Next Article in Journal
Highly Porous Polymer-Derived Bioceramics Based on a Complex Hardystonite Solid Solution
Previous Article in Journal
Influence of Oxygen–Plasma Treatment on In-Situ SiN/AlGaN/GaN MOSHEMT with PECVD SiO2 Gate Insulator
Previous Article in Special Issue
Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding
Open AccessArticle

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

by Wonyeop Jeong 1,†, Gu Young Cho 2,†, Suk Won Cha 1,* and Taehyun Park 3,*
1
School of Mechanical and Aerospace Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
2
Department of Mechanical Engineering, Dankook University, 152, Jukjeon-ro, Suji-gu, Yongin-si, Gyeonggi-do 16890, Korea
3
School of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2019, 12(23), 3969; https://doi.org/10.3390/ma12233969
Received: 16 October 2019 / Revised: 28 November 2019 / Accepted: 28 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Advanced Materials for Energy and Environmental Applications)
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. View Full-Text
Keywords: direct methanol fuel cells; sputter; sandpaper; roughness; electrochemical impedance spectroscopy; polarization direct methanol fuel cells; sputter; sandpaper; roughness; electrochemical impedance spectroscopy; polarization
Show Figures

Figure 1

MDPI and ACS Style

Jeong, W.; Cho, G.Y.; Cha, S.W.; Park, T. Surface Roughening of Electrolyte Membrane for Pt- and Ru-Sputtered Passive Direct Methanol Fuel Cells. Materials 2019, 12, 3969.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop