Doping Effects of Metal-Doped Tin Oxide Nanoparticles Used As Carbon-Free ORR Catalysts for Polymer Electrolyte Fuel Cells

Polymer electrolyte fuel cells (PEFCs) are an important energy device for the realization of a hydrogen society. However, a longer service life is essential for the further spread of PEFCs. Currently, catalyst ( platinum supported on carbon, Pt/C) is the most mainstream cathode one. But, it has dura...

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Veröffentlicht in:Meeting abstracts (Electrochemical Society) 2024-11, Vol.MA2024-02 (41), p.2667-2667
Hauptverfasser: Fukuda, Takeshi, Tsuji, Ryuki, Tanabe, Maito, Ito, Seigo
Format: Artikel
Sprache:eng
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Zusammenfassung:Polymer electrolyte fuel cells (PEFCs) are an important energy device for the realization of a hydrogen society. However, a longer service life is essential for the further spread of PEFCs. Currently, catalyst ( platinum supported on carbon, Pt/C) is the most mainstream cathode one. But, it has durability issues due to carbon degradation during high potential sweeps. As an alternative material to carbon, tin oxide (SnO 2 ) is attracting attention due to its electrical conductivity and chemical stability. It has already been reported that Pt/SnO 2 catalysts using SnO 2 doped with antimony (Sb), niobium (Nb), tantalum (Ta), etc., and they exhibit high durability. However, they have a lower Pt electrochemical surface area (ECSA) and oxygen reduction mass activity (MA) compared to Pt/C. Therefore, further improvement of ECSA and MA is required for the practical use of Pt/SnO 2 . Other dopants may improve catalyst activity, so it’s worth checking the effects for doping other elements. In this study, a total of 20 metal-doped tin oxides (M-doped SnO 2 ) were synthesized. Pt metal-doped tin oxide (Pt/ M-SnO 2 ) was prepared by loading platinum onto the synthesized M-doped SnO 2 , and its catalytic performance was evaluated. M-doped SnO 2 nanoparticles were synthesized by the solvothermal method. Tin chloride pentahydrate, metal chlorides as doping materials, methanol, and tetramethylammonium hydroxide solution were mixed and stirred to form a precursor. The solution was placed in a Teflon-coated stainless steel autoclave and heat treated. After 12 hours, the reactants were washed and dried to obtain M-doped SnO 2 . Pt/M-SnO 2 was prepared using the polyol method. The prepared M-doped SnO 2 powder was mixed and dispersed in a mixed solvent of ethylene glycol and water, then platinum chloride hexahydrate was added and stirred overnight. The solution was then heated at 120°C for 2 hours to produce the platinum nanoparticles on the SnO 2 surface. The activity evaluation of the prepared catalysts was carried out at a rotating disk electrode in a three-electrodes cell system. The electrolyte was 0.1 M HClO 4 , the counter electrode was a platinum wire electrode, the reference electrode was a reversible hydrogen electrode, and the working electrode was a glassy carbon disk (GCD) electrode. Catalyst ink was dripped onto the working electrode and dry by spinning at 300 rpm for 1 hour. Measurements were performed by cyclic voltammetry (CV) and linear sweep voltammetry (LSV
ISSN:2151-2043
2151-2035
DOI:10.1149/MA2024-02412667mtgabs