Facile synthesis of polydopamine-functionalized hollow graphene composite microspheres and their application in methanol oxidation reaction

Chenxue Yao, Jie Xue, Lijian Xu, Yan Su, Jidong Bu, Rodney D. Priestley, Shifeng Hou

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, a novel polydopamine (PDA) coating graphene oxide (CG) microsphere (named as PDA/CG) is successfully synthesized and characterized. Graphene oxide (GO) is used as base structural material and carbon black nanoparticles (CB) act as spacers to form the hollow microsphere, which can also prevent the re-stacking of graphene and facilitate the formation and stability of spherical structures. The as-prepared PDA/CG provides high electrical conductivity, good hydrophilic microenvironment and functional nitrogen contained groups, which are beneficial to obtain ultrafine platinum nanoparticles (Pt NPs), stabilize Pt NPs and enhance the electrocatalytic performance of Pt-based electrocatalysts. As for the methanol oxidation reaction (MOR), the microstructure of Pt/PDA/CG provides a suitable microspace to facilitate the reactor agent transport, proton transmission and electrolyte fluidity. Pt/PDA/CG exhibits excellent electrocatalytic activity (2120 mA mgPt−1) toward MOR.

Original languageEnglish (US)
Article number148329
JournalApplied Surface Science
Volume541
DOIs
StatePublished - Mar 1 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Keywords

  • Carbon black
  • Direct methanol fuel cell
  • Graphene oxide
  • Polydopamine
  • Spray-drying

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