RENEWABLE ENERGY
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2025
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IF 9.1
Shuyu Zhang,Yu Luo,Di Yu,Xianfeng Guan,Wanzhen Wu,Cuicui Li,Guangpeng Ma,Xinpu Zhou,Shuang Wang
Phosphoric acid (PA)-doped polybenzimidazole (PBI) is an ideal choice of membrane materials for high temperature proton exchange membrane fuel cells (HT-PEMFCs) as efficient clean energy devices. PA-doped PBI (PBI/PA) membranes exhibit favorable proton conductivity. However, extended usage results in the leaching of PA and the deterioration of mechanical qualities. Here, we prepared composite membranes of quaternised linear polymeric ionic liquid (PIL)/PBI containing side chains of quaternary ammonium (QA) and siloxane groups through a series of treatments. This design improves both proton conductivity and PA retention through the QA group, the conserved NH site and the high attraction of PIL to PA. Meanwhile, the introduced siloxane cross-linked structure ensures the mechanical properties and chemical stability of the membranes. Among them, QMPBI-P-O 10 -T 90 (P: PIL, O: TOPEA, T: TEA) membrane achieves a proton conductivity of 135.5 mS cm −1 at 180 °C and a PA retention of 85.3 % at 160 °C/0 % RH. In addition, at 160 °C without humidity, the peak power density of QMPBI-P-O 10 -T 90 membrane can reach 523.2 mW cm −2 . This synthesis strategy offers a promising new approach to fabricate polymeric ionic liquid-based crosslinked membranes for various applications.
研究领域:
高分子化学
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燃料电池
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Hongying Tang,Ge Chao,Jian Gao,Yuntao Shang,Nanwen Li,Kang Geng
To further mitigate the phosphoric acid leakage in high temperature proton exchange membrane (PEM), the microporosity of Tröger's base (TB) membrane based on a V-shaped bridged bicyclic diamine has been fine-tailored readily by polymeric blending with a miscible polymer of intrinsic microporosity (PIM-1). As expected, the average cavity radius in the range of 3.46–4.21 Å has been achieved when the blending ratio of PIM-1 increases from 5 to 20 mol% due to the interaction between the amine group of TB and the nitrile group of PIM-1. The resulting PEMs show excellent PA retention ability. Notably, PIM/TB9 membrane with a suitable cavity radius of 3.5 Å and largest FFV 4 of 49.1% exhibits an exciting PA retention of about 80%, which is much better than the pristine TB membrane. Thus, the remaining proton conductivity of PIM/TB9 is almost 5 times higher than that of TB membrane after 22 relative humidity cycle tests. Moreover, the resulting cell can run smoothly within a wide temperature range from 0 to 160 °C. The single cell performs for over 150 AST cycles and remains stable for >600 h with no visible voltage decay at 80 °C. Therefore, these results indicate the technical feasibility to improve the PA retention via fine-tuning the intrinsic microporosity of the PEMs through a direct blending method.
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
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Huixuan Wang,Gaofei Pan,Zhunze Ji,Yuwei Ma,Weixiang Shang,Hongxia Li,Fei Ruan,Qingchun Wang,Jinxiao Bao
Increasing the retention of phosphoric acid (PA) may significantly boost the performance of proton exchange membranes (PEMs). In this work, mesoporous titanium dioxide (TiO 2 ) nanoparticles were introduced into polybenzimidazole (PBI) membranes and crosslinked using a silane coupling agent–modified ionic liquid (IL). TiO 2 nanoparticles with high specific volume were combined with ILs to enhance PA retention and inhibit leaching, thereby improving the performance of PEMs. Strong proton conductivity (0.092 S cm −1 , 140 °C) combined with saturated electron transport and outstanding PA retention is made possible by a special proton transfer channel with a silane-bonded titanium dioxide structure. At 140 °C, having an excellent stabilizing current demand of 200 mA cm −2 during 110 h of operation, a hydrogen/oxygen (H 2 /O 2 ) cell founded on the as-fabricated membrane demonstrated outstanding long-term stability and a maximum power density up to 668 mW cm −2 . A high-temperature PEM (HT-PEM) that can function across an extensive temperature spectrum of 80 °C to 200 °C without the need for external humidification is created when stabilized PBI chains are coupled with hydrogen-bonded proton transport channels.
研究领域:
材料科学
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化学工程
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能源技术
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
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2024
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IF 9
Xianfeng Guan,Di Yu,Yu Luo,Shuyu Zhang,Wanzhen Wu,Xu Feng,Tongtong Gao,Wenyu Bai,Shuang Wang
Amino-type polybenzimidazole is prepared, then ionic liquid with three nitrogen positive sites ([CTDTr]Br 3 ) is polymerized into polymeric ionic liquids (PILs) by in-situ radical polymerization, and AmPBI-CTDTr-P x membranes were prepared by piperidinium (PPd) and [CTDTr]Br 3 combination to cross-linked with AmPBI. Following treatment with KOH and phosphoric acid (PA), the ion pairs (N + - H 2 PO 4 − ) generated in the composite membrane system can enhance proton conductivity and facilitate proton transport. The AmPBI-CTDTr-P x membranes shown exceptional PA retention as a result of the alkaline properties of both [CTDTr]Br 3 and PPd, which can engage in acid-base interactions with phosphoric acid. Specifically, the proton conductivity of AmPBI-CTDTr-P 5 at 180 °C is 129.7 mS cm −1 , which is 2.52 times that of pure membranes. Acid retention of AmPBI-CTDTr-P 5 at 80 °C/40 % RH and 160 °C are 64.4 % and 84 %.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Huihui Luo,Fan Yang,Chao Li,Yifei Zhong,Cheng Cheng,Shaolei Wang,Shangbin Jin
Anhydrous proton conducting polymer membrane materials have raised much attention in the application of high-temperature proton-exchange membranes (HT-PEMs) fuel cells, which convert chemical energy into electrical energy. Polybenzimidazole-based polymers, as typical materials for HT-PEMs, their compact structures result in small fractional free volumes (FFV), which is not conducive to the adsorption and retention of proton carriers. Herein, a series of polybenzimidazole-based polymers of intrinsic microporosity (PIM-PBIs) were synthesized. PIM-PBIs possess the benzimidazole units and porous structures, and have good thermal stability and large specific surface area (100 ∼ 400 m 2 /g). PIM-PBIs are further embedded in polyvinylidene fluoride (PVDF) to form mixed matrix membranes for high-temperature proton conduction. The resulting membranes exhibit high proton conductivity up to 90.11 mS cm −1 at 140 ℃ and high phosphoric acid (PA) retention rate of 90.0 %. This work provides a facile method for the precise design and preparation of proton-conducting porous materials.
研究领域:
材料科学
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能源工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Hao Chen,Shuang Wang,Fengxiang Liu,Di Wang,Jinsheng Li,Tiejun Mao,Geng Liu,Xu Wang,Jingmei Xu,Zhe Wang
A major problem faced by phosphoric acid doped polymer electrolyte membranes is leaking out easily as the reaction proceeds. Here, the long alkyl side chains with quaternary ammonium groups grafted the polybenzimidazole membranes (PBI-Sc-X) are prepared. The strong interaction between quaternary ammonium and biphosphate ion-pairs keep phosphoric acid (PA) in base-acid doped membranes. As a result, the remaining PA weight of PBI-Sc-X membranes could hold above 80%, which is better than that of pure PBI. Besides, it is observed that the highest power density of 411.7 mW/cm 2 at 160 °C under current density 1000 mA/cm 2 is obtained with base-acid doped PBI-Sc-5 membranes. Furthermore, the PBI-Sc-X membranes show considerable performance in oxidative stability, mechanical strength and thermal stability, which gave a basis for HT-PEMFCs application.
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
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Xiaobai Li,Hongwei Ma,Peng Wang,Zhenchao Liu,Jinwu Peng,Wei Hu,Zhenhua Jiang,Baijun Liu
The practical applications of phosphoric acid-doped polybenzimidazole (PA–PBI) as high-temperature proton exchange membranes (HT-PEMs) are mainly limited by their poor dimensional-mechanical stability at high acid doping levels (ADLs) and the leaching of PA from membranes during fuel cell operation. In this work, to overcome these issues, we fabricated novel cross-linked PBI networks with additional imidazole groups by employing a newly synthesized bibenzimidazole-containing dichloro compound as cross-linker and an arylether-type Ph-PBI as matrix. Ph-PBI featured by good solubility under high molecular weight offers satisfactory film-forming ability and mechanical strength using for the matrix. Importantly, the additional imidazole moieties in BIM-2Cl endow the cross-linked PBI membranes improved dimensional-mechanical stability with simultaneously enhanced ADLs and proton conductivity. Furthermore, superior acid retention capability is obtained by incorporating porous polyhydroxy SiO2 nanoparticles into these cross-linked networks. As a result, the SiO2/cross-linked PBI composite membranes are suitable to manufacture membrane electrode assemblies (MEAs), and an excellent H2/O2 cell performance with a peak power density of 497 mW cm–2 at 160 °C under anhydrous conditions can be achieved.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food and Bioprocess Technology
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2025
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IF 5.8
Liu Zhenbin,Luo Jia,Zhang Jiayi,Liu Wenchao,Li Hongbo,Hu Liangbin,Wang Dong,Hengchao E,Sun Zhenying,Xia Yu,Weng Rui,Mo Haizhen
Multi-phase microwave drying (MMD) uses microwaves as a heat source while adjusting chamber pressure to dry materials, enabling solid-liquid-gas phase transitions of water. This method significantly shortens drying time and reduces energy consumption. This study explores MMD’s feasibility as an efficient and high-quality drying technique for shiitake mushrooms, comparing it with hot air drying (HAD), heat pump drying (HPD), freeze drying (FD), and microwave vacuum drying (MVD). The results show MMD dries mushrooms in 105 minutes, achieving speeds 5, 7, and 13 times faster than HAD, HPD, and FD, respectively. MMD also significantly reduces shrinkage (14.0%) and improves rehydration (519.4%), surpassing HAD, HPD, and MVD by 66.79%, 60.99%, and 269.53%. Additionally, MMD better preserves volatile compounds and the mushrooms’ original flavor, reducing losses due to overheating. Nutritionally, MMD retains higher levels of amino acids (34.92 mg/g) and nucleotides (160.31 mg/100 g), boosting umami flavor (786.96 g MSG/100 g). This method combines microwave drying’s efficiency with freeze drying’s quality benefits.
研究领域:
食品科学
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农产品加工
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干燥技术
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食品质量
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食品营养
✓ 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
ACS Applied Polymer Materials
·
2024
·
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 POWER SOURCES
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2021
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IF 9.127
Fengxiang Liu,Shuang Wang,Di Wang,Geng Liu,Yinghe Cui,Dan Liang,Xiaodong Wang,Zhipeng Yong,Zhe Wang
Novel high temperature-proton exchange membranes (HT-PEMs) are prepared based on norbornene-type PBI (NbPBI) and double bond ionic liquids . For comparison, three ionic liquids are selected to prepare NbPBI-PIL membranes. Herein, the ionic liquids are synthesized into poly(ionic liquid)s (PILs) by in-situ free radical polymerization . Simultaneously, the PILs also react with the norbornene monomer of NbPBI to form a cross-linked network. After acid-base doping, the Br − or Cl − of PILs are successfully replaced with H 2 PO 4 − to promote proton transport. Notably, the NbPBI-PIL membranes exhibit high proton conductivity and enhanced phosphoric acid retention, especially the NbPBI-MPIm membrane has a proton conductivity of 0.074 S cm −1 at 170 °C and phosphoric acid retention of 87.2% and 73.8% under 160 °C and 80 °C/40 RH%, respectively. The single-cell with NbPBI-TPAm membrane obtains the highest power density of 385 mW cm −2 at 160 °C and negligible single-cell voltage decay after the 200-h test.
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
ACS Sustainable Chemistry & Engineering
·
2018
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IF 6.14
Fengxiang Liu,Shuang Wang,Hao Chen,Jinsheng Li,Xue Tian,Xu Wang,Tiejun Mao,Jingmei Xu,Zhe Wang
A series of composite cross-linked membrane based on fluorine-containing polybenzimidazole (6FPBI) and a cross-linkable polymeric ionic liquid (cPIL) have been prepared for high temperature proton exchange membrane (HT-PEM) applications. Particularly, the obtained composite cross-linked membranes showed excellent phosphoric acid doping ability and proton conductivity. On the basis of the trade-off between mechanical strength and proton conductivity of composite membranes, the optimal content of cPIL is 20 wt % (6FPBI-cPIL 20 membrane). For instance, the 6FPBI-cPIL 20 membrane with a PA doping level of 27.8 exhibited a proton conductivity of 0.106 S cm–1 at 170 °C, which is much higher than that of pristine 6FPBI membrane. The most outstanding contribution of this work is that the 6FPBI-cPIL membranes showed improved phosphoric acid retention and long-term conductivity stability under harsh conditions (80 °C/40% RH) for 96 h. In particular, the proton conductivity and PA doping level of the 6FPBI-cPIL 20 membrane remained at a high level of 0.064 S cm–1 and 8.5 after 96 h of the test, respectively.
研究领域:
材料科学
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化学工程
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电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）