Synergistic effect of cobalt in hierarchical carbon nitride nanorods (HCNNR) with promising charge transfer rate by hole scavenger for stimulating solar H2 production

Beenish Tahir, Muhammad Tahir, Mohammad Siraj, Amanullah Fatehmulla

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

One-dimensional (1D) hierarchical carbon nitrides nanorods (HCNNRs) mediated by cobalt was designed and synthesized using a template free hydrothermal approach for improving solar light assisted H2 evolution. The performance of 1D HCNNTs was significantly enhanced compared to bulk g-C3N4 due to larger active surface area, more visible light utilization and superior charge carrier along the unidirectional flow pathways. The 2% Co/HCNNRs (1D) exhibited excellent photocatalytic efficiency and optimal H2 yield reached up to 620 µmol g−1, which is 11.27 and 17.71 folds more than it was attained with pure HCNNR and bulk g-C3N4, respectively. This reveals that 1D structure helps to accelerate charge transport, whereas, Co works as a mediator to trap electrons, thus improving photocatalytic performance. The crucial operating parameters such as sacrificial reagents, feed concentration and catalyst loading were further optimized based on highest H2 evolution. Interestingly, mass transfer, charge transfer and amount of photoinduced charges were greatly dependent on the operating parameters. Higher methanol and lower TEOA concentration were beneficial to yield highest photoactivity and stability. This work provides new approach to construct template free 1D nanorods and would be beneficial to enhance performance in other solar energy related applications.

Original languageEnglish
Article number165332
JournalJournal of Alloys and Compounds
Volume916
DOIs
Publication statusPublished - Sept 25 2022

Keywords

  • Carbon nitrides nanorods (CNNR)
  • Cobalt cocatalyst
  • Operating parameters
  • Photocatalytic H evolution
  • Sacrificial reagents

ASJC Scopus subject areas

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

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