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임한권

Lim, Hankwon
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Effects of transition metal doping in Pt/M-TiO2 (M = V, Cr, and Nb) on oxygen reduction reaction activity

Author(s)
Kim, Jun-HyukKwon, GihanLim, HankwonZhu, ChenhuiYou, HoydooKim, Yong-Tae
Issued Date
2016-07
DOI
10.1016/j.jpowsour.2016.04.019
URI
https://scholarworks.unist.ac.kr/handle/201301/24498
Fulltext
https://www.sciencedirect.com/science/article/pii/S0378775316303603?via%3Dihub
Citation
JOURNAL OF POWER SOURCES, v.320, pp.188 - 195
Abstract
High cost and low durability are unresolved issues that impede the commercialization of proton exchange membrane fuel cells (PEMFCs). To overcome these limitations, Pt/TiO2 is reported as an alternative electrocatalyst for enhancing the oxygen reduction reaction (ORR) activity and/or durability of the system. However, the low electrical conductivity of TiO2 is a drawback that may be addressed by doping. To date, most reports related to Pt/doped-TiO2 focus on changes in the catalyst activity caused by the Pt-TiO2 interaction (metal -support interaction), instead of the effect of doping itself; doping is merely considered to enhance the electrical conductivity of TiO2. In this study, we discuss the variation in the electronic fine structure of Pt caused by the dopant, and its correlation with the ORR activity. More extensive contraction of the Pt lattice in Pt/M-TiO2 (M = V, Cr, and Nb) relative to Pt/TiO2 and Pt/C leads to outstanding ORR specific activity of Pt/M-TiO2. Notably, a fourfold increase of the specific activity is achieved with Pt/V-TiO2 relative to Pt/C. Furthermore, an accelerated durability test (ADT) of Pt/V-TiO2 demonstrates that this system is three times more durable than conventional Pt/C due to the metal support interaction.
Publisher
ELSEVIER SCIENCE BV
ISSN
0378-7753
Keyword (Author)
PEMFCTiO2Metal-support interactionEXAFSORRDurability
Keyword
MEMBRANE FUEL-CELLSDOPED TIO2CATHODE CATALYSTELECTROCHEMICAL CHARACTERIZATIONHETEROGENEOUS CATALYSISALLOY ELECTROCATALYSTSELECTRONIC-PROPERTIESNANOTUBE ARRAYSDURABILITYNANOPARTICLES

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