Effects of hot pressing conditions on the performances of MEAs for direct methanol fuel cells

Zhang, Jian; Yin, Geping; Wang, Zhen‐Bo; Lai, Qinzhi; Cai, Kedi

doi:10.1016/j.jpowsour.2006.12.039

Cited by 60 publications

(36 citation statements)

References 20 publications

(25 reference statements)

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“…The fuel was 1 M methanol at 2 mL min -1 , air at 350 sccm and Nafion-117 as membrane. Zhang et al [38]. reported a maximal power density of 46 mW cm -2 at 80°C using a 40 wt% Pt-Ru/C anode catalyst and a 40 wt% Pt/C cathode catalyst and a total metal loading of 2.5 mg cm -2 in each electrode.…”

Section: Original Research Papermentioning

confidence: 99%

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

et al. 2011

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Nano‐sized Pt colloids were prepared using the polyol method and supported on Ketjen black EC 600J (KB), Vulcan XC‐72 (VC) and high surface area graphite 300 (HG). The effects of the Nafion ionomer content, and the Pt loading of the cathode catalyst layer as well as the Pt loading on the support on the performance of direct methanol fuel cells (DMFCs), were studied. The membrane electrode assemblies (MEAs) were analysed using current–voltage curves, cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and adsorbed CO stripping voltammetry. Optimum Nafion to carbon (N/C) ratios (N/C being defined as the weight ratio of the Nafion ionomer to the carbon) were determined. The optimum N/C ratios were found to depend on the support as follows, 1.4, 0.7 and 0.5 for Pt/KB, Pt/VC and Pt/HG, respectively and to be independent of the Pt/C loading range of 20–80 wt% tested in this work. The highest DMFC performances, as well as the highest electrochemical active surface areas, and improved gas diffusivities, were achieved using these ratios. For the catalysts prepared in this work, the average Pt crystallite size was found to decrease with increasing surface area of the support for a particular Pt loading. MEAs made using KB as support and the optimal N/C ratio of 1.4 showed the best performances, i.e. higher than the VC and HG supports for any N/C ratio. The highest DMFC performance was observed using 60 wt% Pt on KB cathode electrodes of 1 mg Pt cm–2 loading and an N/C value of 1.4. For all three supports studied, the 60 wt% Pt on carbon loading resulted in the best DMFC performance. This may be linked to the Pt particle size and catalyst preparation method used in this work. In comparison to literature results, high DMFC performances were achieved using relatively ‘low' Pt and Ru loadings. For example, a maximum power density of >100 mW cm–2 at 60 °C was observed using a 1 mg Pt cm–2 cathode loading and a 2 mg PtRu cm–2 anode loading.

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Section: Original Research Papermentioning

confidence: 99%

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

et al. 2011

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“…The optimized parameters for temperature, pressures and time are 135℃, 80kgf/cm 2 and 90s, respectively. The highest power density of MEA is attributed to the lowest contact resistance between the membrane and CL (Zhang et al, 2007). In addition, Therdthianwong et al tried to find systematically the most significant hot-pressing parameter by designing a full factorial analysis of the three main hot-pressing parameters related to the cell performance (Therdthianwong et al, 2007).…”

Section: Catalyst Coated On Electrode Methods (Cce)mentioning

confidence: 99%

High Performance Membrane Electrode Assemblies by Optimization of Processes and Supported Catalysts

Pak¹,

You²,

Choi³

et al. 2012

Hydrogen Energy - Challenges and Perspectives

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“…During the temperature increase, it is possible to detect the thermal decomposition of materials and the content of inert residues. Thermal stability measurements of GDLs provide information which can be relevant for MEA preparation processes such as hot pressing [21].…”

Section: Ex Situ Techniquesmentioning

confidence: 99%

Modification of gas diffusion layers properties to improve water management

Martı́n

Biswas

Gazdzicki

et al. 2017

Mater Renew Sustain Energy

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In this paper we report an approach to improve water management of commercial GDLs by introducing hydrophobicity patterns. Specifically, line and grid patterns have been created in the MPL side by laser radiation. For an in-depth investigation of these modified GDLs the current density distribution was monitored during fuel cell operation. Additionally, the physical properties of these materials were investigated by a number of ex situ methods such as Fourier transform infrared microscopy, electrochemical impedance spectroscopy and water vapor sorption. Furthermore, a comparison of the physical properties of the patterned GDLs with chemically modified GDLs (treated in H 2 SO 4 and H 2 O 2 ) is provided. Our results show a clearly improved homogeneity of current density distribution of the patterned GDLs compared to untreated GDLs. This observation is likely due to a reduced local hydrophobicity which facilitates water diffusion along the flow field of the fuel cell. However, performance of the fuel cell was not affected by the MPL irradiation.

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Effects of hot pressing conditions on the performances of MEAs for direct methanol fuel cells

Cited by 60 publications

References 20 publications

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

The Influence of Pt Loading, Support and Nafion Content on the Performance of Direct Methanol Fuel Cells: Examined on the Example of the Cathode

High Performance Membrane Electrode Assemblies by Optimization of Processes and Supported Catalysts

Modification of gas diffusion layers properties to improve water management

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