scholarly journals Investigation of phosphoric acid and water transport in the high temperature proton exchange membrane fuel cells

2021 ◽  
Author(s):  
Mu Sun ◽  
Jicai Huang ◽  
Zhangxun Xia ◽  
Suli Wang ◽  
Gongquan Sun
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Liquid Phase ◽  
Phosphoric Acid ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Catalyst Layer ◽  
Proton Exchange ◽  
Phase Fraction ◽  
Exchange Membrane

A three-dimensional, non-isothermal and multiphase model of high temperature proton exchange membrane fuel cells is built to investigate water and phosphoric acid transportation, in which a spherical agglomerate model considering catalyst layer structure and liquid phase fraction is applied to determine the electrochemical kinetics in the cathode catalyst layer. Experimental polarization curve, water proportion in the anode outlet gas and phosphoric acid distribution are selected for validation. It is found that the simulated results can represent the experimental data with reasonable accuracy. Based on the model, the effects of current density and stoichiometry on the variable distributions are analyzed. The results show that water in anode is mainly from cathode by concentration diffusion of liquid water. A higher current density leads to a greater electro-migration of phosphoric acid from cathode to anode and a higher liquid phase fraction in anode,while a lower phosphoric acid concentration in the fuel cells.

Phosphoric acid doped imidazolium polysulfone membranes for high temperature proton exchange membrane fuel cells

2012 ◽  
Vol 205 ◽  
pp. 114-121 ◽  
Author(s):  
Jingshuai Yang ◽  
Qingfeng Li ◽  
Jens Oluf Jensen ◽  
Chao Pan ◽  
Lars N. Cleemann ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Exchange Membrane ◽  
Polysulfone Membranes

scholarly journals 3D Network Structural Poly (Aryl Ether Ketone)-Polybenzimidazole Polymer for High-Temperature Proton Exchange Membrane Fuel Cells

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Junqiao Jiang ◽  
Erli Qu ◽  
Min Xiao ◽  
Dongmei Han ◽  
Shuanjin Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Aryl Ether ◽  
3D Network ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Exchange Membrane

Poor mechanical property is a critical problem for phosphoric acid-doped high-temperature proton exchange membranes (HT-PEMs). In order to address this concern, in this work, a 3D network structural poly (aryl ether ketone)-polybenzimidazole (PAEK-cr-PBI) polymer electrolyte membrane was successfully synthesized through crosslinking reaction between poly (aryl ether ketone) with the pendant carboxyl group (PAEK-COOH) and amino-terminated polybenzimidazole (PBI-4NH2). PAEK-COOH with a poly (aryl ether ketone) backbone endows superior thermal, mechanical, and chemical stability, while PBI-4NH2 serves as both a proton conductor and a crosslinker with basic imidazole groups to absorb phosphoric acid. Moreover, the composite membrane of PAEK-cr-PBI blended with linear PBI (PAEK-cr-PBI@PBI) was also prepared. Both membranes with a proper phosphoric acid (PA) uptake exhibit an excellent proton conductivity of around 50 mS cm-1 at 170°C, which is comparable to that of the well-documented PA-doped PBI membrane. Furthermore, the PA-doped PAEK-cr-PBI membrane shows superior mechanical properties of 17 MPa compared with common PA-doped PBI. Based upon these encouraging results, the as-synthesized PAEK-cr-PBI gives a highly practical promise for its application in high-temperature proton exchange membrane fuel cells (HT-PEMFCs).

Dimensionally-stable phosphoric acid–doped polybenzimidazoles for high-temperature proton exchange membrane fuel cells

2016 ◽  
Vol 336 ◽  
pp. 391-400 ◽  
Author(s):  
Xiaobai Li ◽  
Hongwei Ma ◽  
Yanchao Shen ◽  
Wei Hu ◽  
Zhenhua Jiang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Exchange Membrane
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