Influence of Ionomer/Carbon Ratio on the Performance of a Polymer Electrolyte Fuel Cell

Eguchi, Mika; Baba, Koki; Onuma, Takamitsu; Kazuma, Yoshida; Iwasawa, Kenta; Kobayashi, Yoshio; Uno, Katsuhiro; Komatsu, Keishiro; Kobori, Maya; Nishitani‐Gamo, Mikka; Ando, Toshihiro

doi:10.3390/polym4041645

Cited by 41 publications

(34 citation statements)

References 13 publications

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“…With insufficient ionomer, the proton conduction and electrochemical performance are decreased. On the other hand, excess ionomer causes water flooding and reduces the ECSA, resulting in electrochemical performance drop . In addition, the ionomer distribution on the Pt/C surface is an important factor in reducing the amount of catalyst used in the electrodes and improving the cell performance , .…”

Section: Introductionmentioning

confidence: 99%

Effects of Ionomer Carbon Ratio and Ionomer Dispersity on the Performance and Durability of MEAs

Lee

Yim

et al. 2018

Fuel Cells

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Membrane‐electrode assemblies (MEAs) are fabricated using different catalysts and ionomers, in order to investigate the effects of these factors on the performance and stability of the polymer electrolyte membrane fuel cell (PEMFC). Platinum catalysts with different degrees of graphitization in the carbon support (less graphitized: Tanaka, more graphitized: RTX) are used. Perfluorosulfonic acid polymer‐based ionomers with water‐based or organic solvent‐based solvents are also prepared as binders for the electrode. The optimum composition of catalyst and ionomer is identified based on the results of cyclic voltammetry, electrochemical impedance spectroscopy, single cell performance, and long‐term durability tests. Tanaka catalyst and water‐based ionomer show the best performance and durability. In addition, the ionomer to carbon (I/C) weight ratio affects the fuel cell performance, and the optimum value is I/C = 1 for both water‐based and organic solvent‐based ionomers.

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Section: Introductionmentioning

confidence: 99%

Effects of Ionomer Carbon Ratio and Ionomer Dispersity on the Performance and Durability of MEAs

Lee

Yim

et al. 2018

Fuel Cells

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“…Table shows that catalysts are usually only used at one concentration, such as 60 wt.%, 40 wt.% or 20 wt.%. However, it is hypothesized that the optimal Nafion content may depend on the Pt concentration, but this has not been widely studied, whereas only a few works have been studied particularly for Nafion‐carbon ratio .This work aims to investigate how the Pt concentration affects the Nafion content by using the same Pt loading and fabrication method. The images of catalyst layers of MEAs from different Pt concentrations are also examined.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Nafion with Various Pt–C Concentrations in Membrane Electrode Assemblies for PEMFCs

et al. 2017

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Membrane electrode assemblies (MEAs) were fabricated directly onto the electrolyte membrane, using an ultrasonic spraying technique. Pt–C catalysts, with concentrations of 10%, 20% and 40% by weight, were used, and the Pt loading onto the MEAs was kept constant at 0.3 mg cm−2. Nafion contents were considered from 15% to 35 wt.%. The morphologies of the MEAs were evaluated by scanning electron microscopy (SEM), in which the agglomeration of Pt–C particles was imaged, and a secondary pore in the catalyst layers (CLs) was revealed. The cross‐section images showed that the thickness of the CLs depended on the Pt–C concentration. The electrochemical surface area (ECSA) of those Pt–C concentrations and various compositions of Nafion contents were examined by cyclic voltammetry. Polarization curves were also measured and showed that the Nafion contents of 25 wt.%, 20 wt.%, and 15 wt.% gave the best performance for 10 wt.%, 20 wt.%, and 40 wt.% Pt–C catalysts, respectively. This indicates the Pt concentration is dependent on the Nafion content; the greater the weight of platinum in the catalysts, the less Nafion ionomer is required to optimize the electrochemical reaction. The data shows the same results regardless of the MEA fabrication techniques, operating conditions and Pt loadings.

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“…[4,5] In addition, the application of marimo carbon may include airplane, electrodes, automobile components, solar cells, and fuel cells. [6,7] Conventionally, Marimo carbon is synthesized by mean of chemical vapor deposition (CVD) using a fixed-bed reactor. Fixed-bed CVD is the most popular method for the synthesis of CNTs.…”

Section: Introductionmentioning

confidence: 99%

Selective synthesis of marimo carbon using Fluidized-Bed chemical vapor deposition

Kin

Nakagawa

Oda

et al. 2016

Trans. Mat. Res. Soc. Japan

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Marimo carbon is a fibrous carbon material that has attracted attention in many fields, such as for its use in electronic devices and capacitors. It has diamond particles in its core, with carbon nanofilaments radiating outward from diamond core. In this study, we synthesized marimo carbon using an oxidized diamond-supported catalyst by fluidized bed chemical vapor deposition (CVD) and rotary fluidized bed CVD. This demonstrated that fluidized bed technology can be used for the cost-efficient, large-scale production of uniform marimo carbon.

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Influence of Ionomer/Carbon Ratio on the Performance of a Polymer Electrolyte Fuel Cell

Cited by 41 publications

References 13 publications

Effects of Ionomer Carbon Ratio and Ionomer Dispersity on the Performance and Durability of MEAs

Effects of Ionomer Carbon Ratio and Ionomer Dispersity on the Performance and Durability of MEAs

Evaluation of Nafion with Various Pt–C Concentrations in Membrane Electrode Assemblies for PEMFCs

Selective synthesis of marimo carbon using Fluidized-Bed chemical vapor deposition

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