Base-acid doped polybenzimidazole with high phosphoric acid retention for HT-PEMFC applications

Chen, Hao; Wang, Shuang; Li, Fengxiang; Wang, Di; Li, Jinsheng; Mao, Tiejun; Li, Geng; Wang, Xu; Xu, Jingmei; Wang, Zhe

doi:10.1016/j.memsci.2019.117722

Cited by 93 publications

(48 citation statements)

References 39 publications

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“…Figure 3a shows that 𝜎 𝑚𝑒𝑚 and 𝑈 𝑐𝑒𝑙𝑙 achieve the maximum value when 𝐷𝐿 = 8.4. A higher degree of phosphoric acid doping is beneficial to improve the HT-PEMFC performance, but too high 𝐷𝐿 also results in a poorer mechanical property and makes phosphoric acid molecules more easily to leak out of the HT-PEMFC [71]. As the temperature increases, both 𝜎 𝑚𝑒𝑚 and 𝑈 𝑐𝑒𝑙𝑙 increase.…”

Section: Ht-pemfc Stackmentioning

confidence: 99%

Thermodynamic Modeling and Performance Analysis of Vehicular High-Temperature Proton Exchange Membrane Fuel Cell System

et al. 2022

Membranes

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Since the high temperature proton exchange membrane fuel cells (HT-PEMFC) stack require a range of auxiliary equipments to maintain operating conditions, it is necessary to consider operation of related components in the design of HT-PEMFC systems. In this paper, a thermodynamic model of a vehicular HT-PEMFC system using phosphoric acid doped polybenzimidazole membrane is developed. The power distribution and exergy loss of each component are derived according to thermodynamic analysis, where the stack and heat exchanger are the two components with the greatest exergy loss. In addition, ecological functions and improvement potentials are proposed to evaluate the system performance better. On this basis, the effects of stack inlet temperature, pressure, and stoichiometric on system performance are analyzed. The results showed that the energy efficiency, exergy efficiency and net output power of the system achieved the maximum when the inlet gases temperature is 406.1 K. The system performance is better when the cathode inlet pressure is relatively low and the anode inlet pressure is relatively high. Moreover, the stoichiometry should be reduced to improve the system output performance on the basis of ensuring sufficient gases reaction in the stack.

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Section: Ht-pemfc Stackmentioning

confidence: 99%

Thermodynamic Modeling and Performance Analysis of Vehicular High-Temperature Proton Exchange Membrane Fuel Cell System

et al. 2022

Membranes

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“…The HT‐PEMFC, operating temperature at 120°C~200°C, has a high CO tolerance level 10 and electrochemical reaction rate 11 . Furthermore, the HT‐PEMFC has a simple heat and water management systems because water generated is gaseous at its relatively high temperature 12 . Development of suitable proton‐conducting materials to adapt the higher operating temperature is essential.…”

Section: Introductionmentioning

confidence: 99%

“…11 Furthermore, the HT-PEMFC has a simple heat and water management systems because water generated is gaseous at its relatively high temperature. 12 Development of suitable proton-conducting materials to adapt the higher operating temperature is essential. Phosphoric acid (PA) is a conductive material that has high inherent proton conductivity at relatively high temperature.…”

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confidence: 99%

A novel triple‐cycle system based on high‐temperature proton exchange membrane fuel cell, thermoelectric generator, and thermally regenerative electrochemical refrigerator for power and cooling cogeneration

Guo

Zhang

Guo

et al. 2022

Intl J of Energy Research

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Summary To effectively utilize the exhaust heat of high‐temperature proton exchange membrane fuel cells (HT‐PEMFCs) for cooling, a novel triple‐cycle system model mainly including a HT‐PEMFC, thermoelectric generator (TEG), and thermally regenerative electrochemical refrigerator (TRER) is theoretically formulated. The TEG activated by the HT‐PEMFC exhaust heat is used to drive the TRER for cooling. Considering irreversible losses in the HT‐PEMFC, TEG, and TRER and among these subsystems, mathematical formulas of the energetic and exergetic performance indexes are obtained. Calculation results show that compared with a sole HT‐PEMFC system, the equivalent power density, energetic efficiency, and exergetic efficiency for the triple‐cycle system increase by 16.0%, 12.6%, and 12.7%, respectively. The exergy destruction rate density reduces by 1.0%. Finally, sensitivity analysis of seven key parameters is conducted. This study can provide a valuable guide for the design of actual triple‐cycle systems based on HT‐PEMFCs for power and cooling cogeneration.

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“…4,5 Therefore, there has being the challenges to design and prepare PEMs with the outstanding properties operating at a range of 100-200 C without humidification. [6][7][8] For the preparation of high temperature proton exchange membranes (HTPEMs), the intensive researches focused on introducing the anhydrous proton conduction carriers into functional polymers, such as polybenzimidazole (PBI) 9 and functional groups modifying PBI, 10,11 poly(2,5-benzimidazole) (abPBI), 12 sulfonated PBI, 13 Nafion, 14 poly(ether sulfone benzotriazole) (PESB), 15 polysulfone (PSF), 16 polyethersulfone (PES), 17 sulfonated poly(ether ether ketone) (SPEEK), 18,19 sulfonated polyimide (SPI), 20 sulfonated poly(imide-benzimidazole) (SPIBI), 21 polyvinylidene fluoride (PVDF), 22 polyvinyl chloride (PVC), 23 and blend polymers. 24,25 Among the reported results, PAdoped PBI-based membranes with inspired results were thus regarded as the most promising candidate as HTPEMs.…”

Section: Introductionmentioning

confidence: 99%

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

et al. 2020

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Freeze-drying (fd) technique is an effective and facile method to accumulate nanofibers for membrane preparation, and it has been frequently reported in the development of energy materials. Kevlar as amide nanofibers (ANFs) could serve as support materials for proton exchange membranes (PEMs) owing to the merits of exceptional stiffness and strength, etc. The aim of this research is to enhance the proton conductivity of phosphoric acid (PA)-doped Kevlar membranes by incorporating polyacrylamide (PAM) and 1-butyl-3-methylimidazolium chloride (bmimCl) with freeze-drying technique. The components of PAM and bmimCl could provide the binding sites to combine PA molecules with the formation of Kevlar/PAM/bmimCl/PA membranes. Furthermore, the prepared membranes with the freeze-drying posttreatment are substantially more effective at enhancing proton conductivity owing to the combination of more PA molecules. Specifically, Kevlar/PAM/bmimCl(fd)/PA membranes showed the anhydrous proton conductivity of 2.64 × 10 −1 S/cm at 180 C and 1.04 × 10 −1 S/cm at 140 C in a 270-hour non-stop test. As regard to the prepared PA-doped Kevlar/CdTe-based membranes, the mechanical strength was far from what was expected. Comparing to the solution casting method, the freeze-drying technique was a feasible strategy to deal with ANFs for exploiting high-temperature PEMs with high performance.

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Base-acid doped polybenzimidazole with high phosphoric acid retention for HT-PEMFC applications

Cited by 93 publications

References 39 publications

Thermodynamic Modeling and Performance Analysis of Vehicular High-Temperature Proton Exchange Membrane Fuel Cell System

Thermodynamic Modeling and Performance Analysis of Vehicular High-Temperature Proton Exchange Membrane Fuel Cell System

A novel triple‐cycle system based on high‐temperature proton exchange membrane fuel cell, thermoelectric generator, and thermally regenerative electrochemical refrigerator for power and cooling cogeneration

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

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