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Title: Sol-Gel Synthesis, Electrochemical Characterization, and Stability Testing of Ti0.7W0.3O2 Nanoparticles for Catalyst Support Applications in Proton-Exchange Membrane Fuel Cells

Abstract

The materials currently used in proton-exchange membrane fuel cells (PEMFCs) require complex control of operating conditions to make them sufficiently durable to permit commercial deployment. One of the major materials challenges to allow simplification of fuel cell operating strategies is the discovery of catalyst supports that are much more stable to oxidative decomposition than currently used carbon blacks. Here we report the synthesis and characterization of Ti 0.7W 0.3O 2 nanoparticles (approximately 50 nm diameter), a promising doped metal oxide that is a candidate for such a durable catalyst support. The synthesized nanoparticles were platinized, characterized by electrochemical testing, and evaluated for stability under PEMFC and other oxidizing acidic conditions. Ti 0.7W 0.3O 2 nanoparticles show no evidence of decomposition when heated in a Nafion solution for 3 weeks at 80 °C. In contrast, when heated in sulfuric, nitric, perchloric, or hydrochloric acid, the oxide reacts to form salts such as titanylsulfatehydrate from sulfuric acid. Electrochemical tests show that rates of hydrogen oxidation and oxygen reduction by platinum nanoparticles supported on Ti 0.7W 0.3O 2 are comparable to those of commercial Pt on carbon black.

Authors:
 [1];  [1];  [1];  [2];  [2];  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. General Motors Research and Development, Warren, MI (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Energy Materials Center at Cornell (EMC2)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1064856
DOE Contract Number:  
SC0001086
Resource Type:
Journal Article
Journal Name:
J. Am. Chem. Soc.
Additional Journal Information:
Journal Volume: 132; Journal Issue: 49; Related Information: Emc2 partners with Cornell University (lead); Lawrence Berkeley National Laboratory
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; catalysis (homogeneous); catalysis (heterogeneous); energy storage (including batteries and capacitors); hydrogen and fuel cells; defects; charge transport; membrane; materials and chemistry by design; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats

Subban, Chinmayee V., Zhou, Qin, Hu, Anthony, Moylan, Thomas E., Wagner, Frederick T., and DiSalvo, Francis J. Sol-Gel Synthesis, Electrochemical Characterization, and Stability Testing of Ti0.7W0.3O2 Nanoparticles for Catalyst Support Applications in Proton-Exchange Membrane Fuel Cells. United States: N. p., 2010. Web. doi:10.1021/ja1074163.
Subban, Chinmayee V., Zhou, Qin, Hu, Anthony, Moylan, Thomas E., Wagner, Frederick T., & DiSalvo, Francis J. Sol-Gel Synthesis, Electrochemical Characterization, and Stability Testing of Ti0.7W0.3O2 Nanoparticles for Catalyst Support Applications in Proton-Exchange Membrane Fuel Cells. United States. doi:10.1021/ja1074163.
Subban, Chinmayee V., Zhou, Qin, Hu, Anthony, Moylan, Thomas E., Wagner, Frederick T., and DiSalvo, Francis J. Fri . "Sol-Gel Synthesis, Electrochemical Characterization, and Stability Testing of Ti0.7W0.3O2 Nanoparticles for Catalyst Support Applications in Proton-Exchange Membrane Fuel Cells". United States. doi:10.1021/ja1074163.
@article{osti_1064856,
title = {Sol-Gel Synthesis, Electrochemical Characterization, and Stability Testing of Ti0.7W0.3O2 Nanoparticles for Catalyst Support Applications in Proton-Exchange Membrane Fuel Cells},
author = {Subban, Chinmayee V. and Zhou, Qin and Hu, Anthony and Moylan, Thomas E. and Wagner, Frederick T. and DiSalvo, Francis J.},
abstractNote = {The materials currently used in proton-exchange membrane fuel cells (PEMFCs) require complex control of operating conditions to make them sufficiently durable to permit commercial deployment. One of the major materials challenges to allow simplification of fuel cell operating strategies is the discovery of catalyst supports that are much more stable to oxidative decomposition than currently used carbon blacks. Here we report the synthesis and characterization of Ti0.7W0.3O2 nanoparticles (approximately 50 nm diameter), a promising doped metal oxide that is a candidate for such a durable catalyst support. The synthesized nanoparticles were platinized, characterized by electrochemical testing, and evaluated for stability under PEMFC and other oxidizing acidic conditions. Ti0.7W0.3O2 nanoparticles show no evidence of decomposition when heated in a Nafion solution for 3 weeks at 80 °C. In contrast, when heated in sulfuric, nitric, perchloric, or hydrochloric acid, the oxide reacts to form salts such as titanylsulfatehydrate from sulfuric acid. Electrochemical tests show that rates of hydrogen oxidation and oxygen reduction by platinum nanoparticles supported on Ti0.7W0.3O2 are comparable to those of commercial Pt on carbon black.},
doi = {10.1021/ja1074163},
journal = {J. Am. Chem. Soc.},
number = 49,
volume = 132,
place = {United States},
year = {2010},
month = {11}
}