JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Liu Haiyan,Ma Huihuang,Xu Yiqing,Zhou Xiaodong
This study introduces a novel sandwich-structured composite incorporating varying contents of zirconium diboride (ZrB 2 ), with polybenzimidazole (PBI) as the resin matrix and quartz fiber felt (QF) as the reinforcement. The ablative performance of the composites was assessed under high-energy continuous wave laser conditions, featuring a laser power density of 30 MW m -2 , and the laser ablation morphology and ablation mechanism of the ZrB 2 /PBI/QF composites were investigated. Further analysis examined the effects of ZrB 2 ceramic content on the density, thermal stability, mechanical properties, ablation characteristics, and rear surface temperature of the composites. Upon laser ablation, ZrB 2 oxidizes, forming a protective white ZrO 2 layer. At a 60% ZrB 2 content, the rear surface temperature of the composites reached 1031 °C after 42 s, resulting in a low linear ablation rate (0.12 mm s -1 ). The gases and residual carbon produced by the pyrolysis of PBI resin, the melting of QF, and the release of SiO 2 gas contribute to the formation of a SiO 2 protective layer. Building on this foundation, the incorporation of ZrB 2 further enhances energy dissipation and facilitates the development of a ZrO 2 -SiO 2 protective layer with increased reflectivity. This layer, along with another oxidation product, B 2 O 3 gas, serves to isolate oxygen and mitigate erosion. The findings suggest significant potential for developing advanced materials for high-energy continuous wave laser protection.
研究领域:
材料科学
·
热防护系统
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产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Yanmei Zhu,Chao Zhou,Li Liu,Guangfeng Wu
A new crosslinker, terminal amine-based polybenzimidazole (PBI–4NH 2 ), was made by molecular structure design. The structure of PBI-4NH 2 is characterized by –NH 2 , which can interact with –NCO in aqueous polyurethane systems to form a crosslinking network in the main chain of WPUs efficiently. The PBI-4NH 2 contains five benzene rings, which can significantly improve the overall performance of WPUs. The impact of incorporating PBI-4NH 2 on the thermal resistance, hydrophobicity, and adhesion properties of WPU was examined. The enhancement of PBI-4NH 2 concentration in the WPU system markedly elevated the thermal stability of the coatings, as evidenced by the rise in the T50 % decomposition temperature from 374.1 °C to 394.6 °C. The system's water resistance was markedly enhanced, achieving a maximum water contact angle of 91.1° and a reduction in water absorption rate to 4.79 %. The film's peel strength rose to 3.53 N/mm, while the adhesion attained 1.24 MPa. The novel formulation demonstrated superior overall performance and offered significant reference value for the practical application of aqueous polyurethane coatings.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jiayu Yang,Xiaobai Li,Chengying Shi,Bairun Liu,Kaiyue Cao,Cengliang Shan,Wei Hu,Baijun Liu
Because of the harsh operating circumstances of high temperature over 100 °C and strong acidity, it is of great significance to explore some new methods on the developments of high-performance membrane materials using in high-temperature proton exchange membrane fuel cells (HT-PEMFCs). In current work, with the assistance of newly designed sulfonated poly (aryl ether ketone) (SPAEK) compatibilizer , some hydrophilic and acidophilic polyhedral-oligosilsesquioxane nanoparticles bearing sulfuric acid groups (SPOSS) were successfully incorporated into a soluble arylether-type polybenzimidazole (Ph-PBI) matrix via an in situ sol-gel process to obtain a new family of hybrid membranes with an improved overall performance. As a result, these hybrid membranes exhibited enhanced acid absorption ability and doping levels at 120 °C, improved acid retention ability and attractive mechanical-dimensional stability. More importantly, the proton conductivity of a phosphoric acid doped hybrid membrane reached 126 mS cm −1 at 200 °C. This membrane was also suitable for membrane electrode assemblies (MEAs), and a maximum power density of 300 mW cm −2 could be achieved at 160 °C without humidity.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Haiyan Liu,Huihuang Ma,Yiqing Xu,Xiaodong Zhou
In this work, poly- p -phenylene benzobisoxazole (PBO) fibers reinforced polybenzimidazole (PBI) resin-based laser ablation composites (thickness = 5 mm) with different SiC contents were prepared. SiC/PBI/PBO composites exhibited good mechanical properties , excellent thermal stability and laser ablation properties. The laser ablation properties and ablation mechanism of the composites were investigated using a high-energy continuous-wave laser (30 MW·m −2 ). Increasing the SiC content led to increase in composites density, while decreasing the bending performance of the composites. However, it improves the mass and linear ablation rates, resulting in an overall improvement in ablation properties. At a SiC content of 70 %, the composite exhibited a mass loss of 8.2 %, a mass ablation rate of 9.2 mg·s −1 , and a linear ablation rate of 0.11 mm·s −1 . The ablation process of SiC/PBI/PBO composites was delineated into pre-ablation and post-ablation stages, with the ablated composites divided into the ablation center, transition region, and outer region based on morphological characteristics. After ablation, numerous white hollow SiO 2 spheres and SiO 2 protective layers were formed in the ablation centers, the transition regions were deformed and cracked, while the outer region remained unscathed.
研究领域:
材料科学
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Qi Zhou,Xihao Zhang,Yanbo Zhang,Shaoyu Hou,Jinling Zhao,Hongxiang He,Xiaoliang Wu,Denghua Zhang,Jianguo Liu,Chuanwei Yan
The development of high-performance ion-selective membranes is essential for advancing vanadium flow batteries (VFBs). In this study, we present a novel porous polybenzimidazole (PBI) membrane featuring a distinctive architecture aimed at significantly enhancing ion selectivity. The porous structure was constructed using Fe₂O₃ nanoparticles as a hard template and etched with HCl. This design facilitates efficient proton transport, achieving a reduced area resistance (<0.20 Ω cm 2 ). Simultaneously, the multiple polymer/electrolyte interfaces within the design introduce energy barriers that effectively block vanadium ion transport, resulting in ultralow vanadium ion permeability (<10 −8 cm 2 min −1 ). The PBI-10Fe₂O₃ membrane demonstrated outstanding electrochemical performance, achieving a high energy efficiency (EE) of 81.4 % at a current density of 300 mA cm⁻ 2 . This study demonstrates the effectiveness of tailored porous PBI membranes in achieving both high proton conductivity and strong vanadium ion blocking performance. Moreover, the unique design approach highlights the potential to overcome the trade-off between ion selectivity and proton conductivity, paving the way for next-generation energy storage applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-7
·
IF 2.8
Jiajie Zhu,Gang Cao,Hao Wang,Hao Yan,Wenzhen Wang,Run Xu
In semiconductor radiation detectors, leakage current is a major noise source affecting energy resolution and sensitivity. The surface passivation technology can reduce this leakage current and hence significantly enhance detector performance. Here, we demonstrate a facile way to passivate the surface of the nuclear detectors based on Methylammonium Lead Iodide (MAPbI \(_3\) ) single crystals using soaking treatment in ethanol. A dense passivation layer of PbI \(_2\) was formed on the crystal surface, significantly reducing the surface leakage current by an order of magnitude under the same voltage. The energy resolution of the MAPbI \(_3\) -based detector is therefore improved by nearly 10% for the detection of 59.5 KeV irradiated from \(^{241}\) Am. Therefore, the PbI \(_2\) passivation by ethanol-soaking treatment is proved to be an effective method to reduce leakage current and improve detection performance.
研究领域:
半导体探测器
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材料科学
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核仪器
·
表面钝化
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yiyang Zeng,Shuai Yang,Mao Yang,Yu Gong,Xingrui Tang,Xiaolong Fu,Junyan Wang,Guangming Ran,Chengjian Xiao
Hydrogen separation and purification play a crucial role in the chemical industry. High-temperature electrochemical hydrogen pump (HT-EHP) technology based on polybenzimidazole (PBI) membranes has great potential for hydrogen purification, the key to this application lies in the design of PBI membranes with high proton conductivity. To achieve this, we optimized the spatial conformation of polymer chains by coordinating metal ions (Zn 2+ /Co 2+ ) with the imidazole groups in PBI, forming continuous coordination cavities. Molecular dynamics (MD) simulations revealed that the coordination between metal ions and imidazole induces polymer chain distortion, creating sub-nanometer coordination cavities (∼8 Å). Wide-angle X-ray scattering (WAXS) and wide-angle X-ray diffraction (WAXD) confirmed the existence of these coordination cavities. After the removal of metal ions, the residual cavities were filled with phosphoric acid (PA), constructing long-range ordered proton conduction pathways in the high-performance PBI membranes ( o -PBI-Zn and o -PBI-Co). Scanning electron microscopy (SEM) analysis showed that the continuous porous network within the polymer chains resembles a root-like structure, facilitating efficient three-dimensional proton transport. The resulting membranes exhibited excellent mechanical properties (tensile strength of 45 MPa) and outstanding proton conductivity (0.126 S/cm at 160 °C). When assembled into a HT-EHP, the membranes achieved a hydrogen purification rate of 9.22 mL (cm 2 ·min) −1 at 180 °C, with an energy consumption as low as 0.1 kWh/L(H 2 ). This study presents an innovative strategy for designing high-proton-conductivity PBI membranes, significantly enhancing their potential for HT-EHP applications, offering a promising alternative for hydrogen purification technologies.
研究领域:
材料科学
·
化学工程
·
膜技术
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 4
·1523-1537
·
IF 4.5
Zhang Dongqing,Yu Xiaoguang,Zhang Feng,Liu Wenqi,Miao Jiyuan,Li Xiaojin
High-temperature proton exchange membranes (HTPEMs) based on arginine-modified phosphoric acid-doped polybenzimidazole (Arginine-PBI-PA) and poly(tetrafluoroethylene) phosphoric acid-doped polybenzimidazole (PTFE-Arginine-PBI-PA) were fabricated and characterized for fuel cell applications. Arginine as filler was used to prepare HTPEMs for the first time, and the Arginine-PBI-PA membrane exhibited an excellent proton conducting ability with 24.1 mS cm −1 at 160 °C while maintaining mechanical strength. Furthermore, Arginine-PBI-PA composite membrane was also appropriate for membrane electrode assemblies (MEAs), and it exhibited better fuel cell performances (0.68 V@400 mA cm −2 ) compared with the PBI-PA membranes prepared. Molecular dynamics (MD) simulation revealed that the better electrochemical properties of Arginine-PBI-PA membranes over PBI-PA membranes were ascribed to the strong interactions between the basic sites and carboxyl groups of arginine and PA molecules, respectively. In addition, the higher proton conductivity for Arginine-PBI-PA membranes was attributed to the formation of a tighter H-bonding network and the interaction between arginine non-protonated oxygen (O) and PA protons (HPA). Graphical Abstract
Experimental investigation and molecular dynamics simulation of novel arginine/PBI composite membranes for high temperature PEM fuel cells
研究领域:
材料科学
·
电化学
·
燃料电池技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Rongrong Zhang,Zhen Yan,Zhaodan Xue,Wan Xu,Min Qiao,Liping Ding,Yu Fang
Fluorescent aggregates and ensembles have been widely applied in fabrication of fluorescent sensors due to their capacity of encapsulating fluorophores and modulating their photophysical properties. In the present work, fluorescent ensembles based on anionic surfactant SDS assemblies and perylene derivatives (PBIs) were particularly constructed. Three newly synthesized neutral PBI derivatives with different structures, PO, PC1 and PC2, were used for the purpose to evaluate probe structure influence on constructing fluorescent ensembles. The one with hydrophilic side chains, PO, experienced distinct photophysical modulation effect by SDS assemblies. The ensemble based on PO@SDS assemblies displayed effective fluorescence variation to antibiotic aminoglycosides (AGs). To improve cross-reactivity and discrimination capability of ensembles, a second probe, coumarin, was introduced into PO@SDS assemblies. The resultant ternary sensor, CM-PO@SDS, exhibited good qualitative and quantitative detection capabilities, and achieved differentiation of eight AGs and mixed AG samples both in aqueous solution and actual biological fluid, like human serum. Sensing mechanism studies revealed that hydrogen bonding, electrostatic and hydrophobic interactions are involved in the sensing process. This surfactant-based fluorescent ensemble provides a simple and feasible method for assessing AGs levels. Meanwhile, this work may provide some insights to design reasonable probes for constructing effective single-system based discriminative fluorescent amphiphilic sensors.
研究领域:
分析化学
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药学
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材料科学
·
生物技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chao Chen,Yan Chen,Bing Zhao,Mingjie Ma,Ningbo Wang,Zheng Li,Yunchu Cheng,Ling Zhou,Congjie Gao,Fei Huang,Lixin Xue
Phosphoric acid (PA)-doped high-temperature proton exchange membranes (HT-PEMs) face significant challenges from PA leaching, particularly under low temperatures, which severely compromises their operational durability and flexibility. Herein, we developed innovative polybenzimidazole (PBI)-based PEMs featuring a comb-shaped cationic bridge structure, synthesized via a combined polyphosphoric acid process and heterogeneous free radical polymerization. The resulting membranes exhibited a distinctive porous microstructure characterized by aligned nanosheet arrangements and double dense skin layers, effectively suppressing PA leaching. Strong ion-pair interactions between imidazolium cations and biphosphate enhanced PA retention and promoted PA dissociation, substantially improving proton conductivity. The optimized PA/PBI-AMim-2 membrane achieved exceptional proton conductivity, exceeding 10 mS/cm at −20 °C and reaching 0.34 S/cm at 220 °C, enabling efficient fuel cell operation across a wide temperature range. It demonstrated outstanding single-cell performance, delivering peak power densities of 820 mW/cm 2 at 80 °C and 1605 mW/cm 2 at 160 °C, along with cold start-up capability of 46 mW/cm 2 at −20 °C. Its superior PA retention ensured stable performance with a minimal decay rate of 23.7 μV/h at 40 °C and enabled reliable functionality through 100 frequent start-up/shutdown cycles. This breakthrough bridges the gap between conventional low-temperature and high-temperature PEMFCs, paving the way for robust, flexible and durable systems under real-world operating conditions.
研究领域:
能源材料
·
高分子科学
·
电化学
·
燃料电池
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yongjun Wei,Feiping Lu,Xinqi Ai,Ju Lei,Yong Bai,Ziang Wei,Ziyin Chen
During the solution-based fabrication of perovskite solar cells (PSCs), the rapid and uncontrollable process of crystal nucleation and growth leads to the formation of numerous defects at the surface and grain boundaries, resulting in severe non-radiative recombination, which negatively affects the optoelectronic performance of the device. In this work, two passivation molecules, 2-(3-Pyridyl)-1H-benzimidazole (PBI) and 2-(3-Pyridyl)-1H-benzimidazole-6-carboxylic acid (PBI-CA), were introduced onto the surface of the perovskite film via a post-treatment method. PBI contains two basic functional groups, -C-N and -C N, where the nitrogen atom possesses a lone electron pair. PBI-CA has the same functional groups but also includes a carboxylic acid (-COOH) functional group, which contains both a carbonyl and a hydroxyl group, also having non-bonding electron pairs. The lone electron pairs in these functional groups exhibit Lewis base characteristics, which can coordinate with the uncoordinated Pb 2 + ions in the perovskite film, thereby passivating the ion defects caused by Pb 2+ . Compared to PBI alone, PBI-CA has an additional carboxylic acid group, providing more Lewis base sites, making it more effective in coordinating with Pb 2+ and passivating defects. We investigated the passivation mechanism of these two passivators through first-principles calculations and demonstrated their positive impact on PSCs through experiments and characterizations. The introduction of PBI and PBI-CA increased the size of the perovskite crystals, improved the power conversion efficiency (PCE), and enhanced device stability. The results showed that in a perovskite system with a bandgap of 1.6 eV, the PCE of the PBI-CA-modified device reached 21 %, higher than that of the PBI-modified device (20.3 %) and the baseline device (18.6 %), with significantly improved device stability. These Lewis base-containing molecules can be widely used to fabricate high-performance PSC devices.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 8
·084510
·
IF 3.9
Jinyi He,Tianhui Li,Yingying Liu,Ao Wang,Wenxing Jiang,Chengwei Deng,Junbo Hou,Xiaodong Zhuang,Junliang Zhang,Changchun Ke
Poly[2,2-(m-phenylene)−5,5-bibenzimidazole] (m-PBI), the most studied PBI, is close to practical application, however, the high cost of m-PBI restricts its application for HT-PEMFCs. The cost can be reduced by 85% if the low cost & high impurity industrial DAB can be used to synthesize m-PBI after pre-treatment. Herein, we study the influence of impurities in industrial 3,3'-diaminobenzidine (DAB) on the synthesis of polybenzimidazole (PBI), and the possibility of the synthesis of m-PBI based on purified low cost & high impurity industrial DAB. It is shown that impurities would reduce the molecular weight and thermal stability of PBI, and mechanical strength and oxidation stability of the according PBI and H3PO4/PBI membranes. Using industrial DAB (94.40%) without any treatment as a reactant, the molecular weight of the obtained PBI is too low to prepare a membrane. A simple method of purifying low cost & high impurity industrial DAB is proposed, by dissolution and recrystallization using the absorption effect of carbon powder. It is proven that the performances of PBI synthesized using purified DAB are near to the PBI synthesized using high-purity DAB. The peak power density of HT-PEMFC based on PBI from purified industrial DAB reached 426 mW cm−2 at 180 °C.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）