Bimetallic platinum–ruthenium nanoparticles immobilized on reduced graphene oxide-TiO2 (RGO-TiO2) support for ethanol electro oxidation in acidic media

The present work addresses the potentialities of Pt–Ru nanoparticles deposited on a graphene oxide (RGO) and TiO2 composite support towards electrochemical oxidation of ethanol in acidic media relevant for fuel cell applications. To immobilize platinum–ruthenium bimetallic nanoparticles on to an RGO...

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Bibliographic Details
Published in:International journal of hydrogen energy 2022-12, Vol.47 (95), p.40407-40414
Main Authors: Chandra Sekhar, Yellatur, Raghavendra, Padmasale, Maiyalagan, Thandavarayan, Loka, Subramanyam Sarma
Format: Article
Language:English
Subjects:
Electrocatalysis
Electrochemical ethanol oxidation
Reduced graphene oxide
Titanium dioxide
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Summary:The present work addresses the potentialities of Pt–Ru nanoparticles deposited on a graphene oxide (RGO) and TiO2 composite support towards electrochemical oxidation of ethanol in acidic media relevant for fuel cell applications. To immobilize platinum–ruthenium bimetallic nanoparticles on to an RGO-TiO2 nanohybrid support a simple solution-phase chemical reduction method is utilized. An examination using electron microscopy and energy dispersive X-ray spectroscopy (EDS) indicated that Pt–Ru particles of 4–8 nm in diameter are dispersed on RGO-TiO2 composite support. The corresponding Pt–Ru/RGO-TiO2 nanocomposite electrocatalyst was studied for the electrochemical oxidation of ethanol in acidic media. Compared to the commercial Pt–Ru/C and Pt/C catalysts, Pt–Ru/RGO-TiO2 nanocomposite yields higher mass-specific activity of about 1.4 and 3.2 times, respectively towards ethanol oxidation reaction (EOR). The synergistic boosting provided by RGO-TiO2 composite support and Pt–Ru ensemble together contributed to the observed higher EOR activity and stability to Pt–Ru/RGO-TiO2 nanocomposite compared with other in-house synthesized Pt–Ru/RGO, Pt/RGO and commercial Pt–Ru/C and Pt/C electrocatalysts. Further optimization of RGO-TiO2 composite support provides opportunity to deposit many other types of metallic nanoparticles onto it for fuel cell electrocatalysis applications. [Display omitted] •Reduced graphene oxide (RGO)-TiO2 composite was explored as a versatile support to deposit bimetallic Pt–Ru nanoparticles.•Electron microscopy results indicated that Pt–Ru particles are of 4–8 nm in diameter.•Synergistic boosting offered by RGO-TiO2 support and Pt–Ru yields higher ethanol oxidation reaction (EOR) activity.•Pt–Ru/RGO-TiO2 exhibit mass-specific activity of about 1.4 times compared to the commercial Pt–Ru/C.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2022.07.151