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Enhanced Stability and Electrochemical Performance of Carbon-Coated Ti3+ Self-Doped TiO2-Reduced Graphene Oxide Hollow Nanostructure-Supported Pt-Catalyzed Fuel Cell Electrodes

Title
Enhanced Stability and Electrochemical Performance of Carbon-Coated Ti3+ Self-Doped TiO2-Reduced Graphene Oxide Hollow Nanostructure-Supported Pt-Catalyzed Fuel Cell Electrodes
Authors
Sung, Chang HyunBoppella, RamireddyYoo, Jai-WookLim, Dong-HeeMoon, Byung-MooKim, Dong HaKim, Jin Young
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2017
Journal Title
ADVANCED MATERIALS INTERFACES
ISSN
2196-7350JCR Link
Citation
vol. 4, no. 21
Keywords
catalyst supportenhanced stabilityhollow structuresPEMFCsrGO/TiO2
Publisher
WILEY
Indexed
SCOPUS; SCIE WOS scopus
Abstract
Stable alternative catalyst supports to replace conventional carbon-based materials in polymer electrolyte membrane fuel cells (PEMFCs) are being explored to achieve dramatic improvements in the performance and durability of fuel cells. Herein, conductive Ti3+ self-doped and carbon-coated TiO2-reduced graphene oxide (rGO) hollow nanosphere-supported Pt nanoparticles (Pt/rGO/TiO2) are investigated as cathode electrocatalysts for PEMFCs. Importantly, the rGO/TiO2 hollow nanospheres display excellent electrochemical stability under high potential cycling (1.2-1.7 V) compared with conventional carbon black (CB) support materials that normally induce electrochemical corrosion during fuel cell operation. The Pt/rGO/TiO2 is tested to establish its catalytic activity and stability using accelerated durability testing that mimics the conditions and degradation modes encountered during long-term fuel cell operation. The Pt/rGO/TiO2 cathode catalyst demonstrates comparable catalytic activity toward oxygen reduction and exhibits much higher stability than the Pt/CB one at high potentials in terms of minimal loss of the Pt electrochemical surface area. More importantly, Pt/rGO/TiO2 displays a negligible voltage drop over long-term cycling during practical fuel cell operation. The high stability of the Pt/rGO/TiO2 electrocatalyst synthesized in this investigation offers a new approach to improve the reliability and durability of PEMFC cathode catalysts.
DOI
10.1002/admi.201700564
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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