Toward Improved Alkaline Membrane Fuel Cell Performance Using Quaternized Aryl-Ether Free Polyaromatics

Maurya, Sandip; Fujimoto, Cy; Hibbs, Michael; Villarrubia, Claudia Narváez; Kim, Yu Seung

doi:10.1021/acs.chemmater.8b00358

Cited by 90 publications

(80 citation statements)

References 34 publications

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“…S27). 6,33 We also demonstrated that the fuel cells with PX75-T50 give high performance with more economical silver catalysts. Ag/C, 0.5 mg Au cm −2 , on cathode resulted in 0.47 W cm −2 peak power density, with Pt-Ru/C for the anode and the high flow rate.…”

Section: Fuel Cell Performancementioning

confidence: 74%

“…5a), which is comparable to benchmark systems at the same working conditions. 6,11,40 Changing the anode catalyst to Pt-Ru/C (0.5 mg Pt cm −2 and 0.25 mg Ru cm −2 ) increased the peak power density to 0.45 W cm −1 . Increasing gas flow rate to 1.0 L min −1 for both gases, while keeping Pt-Ru/C for the anode, further increased the peak power density to 0.73 W cm −2 .…”

Section: Fuel Cell Performancementioning

confidence: 99%

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Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells

et al. 2019

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Section: Fuel Cell Performancementioning

confidence: 74%

Section: Fuel Cell Performancementioning

confidence: 99%

Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells

et al. 2019

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“…In the initial 14 days, the ionic conductivity of all the prepared membranes increased slightly, which might be due to the slight increase of alkali doping contents in the membranes caused by the slight decrease of molecular weight of the polymers in alkali solution. The results are consistent with the literature . The membranes maintained the ionic conductivity from 14 to 30 days and then showed a slightly decreased conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…The results are consistent with the literature. 51 The membranes maintained the ionic conductivity from 14 to 30 days and then showed a slightly decreased conductivity. When the OPBI membrane was immersed in alkali solution for more than 30 days, the ionic conductivity decreased sharply due to the degradation of the membrane, and after 42 days, the membrane broke and the ionic conductivity could not be measured.…”

Section: Alkaline Stabilitymentioning

confidence: 89%

Alkali‐doped hyperbranched cross‐linked polybenzimidazoles containing benzyltrimethyl ammoniums with improved ionic conductivity as alkaline direct methanol fuel cell membranes

Gao

Fang

et al. 2020

Int J Energy Res

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Summary Development of anion exchange membranes (AEMs) with good performance, such as high conductivity, good alkaline stability and mechanical strength, has been a hot topic for the fuel cell application. Here, a novel kind of hyperbranched cross‐linker decorated with quaternary ammonium groups was introduced to polybenzimidazole (PBI) membranes and QOPBI‐x membranes (where x is the weight ratio of the hyperbranched cross‐linker). Compared with the linear OPBI membrane (0.091 S cm−1), QOPBI‐x membranes displayed an improved ionic conductivity (up to 0.122 S cm−1) at 60°C after they were doped in 6 M KOH for 7 days. The KOH‐doped QOPBI‐x membranes also exhibited a high tensile strength (54.5‐61.7 MPa) and superior alkaline stability. There is almost no decline in the ionic conductivity after being immersed in a 6 M KOH solution for 30 days. In addition, the alkaline direct methanol fuel cell (ADMFC) performance based on the KOH‐doped OPBI and QOPBI‐x membranes is described. The QOPBI‐15 membrane displayed good performance (75.6 mW cm−2), which is 33.3% higher than the OPBI membrane (56.7 mW cm−2).

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“…Maurya et al characterized non-Pt HOR catalysts with different surface adsorption properties using rotating disk electrode measurements, density functional theory calculations, and fuel cell performance tests [ 23 ]. Kim et al studied the effects of introducing a benzyltrimethylammonium hydroxide side chain into aryl-ether-free polyphenylene and the alkyl chain of its main chain on phenyl adsorption to Pt-based HOR catalysts [ 24 ]. Their results showed that AEMFC performance can be enhanced through the use of ionomers with fewer phenyl moieties or with phenyl moieties located near bulky cationic functional groups.…”

Section: Introductionmentioning

confidence: 99%

Polystyrene-Based Hydroxide-Ion-Conducting Ionomer: Binder Characteristics and Performance in Anion-Exchange Membrane Fuel Cells

et al. 2021

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Polystyrene-based polymers with variable molecular weights are prepared by radical polymerization of styrene. Polystyrene is grafted with bromo-alkyl chains of different lengths through Friedel–Crafts acylation and quaternized to afford a series of hydroxide-ion-conducting ionomers for the catalyst binder for the membrane electrode assembly in anion-exchange membrane fuel cells (AEMFCs). Structural analyses reveal that the molecular weight of the polystyrene backbone ranges from 10,000 to 63,000 g mol−1, while the ion exchange capacity of quaternary-ammonium-group-bearing ionomers ranges from 1.44 to 1.74 mmol g−1. The performance of AEMFCs constructed using the prepared electrode ionomers is affected by several ionomer properties, and a maximal power density of 407 mW cm−2 and a durability exceeding that of a reference cell with a commercially available ionomer are achieved under optimal conditions. Thus, the developed approach is concluded to be well suited for the fabrication of next-generation electrode ionomers for high-performance AEMFCs.

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Toward Improved Alkaline Membrane Fuel Cell Performance Using Quaternized Aryl-Ether Free Polyaromatics

Cited by 90 publications

References 34 publications

Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells

Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells

Alkali‐doped hyperbranched cross‐linked polybenzimidazoles containing benzyltrimethyl ammoniums with improved ionic conductivity as alkaline direct methanol fuel cell membranes

Polystyrene-Based Hydroxide-Ion-Conducting Ionomer: Binder Characteristics and Performance in Anion-Exchange Membrane Fuel Cells

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