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Carbon corrosion properties and performance of multi-walled carbon nanotube support with and without nitrogen-functionalization in fuel cell electrodes
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- Kanninen, Petri (author)
- KTH,Tillämpad elektrokemi
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- Eriksson, Björn (author)
- KTH,Tillämpad elektrokemi
- Davodi, F. (author)
- show more...
- Buan, M. E. M. (author)
- Sorsa, O. (author)
- Kallio, T. (author)
- show less...
- (creator_code:org_t)
- Elsevier, 2020
- 2020
- English.
- In: Electrochimica Acta. - : Elsevier. - 0013-4686 .- 1873-3859. ; 332
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Pt-supported on multi-walled carbon nanotubes (MWCNT) and N-modified MWCNT (N-MWCNT) catalysts are synthesized by pyrolysis from emeraldine solution and microemulsion. Their electrochemical properties and carbon corrosion resistance in a Proton Exchange Membrane Fuel Cell (PEMFC) are compared with a commercial Pt/Vulcan catalyst through I–V curves, cyclic voltammetry and CO stripping. The initial fuel cell performances of the Pt/(N-)MWCNT catalysts are superior to Pt/Vulcan. The corrosion of the catalysts is quantified by the continuous measure of the CO2 release by online-mass spectrometry during potentiodynamic cycling between 0.1 and 1.6 V at 80 °C. The results show that Pt/MWCNT (with the lowest double-layer capacity) is the most stable catalyst followed by Pt/N-MWCNT and Pt/Vulcan, initially losing carbon at a rate of 1.1, 3.4 and 4.7 μgC (mg Ctot)−1 cycle−1, respectively. After about 30% carbon loss (50–70 cycles) all catalysts corrode at an approximate rate of 5.5 μgC mg−1 cycle−1. At this stage, all show similar electrochemical surface area and double-layer capacity. However, the substantial diminution of the initially very thick and porous Pt/(N-)MWCNT catalyst layers after corrosion consequences in lower fuel cell performance compared to the structurally less affected Pt/Vulcan electrode. The results clearly reveal that CNT-based catalyst supports are more corrosion resistant compared to state-of-the-art Vulcan. Moreover, the performance of the corroded electrodes envisages the importance of electrode porosity.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Carbon corrosion
- Carbon nanotubes
- Mass spectrometry
- Oxygen reduction
- PEMFC
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Kanninen, Petri
- Eriksson, Björn
- Davodi, F.
- Buan, M. E. M.
- Sorsa, O.
- Kallio, T.
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- NATURAL SCIENCES
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- Royal Institute of Technology
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