Effects of porous and dense electrode structures of membrane electrode assembly on durability of direct methanol fuel cells

2011 ◽  
Vol 36 (23) ◽  
pp. 15313-15322 ◽  
Author(s):  
Young-Chul Park ◽  
Segoo Kang ◽  
Sang-Kyung Kim ◽  
Seongyop Lim ◽  
Doo-Hwan Jung ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Direct Methanol Fuel Cells ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Direct Methanol ◽  
Methanol Fuel Cells

scholarly journals Cost-effective and durable Ru-sputtered Pt/C-based membrane–electrode assembly for passive direct methanol fuel cells

AIP Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 095016 ◽  
Author(s):  
Wonyeop Jeong ◽  
Ikwhang Chang ◽  
Sangbong Ryu ◽  
Chunhua Zheng ◽  
Suk Won Cha ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Direct Methanol Fuel Cells ◽  
Cost Effective ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Membrane electrode assembly for passive direct methanol fuel cells

2006 ◽  
Vol 162 (1) ◽  
pp. 497-501 ◽  
Author(s):  
HaeKyoung Kim ◽  
JungMin Oh ◽  
JoonHee Kim ◽  
Hyuk Chang
Keyword(s):  
Fuel Cells ◽  
Direct Methanol Fuel Cells ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Direct Methanol ◽  
Methanol Fuel Cells

scholarly journals Surface Roughening of Electrolyte Membrane for Pt- and Ru-Sputtered Passive Direct Methanol Fuel Cells

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3969 ◽  
Author(s):  
Jeong ◽  
Cho ◽  
Cha ◽  
Park
Keyword(s):  
Fuel Cells ◽  
Direct Methanol Fuel Cells ◽  
Membrane Electrode Assembly ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
High Concentration ◽  
Ru Catalyst ◽  
Electrolyte Membrane ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Platinum (Pt) and ruthenium (Ru) were sputtered on an electrolyte membrane and it was used as a membrane-electrode assembly for passive direct methanol fuel cells (DMFCs) operating with high concentration methanol solution (4 M). Thick (Pt of 300 nm and Ru of 150 nm) and thin (Pt of 150 nm and Ru of 75 nm) sputtered catalysts were prepared and their performance was first evaluated to find out the best sputtering conditions showing higher performance. Subsequently, four electrolyte membranes with different surface roughness were prepared to investigate its influence on the performance. As a result, the performance of the passive DMFC showed increasing tendency as the roughness is low, while the performance was decreased as the roughness was high, indicating there exists an optimal roughness of the electrolyte membrane. It was further investigated through morphological study through electron microscopy that such performance variation is attributed to the surface of sputtered Pt–Ru catalyst on the rough electrolyte membrane that adequate roughness induces the increase of reactive area while a too rough surface bears the poor contact of it with gas-diffusion layer.

scholarly journals A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

2021 ◽  
Vol 13 (24) ◽  
pp. 13938
Author(s):  
Arunkumar Jayakumar ◽  
Dinesh Kumar Madheswaran ◽  
Nallapaneni Manoj Kumar
Keyword(s):  
Fuel Cells ◽  
Direct Methanol Fuel Cells ◽  
Degradation Mechanism ◽  
Carbon Monoxide Poisoning ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Functional Attributes ◽  
Holistic Understanding ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Direct methanol fuel cells (DMFC) are typically a subset of polymer electrolyte membrane fuel cells (PEMFC) that possess benefits such as fuel flexibility, reduction in plant balance, and benign operation. Due to their benefits, DMFCs could play a substantial role in the future, specifically in replacing Li-ion batteries for portable and military applications. However, the critical concern with DMFCs is the degradation and inadequate reliability that affect the overall value chain and can potentially impede the commercialization of DMFCs. As a consequence, a reliability assessment can provide more insight into a DMFC component’s attributes. The membrane electrode assembly (MEA) is the integral component of the DMFC stack. A comprehensive understanding of its functional attributes and degradation mechanism plays a significant role in its commercialization. The methanol crossover through the membrane, carbon monoxide poisoning, high anode polarization by methanol oxidation, and operating parameters such as temperature, humidity, and others are significant contributions to MEA degradation. In addition, inadequate reliability of the MEA impacts the failure mechanism of DMFC, resulting in poor efficiency. Consequently, this paper provides a comprehensive assessment of several factors leading to the MEA degradation mechanism in order to develop a holistic understanding.

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