Enhanced electrocatalytic full water-splitting reaction by interfacial electric field in 2D/2D heterojunction

Hyeonuk Choi, Subramani Surendran, Yelyn Sim, Minyeong Je, Gnanaprakasam Janani, Heechae Choi*, Jung Kyu Kim, Uk Sim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

To increase the productivity of hydrogen and oxygen generation, the carbon-based electrocatalyst with 2D/2D structure, graphitic carbon nitride with reduced graphene oxide (g-C3N4/rGO), was synthesized via a facile electrostatic self-assembly method and was used as electrocatalyst for full water-splitting. In the alkaline electrolyte, g-C3N4/rGO showed lower overpotential and Tafel slope of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, than the other 2D structured materials. The DFT calculation simulates the spontaneous electron transfer, low charge transfer resistance, and internal electric field of g-C3N4/rGO electrocatalysts. Especially, the internal electric field between the g-C3N4 and rGO is beneficial in solving the local pH reduction problem and electron transport. Consequentially, our study elucidates that 2D/2D structure, inducing the internal electric field, is an effective way to enhance the performance of the full water-splitting system.

Original languageEnglish
Article number137789
JournalChemical Engineering Journal
Volume450
DOIs
Publication statusPublished - 15 Dec 2022
Externally publishedYes

Keywords

  • 2D/2D heterostructure
  • Electrocatalyst
  • Full water-splitting
  • Graphitic carbon nitride
  • Reduced graphene oxide

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