scholarly journals Phosphoric Acid Doped Polybenzimidazole (PBI)/Zeolitic Imidazolate Framework Composite Membranes with Significantly Enhanced Proton Conductivity under Low Humidity Conditions

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 775 ◽  
Author(s):  
Jorge Escorihuela ◽  
Óscar Sahuquillo ◽  
Abel García-Bernabé ◽  
Enrique Giménez ◽  
Vicente Compañ
Keyword(s):  
Binary Mixture ◽  
Synergistic Effect ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Proton Transport ◽  
Composite Membranes ◽  
Zeolitic Imidazolate Framework ◽  
Low Humidity

The preparation and characterization of composite polybenzimidazole (PBI) membranes containing zeolitic imidazolate framework 8 (ZIF-8) and zeolitic imidazolate framework 67 (ZIF-67) is reported. The phosphoric acid doped composite membranes display proton conductivity values that increase with increasing temperatures, maintaining their conductivity under anhydrous conditions. The addition of ZIF to the polymeric matrix enhances proton transport relative to the values observed for PBI and ZIFs alone. For example, the proton conductivity of PBI@ZIF-8 reaches 3.1 × 10−3 S·cm−1 at 200 °C and higher values were obtained for PBI@ZIF-67 membranes, with proton conductivities up to 4.1 × 10−2 S·cm−1. Interestingly, a composite membrane containing a 5 wt.% binary mixture of ZIF-8 and ZIF-67 yielded a proton conductivity of 9.2 × 10−2 S·cm−1, showing a synergistic effect on the proton conductivity.

Preparation of Novel Polyaniline and Phosphoric Acid Doped Sulfonated Polybenzimidazole Composite Membranes for Fuel Cells

2014 ◽  
Vol 584-586 ◽  
pp. 1669-1672
Author(s):  
Yong Ming Zhang ◽  
Jing Zou ◽  
Lei Wang ◽  
Han Chen ◽  
Jie Si
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Composite Membrane ◽  
Proton Exchange Membrane ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Synthesis And Characterization ◽  
Sulfonated Polybenzimidazole ◽  
Exchange Membrane

Polyaniline (PANI) and phosphoric acid (PA) doped sulfonated polybenzimidazole (SPBI) composite membrane was prepared for application in high-temperature proton exchange membrane (PEMFC) without the need of humidification. The synthesis and characterization of targed composite membrane were introduced in this paper.

scholarly journals PEMBUATAN DAN KARAKTERISASI MEMBRAN KOMPOSIT KITOSAN-SODIUM ALGINAT TERFOSFORILASI SEBAGAI PROTON EXCHANGE MEMBRANE FUEL CELL (PEMFC)

2016 ◽  
Vol 1 (1) ◽  
pp. 14
Author(s):  
Siti Wafiroh ◽  
Suyanto Suyanto ◽  
Yuliana Yuliana
Keyword(s):  
Fuel Cell ◽  
Sodium Alginate ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Water Swelling ◽  
Exchange Membrane

AbstrakDi era globalisasi ini, kebutuhan bahan bakar fosil semakin meningkat dan ketersediannya semakin menipis. Oleh karena itu, dibutuhkan bahan bakar alternatif seperti Proton Exchange Membrane Fuel Cell (PEMFC). Tujuan dari penelitian ini adalah membuat dan mengkarakterisasi membran komposit kitosan-sodium alginat dari rumput laut coklat (Sargassum sp.) terfosforilasi sebagai Proton Exchange Membrane Fuel Cell (PEMFC). PEM dibuat dengan 4 variasi perbandingan konsentrasi antara kitosan dengan sodium alginat 8:0, 8:1, 8:2, dan 8:4 (b/b). Membran komposit kitosan-sodium alginat difosforilasi dengan STPP 2N. Karakterisasi PEM meliputi: uji tarik, swelling air, kapasitas penukar ion, FTIR, SEM, permeabilitas metanol, dan konduktivitas proton. Berdasarkan hasil analisis tersebut, membran yang optimal adalah perbandingan 8:1 (b/b) dengan nilai modulus young sebesar 0,0901 kN/cm2, swelling air sebesar 19,14 %, permeabilitas metanol sebesar 72,7 x 10-7, dan konduktivitas proton sebesar 4,7 x 10-5 S/cm. Membran komposit kitosan-sodium alginat terfosforilasi memiliki kemampuan yang cukup baik untuk bisa diaplikasikan sebagai membran polimer elektrolit dalam PEMFC. Kata kunci: kitosan, sodium alginat, terfosforilasi, PEMFC  AbstractIn this globalization era, the needs of fossil fuel certainly increases, but its providence decreases. Therefore, we need alternative fuels such as Proton Exchange Membrane Fuel Cell (PEMFC). The purpose of this study is preparationand characterization of phosphorylated chitosan-sodium alginate composite membrane from brown seaweed (Sargassum sp.) as Proton Exchange Membrane Fuel Cell (PEMFC). PEM is produced with 4 variations of concentration ratio between chitosan and sodium alginate 8:0, 8:1, 8:2, and 8:4 (w/w). Chitosan-sodium alginate composite membrane phosphorylated with 2 N STPP. The characterization of PEM include: tensile test, water swelling, ion exchange capacity, FTIR, SEM, methanol permeability, and proton conductivity. Based on the analysis result, the optimal membrane is ratio of 8:1 (w/w) with the value of Young’s modulus about 0.0901 kN/cm2, water swelling at 19.14%, methanol permeability about 72.7 x 10-7, and proton conductivity about 4.7 x 10-5 S/cm. The phosphorylated chitosan-sodium alginate composite membrane has good potentials for the application of the polymer electrolyte membrane in PEMFC. Keywords: chitosan, sodium alginate, phosphorylated, PEMFC

Proton conductivity of poly(dialkyl)phosphazenes–phosphoric acid composites at low humidity

2007 ◽  
Vol 178 (25-26) ◽  
pp. 1442-1450 ◽  
Author(s):  
G DOTELLI ◽  
M GALLAZZI ◽  
M BAGATTI ◽  
E MONTONERI ◽  
V BOFFA
Keyword(s):  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Low Humidity

Facile Preparation of Well-Dispersed GO-SPEEK Composite Membranes by Electrospun for Fuel Cell Applications

2015 ◽  
Vol 1735 ◽  
Author(s):  
Xu Liu ◽  
Xiaoyu Meng ◽  
Chuanming Shi ◽  
Jiangbei Huo ◽  
Ziqing Cai ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Electrospinning Technique ◽  
Fuel Cell Application ◽  
High Proton ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol

ABSTRACTGraphene oxide (GO) is one of the most attractive inorganic nanofillers in proton exchange membranes (PEMs) for its large specific surface area and high proton conductivity. The proton conductivity of GO nanosheet is known to be orders of magnitude greater than the bulk GO, thus it is essential to improve the dispersion of GO nanosheets in the PEM matrix to achieve higher conductivity. In this study, we report a facile and effective method to fabricate a GO/sulfonated poly ether ether ketone (SPEEK) composite membrane with well-dispersed GO nanosheets in SPEEK matrix by using electrospinning technique for direct methanol fuel cell application. The composite membrane exhibits improved proton conductivity, dimensional stability and methanol barrier property due to the presence of well-dispersed GOs. It is believed that the GO nanosheets can not only induce continuous channels for proton-conducting via Grotthuss mechanism, but also act as methanol barriers to hinder the methanol molecules from passing through the membrane.

Nafion – Azole Composite Membranes for High Temperature PEMFC

2014 ◽  
Vol 783-786 ◽  
pp. 1692-1697
Author(s):  
Je Deok Kim ◽  
Mun Suk Jun
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Temperature ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Room Temperature ◽  
Composite Membranes ◽  
Thermal And Mechanical Properties ◽  
High Proton Conductivity ◽  
High Proton

Nafion-azole (benzimidazole, 1,2,4-triazole, 1,2,3-triazole) composite membranes were prepared by room temperature and autoclave solution processing for high temperature (above 100 °C) PEMFC. Among the various Nafion – azole composite membranes, Nafion – 1,2,3-triazole membrane showed excellent flexibility, thermal stability, and homogeneous structure. Nafion – 1,2,4-triazole composite membrane had high thermal and mechanical properties, and also showed high proton conductivity of 0.02 S/cm at the temperature of 160 °C under dry (N2) condition.

scholarly journals Ionic Liquid Composite Polybenzimidazol Membranes for High Temperature PEMFC Applications

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 732 ◽  
Author(s):  
Jorge Escorihuela ◽  
Abel García-Bernabé ◽  
Álvaro Montero ◽  
Óscar Sahuquillo ◽  
Enrique Giménez ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Electrochemical Impedance ◽  
Low Cost ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Polymeric Matrix ◽  
Conductivity Enhancement ◽  
Hydrogen Bond Networks

A series of proton exchange membranes based on polybenzimidazole (PBI) were prepared using the low cost ionic liquids (ILs) derived from 1-butyl-3-methylimidazolium (BMIM) bearing different anions as conductive fillers in the polymeric matrix with the aim of enhancing the proton conductivity of PBI membranes. The composite membranes prepared by casting method (containing 5 wt. % of IL) exhibited good thermal, dimensional, mechanical, and oxidative stability for fuel cell applications. The effects of anion, temperature on the proton conductivity of phosphoric acid-doped membranes were systematically investigated by electrochemical impedance spectroscopy. The PBI composite membranes containing 1-butyl-3-methylimidazolium-derived ionic liquids exhibited high proton conductivity of 0.098 S·cm−1 at 120 °C when tetrafluoroborate anion was present in the polymeric matrix. This conductivity enhancement might be attributed to the formed hydrogen-bond networks between the IL molecules and the phosphoric acid molecules distributed along the polymeric matrix.

Mesoporous titania-embedded polyacrylonitrile composite nanofibrous membrane for particulate matter filtration

2019 ◽  
pp. 089270571985992
Author(s):  
P Reena ◽  
N Gobi ◽  
P Chitralekha ◽  
D Thenmuhil ◽  
V Kamaraj
Keyword(s):  
Particulate Matter ◽  
Composite Membrane ◽  
Weight Ratio ◽  
Composite Membranes ◽  
Areal Density ◽  
Mesoporous Titania ◽  
High Porosity ◽  
Homogenous Distribution

In the present work, mesoporous titania (MT)-embedded polyacrylonitrile (PAN) nanofibrous membranes have been developed and studied for their efficiency in particulate matter (PM) filtration. Using Box–Behnken method, 15 nanofibrous composite membranes were obtained through electrospinning by choosing three different process variables, such as MT (weight ratio), areal density (g m−2), and spinning time (h). The characterization of resulted nanofibrous composite membranes revealed that the homogenous distribution of MT (2.9 nm) within the PAN delivers high porosity as well as air permeability. Further, filtration efficiency (FE) was also analyzed for PM from 0.3 µm to 3 µm. PM filtration studies suggested that the nanofibrous composite membrane developed from 15% MT, spin time of 2 h, and areal density of 80 g m−2 possesses overall efficiency of 96.4%, without pressure drop for the composite. The results suggest that the role of MT was found to be significant in achieving successful filtration of PM. In addition to successful FE, the desirability value of the developed composite was also calculated statistically and the optimized composite membrane was identified.

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