Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction

Jen Chao Ng, Chou Yong Tan, Boon Hoong Ong, Atsunori Matsuda, Wan Jefrey Basirun, Wai Kian Tan, Ramesh Singh, Boon Kar Yap

Research output: Contribution to journalArticle

Abstract

In spite of advantages of direct methanol fuel cells, low methanol oxidation reaction and fuel crossover from anode to cathode, there remains a challenge that inhibits it from being commercialized. Active electrocatalysts are in high demand to promote the methanol oxidation reaction. The methanol reached at the anode can be immediately reacted, and thus, less methanol to cross to the cathode. The performance of electrocatalysts can be significantly influenced by varying the concentration of precursor solution. Theoretically, concentrated precursor solution facilitates rapid nucleation and growth; diluted precursor solution causes slow nucleation and growth. Rapid nucleation and slow growth have positive effect on the size of electrocatalysts which plays a significant role in the catalytic performance. Upon the addition of appropriate concentration of graphene oxide, the graphene oxide was reported to have stabilizing effect towards the catalyst nanoparticles. This work synthesized reduced graphene oxide–supported palladium electrocatalysts at different concentrations (0.5, 1.0, 2.0, 3.0 and 4.0 mg mL −1 ) with fixed volume and mass ratio of reduced graphene oxide to palladium by microwave-assisted reduction method. Results showed that reduced graphene oxide–supported palladium synthesized at a concentration of 1.0 mg mL −1 gave the best methanol oxidation reactivity (405.37 mA mg −1 ) and largest electrochemical active surface area (83.57 m 2 g −1 ).

Original languageEnglish
JournalNanomaterials and Nanotechnology
Volume9
DOIs
Publication statusPublished - 01 Feb 2019

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Graphite
Electrocatalysts
Palladium
Graphene
Methanol
Nucleation
Oxidation
Oxides
Electrodes
Growth
Anodes
Cathodes
Direct methanol fuel cells (DMFC)
Microwaves
Nanoparticles
Catalysts

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Electrical and Electronic Engineering

Cite this

Ng, Jen Chao ; Tan, Chou Yong ; Ong, Boon Hoong ; Matsuda, Atsunori ; Basirun, Wan Jefrey ; Tan, Wai Kian ; Singh, Ramesh ; Yap, Boon Kar. / Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction. In: Nanomaterials and Nanotechnology. 2019 ; Vol. 9.
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Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction. / Ng, Jen Chao; Tan, Chou Yong; Ong, Boon Hoong; Matsuda, Atsunori; Basirun, Wan Jefrey; Tan, Wai Kian; Singh, Ramesh; Yap, Boon Kar.

In: Nanomaterials and Nanotechnology, Vol. 9, 01.02.2019.

Research output: Contribution to journalArticle

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