TY - JOUR
T1 - The relationship between inherent properties of carbon nanotubes and electrochemical durability of supported-Pt catalysts
AU - Weerathunga, Don Terrence Dhammika
AU - Fujigaya, Tsuyohiko
N1 - Funding Information:
This study was supported in part by the Nanotechnology Platform Project from Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, KAKENHI (No. JP18H01816 , JP16K14084 , and JP16H06056 ) from the Japan Society for the Promotion of Science , and PRESTO (No. JPMJPR15R6 ) from Japan Science and Technology Agency . We also acknowledge to TEPCO Memorial Foundation for financial support. We thank Edanz Group ( www.edanzediting.com/ac ) for editing a draft of this manuscript. D. T. D. acknowledge to Japanese Government (Monbukagakusho) Scholarship.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/8
Y1 - 2019/8
N2 - The durability of polymer electrolyte membrane fuel cells (PEMFCs) is a key issue to be improved, especially for the next generation of PEMFCs that will be required to operate at higher temperatures (> 100 °C). An improvement of the durability of PEMFCs by using carbon nanotubes (CNTs) in place of carbon black as the support material for platinum catalysts is reported. To explore the mechanism for the enhancement of the durability as well as the structural dependency on the type of CNTs, accelerated durability tests are performed using several types of CNTs, which include multi-walled CNTs (MWCNTs) and single-walled CNTs (SWCNTs) loaded with Pt nanoparticles. By comparing the electrochemical surface area degradation and CNT oxidation profiles of their Pt composites, the electrochemical stability of CNTs is revealed to dominate the stability of the Pt. MWCNT having larger diameter with lower degree of side-wall defects offer a better durability than smaller MWCNT and also than SWCNTs. We found that onset temperature in the thermogravimetric analysis and their profiles provide an insight for predicting the durability of their Pt composites, which is useful for selecting of optimum CNTs.
AB - The durability of polymer electrolyte membrane fuel cells (PEMFCs) is a key issue to be improved, especially for the next generation of PEMFCs that will be required to operate at higher temperatures (> 100 °C). An improvement of the durability of PEMFCs by using carbon nanotubes (CNTs) in place of carbon black as the support material for platinum catalysts is reported. To explore the mechanism for the enhancement of the durability as well as the structural dependency on the type of CNTs, accelerated durability tests are performed using several types of CNTs, which include multi-walled CNTs (MWCNTs) and single-walled CNTs (SWCNTs) loaded with Pt nanoparticles. By comparing the electrochemical surface area degradation and CNT oxidation profiles of their Pt composites, the electrochemical stability of CNTs is revealed to dominate the stability of the Pt. MWCNT having larger diameter with lower degree of side-wall defects offer a better durability than smaller MWCNT and also than SWCNTs. We found that onset temperature in the thermogravimetric analysis and their profiles provide an insight for predicting the durability of their Pt composites, which is useful for selecting of optimum CNTs.
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U2 - 10.1016/j.diamond.2019.107459
DO - 10.1016/j.diamond.2019.107459
M3 - Article
AN - SCOPUS:85068468545
VL - 97
JO - Diamond and Related Materials
JF - Diamond and Related Materials
SN - 0925-9635
M1 - 107459
ER -