zhang,Na Tang
Phosphoric acid-doped polybenzimidazole membranes have exhibited great potential in high-temperature proton exchange membrane applications, but proton conductivity and stability should be further improved for high performance fuel cells . Herein, a series of grafted polybenzimidazoles containing benzimidazole type side pendant were successfully prepared by facile N-substitution reaction without any catalyst. These grafted polybenzimidazole membranes with side chains of benzimidazole group exhibit excellent properties in the doping level of phosphoric acid, retention stability of phosphoric acid and proton conductivity under certain mechanical properties , oxidation resistance and thermal stability. Importantly, the phosphoric acid (PA) retention stability and proton conductivity can be preciously controlled by adjusting the length of side chain and the number of benzimidazole groups. With the acid doping level of 19.3, the grafted membrane exhibits a high conductivity of 101 mS cm −1 and a great power density of 305 mW cm −2 at 160 °C without humidification. The molecular dynamics simulation show that the improved performance of the grafted membrane is mainly due to the increase in the free volume of the polymer membrane, the enhancement of the binding energy and the densification of the hydrogen bond network structure between the polymer membrane and phosphoric acid.
研究领域:
材料科学
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燃料电池研究
✓ 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）