Oxygen vacancy defect tungsten-oxide-quantum-dot-modified nitrogen-doped graphene with interfacial tiny primitives to boost oxygen reduction reaction

Kai Chen, Wenmeng Wang, Linfeng Chen, Dung V. Dao, Jucheol Park, Rajmohan Rajendiran, In Hwan Lee, Oi L. Li

Research output: Contribution to journalArticlepeer-review

Abstract

Ultrafine quantum-dot-modified nitrogen-doped graphene has attracted board interest and has become frontier research in metal-air batteries and fuel cells. In this study, oxygen vacancy defect tungsten oxide quantum dots (Vo-WO3 QDs) are embedded in nitrogen-doped graphene (NG) to form abundant heterogeneous interfacial electrocatalysts (Vo-WO3 QDs/NG), which exhibits advanced electrocatalytic activity for oxygen reduction reaction (ORR) in an alkaline electrolyte. The optimized Vo-WO3 QDs/NG-5 (W content of 0.14 wt%) exhibits high onset potential (0.932 V vs. RHE) and decent half-wave potential (0.762 V vs. RHE) with high stability, which outperforms other reported tungsten metal oxide-based ORR electrocatalysts. The outstanding electrocatalytic performances of Vo-WO3 QDs/NG-5 are contributed by higher amount of oxygen vacancy and defects in Vo-WO3 QDs, as well as tunable interfacial electronic properties between the Vo-WO3 QDs and NG support. Furthermore, the density functional theory (DFT) is systematically conducted to determine the electronic properties and interface charge transmission for Vo-WO3 QDs/NG entity, providing important insight on the electrocatalysts in terms of band regulation and electron transport at the active interface between Vo-WO3 QDs and NG. Our finding paves an efficient pathway to design highly active hetero-structural and durable electrocatalysts for ORR applications based on defect-rich metal oxide QDs supported on nitrogen-doped graphene.

Original languageEnglish
Article number164588
JournalJournal of Alloys and Compounds
Volume908
DOIs
Publication statusPublished - 2022 Jul 5

Keywords

  • Defect WO QDs
  • Electrocatalyst
  • Interfacial effect
  • N-doped graphene
  • ORR

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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