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

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.

Authors:
; ORCiD logo; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; National Research Foundation of Korea (NRF); Korea Institute of Energy Technology Evaluation and Planning (KETEP)
OSTI Identifier:
1352588
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Power Sources; Journal Volume: 320
Country of Publication:
United States
Language:
English
Subject:
Durability; EXAFS; Metal-support interaction; ORR; PEMFC; TiO2

Citation Formats

Kim, Jun-Hyuk, Kwon, Gihan, Lim, Hankwon, Zhu, Chenhui, You, Hoydoo, and Kim, Yong-Tae. Effects of transition metal doping in Pt/M-TiO2 (M = V, Cr, and Nb) on oxygen reduction reaction activity. United States: N. p., 2016. Web. doi:10.1016/j.jpowsour.2016.04.019.
Kim, Jun-Hyuk, Kwon, Gihan, Lim, Hankwon, Zhu, Chenhui, You, Hoydoo, & Kim, Yong-Tae. Effects of transition metal doping in Pt/M-TiO2 (M = V, Cr, and Nb) on oxygen reduction reaction activity. United States. doi:10.1016/j.jpowsour.2016.04.019.
Kim, Jun-Hyuk, Kwon, Gihan, Lim, Hankwon, Zhu, Chenhui, You, Hoydoo, and Kim, Yong-Tae. 2016. "Effects of transition metal doping in Pt/M-TiO2 (M = V, Cr, and Nb) on oxygen reduction reaction activity". United States. doi:10.1016/j.jpowsour.2016.04.019.
@article{osti_1352588,
title = {Effects of transition metal doping in Pt/M-TiO2 (M = V, Cr, and Nb) on oxygen reduction reaction activity},
author = {Kim, Jun-Hyuk and Kwon, Gihan and Lim, Hankwon and Zhu, Chenhui and You, Hoydoo and Kim, Yong-Tae},
abstractNote = {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.},
doi = {10.1016/j.jpowsour.2016.04.019},
journal = {Journal of Power Sources},
number = ,
volume = 320,
place = {United States},
year = 2016,
month = 7
}