INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xiaocan Zhang,Jiashu Long,Mengxin Wang,Yiran Liu,Huixiao Ma
Blending metal-organic frameworks to optimize proton transport pathways is one of the strategies to improve the proton conductivity of proton exchange membranes (PEM). In this paper, amino-sulfonic acid bifunctionalized UiO-66 (NUS) by one-pot solvothermal method is synthesized, and sulfonated poly (ether ether ketone)/NUS-X (SPEEK/NUS-X) hybrid membranes are prepared by mixing NUS into SPEEK matrix. Among them, SPEEK/NUS-1.5 has the highest proton conductivity (177.76 mS cm −1 , 70 °C, 100% RH) and maintain a 300 h conductivity stability. And its maximum power density was 423.2 mW cm −2 , exceeding pristine SPEEK by 2.20 times. Compare to the pristine SPEEK membrane, it is interesting to note the disappearance of SAXS scattering peak of SPEEK/NUS-1.5. It is speculated that this phenomenon was caused by the generation of acid-base pairs between –NH 2 and –SO 3 H, and the improved hydrogen bonding network provides more proton transport channels and immobilizes sulfonic acid groups for improved durability. The resultant proton conductivity is stable over 300 h with about 90% retention.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Hao Chen,Shuang Wang,Jinsheng Li,Fengxiang Liu,Xue Tian,Xu Wang,Tiejun Mao,Jingmei Xu,Zhe Wang
A series of cross-linked composite membranes based on polybenzimidazole (PBI) and polymeric ionic liquids (PILs) containing imidazole rings have been successfully prepared. The obtained PIL consisted of polymeric cation PBI-BuI and anion BF 4 − . Here, a concept of dual proton transfer channels was proposed, in which the anions of PIL served as proton receptor through electrostatic interaction and the imidazole rings accepted protons by acid-base effect simultaneously. In order to obtain proton exchange membranes based on PBI/PIL with excellent comprehensive properties, the cross-linkerγ-(2, 3-epoxypropoxy) propyltrimethoxysilane (KH560) is introduced into the matrix to strengthen the mechanical properties by hydrolyzing into Si–O–Si network structure. The composite membranes display excellent mechanical properties, oxidative and thermal stability. In particular, the cPBI-BF 4 -40 membranes with the highest content of PIL shows a proton conductivity of 0.117 S cm −1 at 170 °C and it is good enough both in mechanical and PA uptake, which will make an outstanding candidate over other PBI-based membranes for high temperature proton exchange membrane fuel cell (HT-PEMFC) applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2013
·
IF 2.072
Cheng Chen,Chunhui Shen,Gengjin Kong,Shanjun Gao
High temperature anhydrous proton exchange membranes based on phosphonic acid were prepared from epoxycyclohexylethyltrimethoxysilane (EHTMS) and amino trimethylene phosphonic acid (ATMP) by sol–gel process. The structures and properties of membranes with different phosphonic acid content were extensively characterized by FTIR, TG-DSC and XRD . Their proton conductivity under dry condition was also investigated under different temperature. The results show that the proton conductivity of the prepared membranes strongly depends on temperature, and the proton conductivity ranges from 8.81 × 10 −5 S cm −1 at 20 °C to 4.65 × 10 −2 S cm −1 at 140 °C under anhydrous condition. It indicates that the increasing temperature is favorable for congregating of the grafted–PO 3 H 2 and increasing of the proton mobility. In addition, from the results of AFM images, it was confirmed that the continuous distribution of phosphonic acid groups is favorable for the formation of the proton transport channel, which can significantly enhance the proton conductivity of the membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Wen Li,Wen Liu,Wendi Jia,Jin Zhang,Qi Zhang,Zhenguo Zhang,Jialin Zhang,Yunqi Li,Yiyang Liu,Haining Wang,Yan Xiang,Shanfu Lu
The properties of proton conductors determine the operating temperature range of fuel cells. Typically, phosphoric acid (PA) proton conductors exhibit excellent proton conductivity owing to their high proton dissociation and self-diffusion abilities. However, at low temperatures or high current densities, water-induced PA loss causes rapid degradation of cell performance. Maintaining efficient and stable proton conductivity within a flexible temperature range can significantly reduce the start-up temperature of PA-doped proton exchange membrane fuel cells. In this study, a dual-proton conductor composed of an organic phosphonic acid (ethylenediamine tetramethylene phosphonic acid, EDTMPA) and an inorganic PA is developed for proton exchange membranes. The proposed dual-proton conductor can operate within a flexible temperature range of 80–160 °C, benefiting from the strong interaction between EDTMPA and PA, and the enhanced proton dissociation. Fuel cells with the EDTMPA-PA dual-proton conductor showed excellent cell stability at 80 °C. In particular, under the high current density of 1.5 A cm −2 at 160 °C, the voltage decay rate of the fuel cell with the dual-proton conductor is one-thousandth of that of the fuel cell with PA-only proton conductor, indicating excellent stability.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Gaopeng Zhou,Ying Li,Yadan Luo,Xi Wang,Yushi Ding
In this article, the structure and electrical properties of BaSn 0.15 Ce 0.35 Hf 0.25 Y 0.1 Yb 0.1 Ho 0.05 O 3-δ (referred as BSCHYYbHo in forthcoming discuss) high-entropy ceramic have been investigated. The BCHYYb (short for BaCe 0.5 Hf 0.3 Y 0.1 Yb 0.1 O 3-δ ) and BSCHYYbHo pellets were synthesized successfully by the solid-state reaction method. The XRD detection results indicate that there is no secondary phase appeared in BSCHYYbHo and the lattice constant decrease compared to BCHYYb. The surface SEM and EDS images illustrates that BSCHYYbHo is denser than BCHYYb and the elements distribution is more uniform. The DFT calculation proves that BSCHYYbHo has a tend to maintain single phase structure. The electrical properties of BSCHYYbHo is obtained by the DRT analysis and equivalent circuit method based on defect equilibria model. The total conductivity of BSCHYYbHo is about 2.02 × 10 -4 ∼1.01 × 10 -2 S·cm -1 and standard molar hydration enthalpy of BSCHYYbHo is recorded as − 81.8 kJ/mol. Further, the proton, oxygen vacancies and electron holes conductivity activation energies in BSCHYYbHo is estimated to be 0.45 eV, 1.41 eV and 1.60 eV, respectively. Compared to BCHYYb, BSCHYYbHo electrolyte has higher proton concentration and proton transference number. Overall, BSCHYYbHo ceramic with dense structure and high proton transference number is a potential material for application.
研究领域:
材料科学
·
电化学
·
陶瓷
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Pengfei Yang,Hong Wu,Niaz Ali Khan,Benbing Shi,Xueyi He,Li Cao,Xunli Mao,Rui Zhao,Ming Qiu,Zhongyi Jiang
Graphene oxide (GO) membrane, possessing well-aligned laminar interlayer channels and oxygen bearing groups, offers great potentials as proton conductor in fuel cells. Yet, the scarcity and non-uniform distribution of proton conducting sites in the interlayer channels often lead to low conductivity and hinder the use of GO membranes for proton conduction. Single strand deoxyribonucleic acid (ssDNA) molecules bear abundant phosphate and amidogen groups which can act as proton conducting sites. The sequentially arranged phosphate and amidogen groups are in a linear molecule chain, which accords with the ideal arrangement of proton conducting sites. Herein, we intercalated ssDNA into GO interlayer channels via a pre-assembly process to create high-efficient proton conducting channels. GO nanosheets offer well-aligned 2D physical channels and ssDNA provides large amount of sequentially arranged proton conducting sites, which synergistically enhance proton conduction. The DNA@GO-3 membrane shows a proton conductivity of 564.8 mS cm −1 at 80 °C and 98% RH, which is 4.4-fold higher than that of pristine GO membrane and among the highest of the reported GO-based membranes. The H 2 /O 2 single fuel cell performance is improved by nearly 3 folds in terms of maximum power density.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Xuefei Wu,Qingyin Wu
A heteropoly acid (HPA) with Dawson structure, H 6 P 2 W 1 6 Mo 2 O 4 0 ⋅29H 2 O, is synthesized with characterization and the investigation toward its proton conductive behavior. Actually, at 18 ∘ C with 80% relative humidity (RH), H 6 P 2 W 1 6 Mo 2 O 4 0 ⋅ 29H 2 O displays the conductivity as 2.30 × 10 − 3 S ⋅ cm − 1 , indicating an excellent protonic conductor. The proton conduction activation energy is 32.19 kJ ⋅ mol − 1 , implying proton migration following vehicle mechanism. During the measured range, higher temperature can boost the conductivity.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jianjian Yang,Changsong Xie,Qinglei Guo,Hui Wang,Xing Zhou,Zhelun Li,Zixi Kang,Rongming Wang,Daofeng Sun
Proton exchange membrane fuel cells (PEMFCs) are regarded as one of the most promising clean and highly efficient power generation technologies. However, obtaining proton exchange membranes with superior performance remains a challenge for the development of PEMFCs. In this work, we synthesized a porous polyhydroxyl polymer, known as BTA, and successfully introduced almost equimolar phosphate and sulfonic acid groups (−SO3H and −PO4H2) into its framework through the simple postmodification process, resulting in BTA-P and BTA-S, respectively. The studies showed that the −SO3H group in BTA-S can ionize a large number of available protons, and its ion exchange capacity (IEC) reaches 1.65 mmol g–1, which is twice higher than that of BTA-P. The available protons can greatly enhance the proton transport efficiency, resulting in a 3 orders of magnitude increase in proton conductivity of BTA-S compared to BTA-P, reaching up to 3.97 × 10–1 S cm–1 at 80 °C and 95% relative humidity (RH). When a 5% BTA-S/Nafion composite is prepared as a proton exchange membrane for an H2/O2 fuel cell, the maximum power density reaches 952.6 mW cm–2, which is 61.9% higher than that of the recast Nafion membrane at 80 °C and 100% RH. This study reveals that the available proton density plays the most important role in proton conducting polymers.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ruiyi Han,Peiyi Wu
Porous organic cage, a kind of newly emerging soluble crystalline porous material, is introduced to proton-exchange membrane by in situ crystallization. The crystallized Cage 3 with intrinsic water-meditated three-dimensional interconnected proton pathways working together with Nafion matrix generates a composite membrane with highly improved proton conductivity. Different from inorganic crystalline porous materials, like metal–organic frameworks, the organic porous material shows better compatibility with Nafion matrix due to the absence of inorganic elements. In addition, Cage 3 can absorb water up to 20.1 wt %, which effectively facilitates proton conduction under both high- and low-humidity conditions. Meanwhile, the selectivity of Nafion–Cage 3 composite membrane is also elevated upon the loading of Cage 3. The proton conductivity is evidently enhanced without obvious increased methanol permeability. At 90 °C and 95% RH, the proton conductivity of NC3-5 reaches 0.27 S·cm–1, highly improved compared to 0.08 S·cm–1 of recast Nafion under the same condition. This study offers a new strategy for modifying proton-exchange membrane with crystalline porous materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hongsheng Liu,Hengyue Li,Bin Huang,Yange Yang,Haibo Guo,Yan Xiao,Weiguang Yang
To enhance the proton conductivity and durability of Ce-based hybrid proton exchange membranes (PEMs), this study fabricates modified perfluorosulfonic acid (PFSA) hybrid membranes by incorporating the dual-function γ-AlOOH@Ti-supported CeO 2 composite oxide (γ-AlOOH@Ti/CeO 2 ). In addition to combining the inherent proton conductivity of γ-AlOOH with the excellent radical scavenging ability of CeO 2 , both the proton conductivity and durability of Ce-based PEMs are further improved by introducing Ti-dopant, which not only increases hydrogen vacancies on the surface of γ-AlOOH, which facilitate proton conduction, and induces electron transfer from γ-AlOOH@Ti to CeO 2 , which enhance free radical adsorption. As results shown, the proton conductivity and the fluoride release value of the resulting hybrid membrane are about 76 % higher and 35.25 % lower than those of the PFSA-CeO 2 membrane, respectively. Moreover, the performance of cells shows that, after accelerated degradation testing, the PFSA-γ-AlOOH@Ti/CeO 2 membrane exhibits the lowest peak power density decrease rate, the impedance increase rate and hydrogen crossover current density, with 11.79 %, 27.54 % and 3.04 mA cm −2 , respectively. These results suggest that compared to CeO 2 -hybrid PEMs, γ-AlOOH@Ti/CeO 2 -based hybrid PEMs exhibit higher proton conductivity and superior chemical stability, indicating the potential application of γ-AlOOH@Ti/CeO 2 -based hybrid PEMs in proton exchange membrane fuel cells.
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Zhenyu Hu,Li Lin,Yi Jiang,Lianshan Sun,Wanqiang Liu,Qingshuang Wang,Fang Wang
In this work, we have discovered and investigated the reaction mechanism of Aqueous Hydrogen Proton Battery (AHPB), which differ from conventional rocking-chair batteries. The hydrogen protons in the battery reaction is provided by the dissociation of H 2 O molecules in the electrolyte. Thus, the charging and discharging processes of the battery are also accompanied by changes in electrolyte concentration. To explore this, we have designed a AHPBs with a 2 M Zn(ClO 4 ) 2 electrolyte. The experimental results demonstrate excellent performance of the AHPBs, with a discharge specific capacity of up to 700.6 mAh g −1 and a charge-discharge power conversion efficiency of 83.638 %. Both experimental and simulation results confirm that H + in the battery is primarily provided by H 2 O molecules solvating Zn 2+ . As the electrolyte concentration increases, ClO 4 − replaces some of the solvating H 2 O molecules of Zn 2+ , resulting in the remaining unsaturated solvating H 2 O molecules having a stronger propensity for deprotonation, thus facilitating the release of H + . This elucidates the specific source of H + in AHPBs.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4426-4437
·
IF 3.741
Fangyan Cui,Wenyi Wang,Caini Liu,Xingyu Chen,Ning Li
Summary One-dimensional (1D) sodium ligninsulfonate functionalized carbon nanotubes (SCNT), two-dimensional (2D) graphene oxide (GO), and three-dimensional (3D) zirconium-based metal-organic frameworks (UiO-66) are self-assembled as filler materials for proton-exchange membranes (PEMs) because of their potential for extending proton transport pathways. Herein, UiO-66-SCNT and UiO-66-SCNT@GO were prepared by a facile solvothermal synthesis and then the nanohybrid chitosan (CS) PEMs were fabricated via solution casting. The hybrid PEMs with higher ion exchange capacity than the pure CS membrane displayed higher proton conductivity and selectivity. The proton conductivity of nanohybrid membrane doped with 7 wt% UiO-66-SCNT@GO (CS/U-S@GO-7) was enhanced to 64 mS cm −1 at 70°C. Simultaneously, the selectivity was reached 19.4 × 10 4 S s cm −3 and was much higher than the pristine CS membrane (0.13 × 10 3 S s cm −3 ). Moreover, the mechanical properties of all composite membranes were significantly enhanced compared with that of the pure CS membrane. The results showed that our research provided a valuable strategy for designing high-performance CS-based PEMs in direct methanol fuel cell (DMFC). Highlights A simple and facile solvothermal synthesis was used to prepare UiO-66-SCNT@GO. UiO-66-SCNT@GO was introduced into chitosan (CS) matrix to optimize proton transport channels. CS-based hybrid membranes exhibit high proton conductivity and selectivity. CS-based hybrid membranes show low methanol permeability.
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
危险品化学品经营许可证（带存储）