ACS Applied Polymer Materials
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2024
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IF 4.4
Shuyu Zhang,Yu Luo,Di Yu,Xianfeng Guan,Wanzhen Wu,Cuicui Li,Guangpeng Ma,Xinpu Zhou,Shuang Wang
Quaternary ammonium (QA) group is widely used in high-temperature proton exchange membranes (HT-PEMs) because of its own strong basicity and ability to form QA–diphosphate ion pairs with phosphoric acid (PA). In this work, compared with other introductions of QA groups in membranes, by adding QA sites to the polybenzimidazole (PBI) main chains, not only PA retention is improved but also the imidazole N–H sites are conserved, which allow them to participate in proton transfer and further improve proton conductivity. QMPBI was prepared by introducing QA groups into the main chains of methyl-containing polybenzimidazole (MPBI) through a series of modifications in order to improve PA uptake and retention. Then, QMPBI and presynthesized polymeric ionic liquid (PIL) containing two nitrogen-positive ion pairs undergo cross-linking to generate composite membranes with different quaternization ratios-QMPBI-X-PIL (where X = 30, 50, 70%). It is experimentally verified that the QMPBI-70%-PIL membrane at a quaternization ratio of 70% has the best proton conductivity and PA retention rate. The QMPBI-70%-PIL membrane had a proton conductivity of 126.22 mS cm–1 at 180 °C and a maximum residual mass of 85.71% at 160 °C/0% RH after a 240 h PA retention test. At 160 °C without humidity, the peak power density of the QMPBI-70%-PIL membrane could reach 454.89 mW cm–2. In conclusion, QMPBI-70%-PIL membranes are expected to be widely used in HT-PEMs.
研究领域:
材料科学
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电化学
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Zhongming Xu,Nanjie Chen,Sheng Huang,Shuanjin Wang,Dongmei Han,Min Xiao,Yuezhong Meng
High temperature proton exchange membrane fuel cells (HT-PEMFCs) has become one of the most promising sustainable energy conversion technologies due to its cleanliness, high resistance to CO toxicity and simplified hydrothermal management. A major challenge is how to improve the acid retention in phosphoric acid (PA)-doped polymer electrolytes in HT-PEMFCs to obtain cells with extended durability. In this work, asymmetric PA-doped polybenzimidazole membranes (PA-APBI-ZrP(X)) with PA-doped poly [2,2‘-( p -oxydiphenyl)-5,5’-biphenylimidazole] (OPBI) membranes as the substrate and the OPBI/zirconium phosphate nanosheets composite coating layer (OPBI/ZrP(X)) on the cathode-contact side were prepared for the first time via hot pressure transfer method. The parallel distribution and high barrier property of the ZrP nanosheets constructed tortuous ion transport channels and mitigated the PA loss from membrane to the catalyst layer, which significantly improved the durability of HT-PEMFCs. The prepared PA-APBI-ZrP(20) membranes exhibited a low voltage decay rate in the 72 h accelerated stress test (AST), and the cell voltage achieved almost no decay (4.76 μV h −1 ) for 420 h at the operating current. The idea of cathode-side coating with a nanocomposite layer provides a feasible strategy to achieve the long-term operation of HT-PEMFCs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
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2020
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IF 1.539
Chao Meng,Sheng Huang,Dongmei Han,Shan Ren,Shuanjin Wang,Min Xiao
In the present work, a semi-interpenetrating network (semi-IPN) high-temperature proton exchange membrane based on polyethyleneimine (PEI), epoxy resin (ER), and polybenzimidazole (PBI) was prepared and characterized, aiming at their future application in fuel cell devices. The physical properties of the semi-IPN membrane are characterized by thermogravimetric analysis (TGA) and tensile strength test. The results indicate that the as-prepared PEI-ER/PBI semi-IPN membranes possess excellent thermal stability and mechanical strength. After phosphoric acid (PA) doping treatment, the semi-IPN membranes show high proton conductivities. PA doping level and volume swelling ratio as well as proton conductivities of the semi-IPN membranes are found to be positively related to the PEI content. High proton conductivities of are achieved at 160°C for these PA-doped PEI-ER/PBI series membranes. H2/O2 fuel cell assembled with PA-doped PEI-ER(1 : 2)/PBI membrane delivered a peak power density of 170 mW cm-2 at 160°C under anhydrous conditions.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Yiming Xiao,Zetao Yang,Haoran Chen,Yifang Gao,Jianxiang He,Guiying Tian,Lei Zhang,Penggao Cheng,Na Tang
High phosphoric acid (PA) retention stability and exceptional proton conductivity are critical for practical applications of PA-doped polybenzimidazole (PBI) membranes as high-temperature proton exchange membranes (HT-PEMs). In this study, TBPP-OPBI membranes were fabricated by crosslinking poly[2,2′-(p-oxydiphenylene)-5,5′-bibenzimidazole] (OPBI) with halogen-functionalized porphyrin (TBPP), followed by quaternization to produce quaternized porphyrin (QTBPP) crosslinked OPBI membranes (QTBPP-OPBI). Building upon the mechanically robust crosslinked framework, dual ionic pair structures were constructed through protonation of porphyrin rings and incorporation of quaternary ammonium groups. This design simultaneously enhances polymer-PA interaction energy and increases H 2 PO 4 − content within the membrane, thereby significantly improving PA doping stability and proton conductivity. The 0.81-QTBPP-OPBI membrane demonstrated a proton conductivity of 345 mS cm −1 at 180 °C and a peak power density of 576.6 mW cm −2 at 160 °C, representing 5.1-fold and 3.2-fold enhancements over the OPBI membrane, respectively, while maintaining excellent fuel cell stability beyond 200 h. This work thus establishes a straightforward structural design strategy to enhance the application performance of PA-PBI proton exchange membranes.
研究领域:
高分子化学
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材料科学
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电化学
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能源材料
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膜科学
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燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Han Sun,Shuang Wang,Yinghe Cui,Zhipeng Yong,Dan Liang,Xiaodong Wang,Xiaorui Wang,Chenglong Li,Feng Pan,Zhe Wang
Branched polymers have unique three-dimensional dendritic structures, so they have received a lot of attention in the application of high temperature proton exchange membranes . In this work, we synthesize BOPBI-X (X = 3%, 6%, 9%) membranes with different branched ratios based on the synthesis of OPBI, due to the introduction of a rigid triazine structure with a larger free volume, the membranes could absorb more phosphoric acid (PA) while maintaining sufficient mechanical strength . Among them, the BOPBI-6% membrane obtains splendid comprehensive performance, when the PA doping level (ADL) is 9.55, it achieves a proton conductivity of 99.2 mS cm −1 at 180 °C, which is 1.8 times higher than OPBI (54.8 mS cm −1 ), and it performs well in long-term oxidation stability test after 144 h, it still has a mass retention rate of 90%. For the sake of further boost the performance of the membrane, cross-linkable polymeric ionic liquid (PIL) is introduced to the system. Among them, BOPBI-PIL-30% membrane has sufficient mechanical properties (5.50 ± 0.8 MPa), and the proton conductivity (146.9 mS cm −1 ) at 180 °C is also excellent, so BOPBI-PIL-30% membrane is expected to be a promising candidate as HT-PEMs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Junqiao Jiang,Min Xiao,Sheng Huang,Dongmei Han,Shuanjin Wang,Yuezhong Meng
Phosphoric acid (PA)-dependent proton conductivity and polymer-offered mechanical properties are contradictory in high-temperature proton exchange membranes (HT-PEMs). Microphase separation strategy contributes to achieve a tradeoff between proton conductivity and mechanical properties. Herein, a kind of phosphonic acid-imidazolium containing polymer (PICP) ionomeric membranes, in which acidophilic (imidazolium) and acidophobic groups (-PO 3 H 2 ) can be induced to form a microphase separation structure by PA, are firstly prepared. The acidophilic phase with adsorbed PA plays the role of proton conduction and the acidophobic phase can not only provides -PO 3 H 2 group synergistically conduct protons but also largely maintains the intrinsic mechanical properties. As a result, the PICP ionomeric membranes with microphase separation structure possess high proton conductivity (48 mS cm −1 , 160 °C) and satisfying mechanical strength (16.5 MPa) simultaneously at a moderate PA doping level (130 wt%). The fuel cell based on such HT-PEMs demonstrates a peak power density of 493 mW cm −2 and high voltage stability. This is the first report of phosphonic acid-imidazolium containing ionomeric membranes with satisfactory fuel cell performance and durability, representing a meaningful step towards practical HT-PEM fuel cells.
研究领域:
材料科学
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化学工程
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能源技术
✓ 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）