Hierarchically Porous Few-Layer Carbon Nitride and Its High H+Selectivity for Efficient Photocatalytic Seawater Splitting

Shi Tian Xiao, Rui Yin, Lu Wu, Si Ming Wu, Ge Tian, Menny Shalom, Li Ying Wang, Yi Tian Wang, Fu Fei Pu, Hannah Noa Barad, Fazhou Wang, Xiao Yu Yang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Photocatalysts for seawater splitting are severely restricted because of the presence of multiple types of ions in seawater that cause corrosion and deactivation. As a result, new materials that promote adsorption of H+and hinder competing adsorption of metal cations should enhance utilization of photogenerated electrons on the catalyst surface for efficient H2production. One strategy to design advanced photocatalysts involves introduction of hierarchical porous structures that enable fast mass transfer and creation of defect sites that promote selective hydrogen ion adsorption. Herein, we used a facile calcination method to fabricate the macro-mesoporous C3N4derivative, VN-HCN, that contains multiple nitrogen vacancies. We demonstrated that VN-HCN has enhanced corrosion resistance and elevated photocatalytic H2production performance in seawater. Experimental results and theoretical calculations reveal that enhanced mass and carrier transfer and selective adsorption of hydrogen ions are key features of VN-HCN that lead to its high seawater splitting activity.

Original languageEnglish
Pages (from-to)4390-4398
Number of pages9
JournalNano Letters
Volume23
Issue number10
DOIs
StatePublished - 24 May 2023

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society. All rights reserved.

Keywords

  • carbon nitride
  • hierarchically porous
  • photocatalysis
  • seawater splitting

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