Constructing Exfoliated, Ti3C2Tx MXene-Dispersed, LaCoO3 and pC3N4-Based Nanocomposites with In Situ Grown Titania through Etching/Oxidation for Stimulating Solar H2 Production

Sehar Tasleem, Muhammad Tahir

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The use of a well-designed Ti3C2 MXene with in situ embedded titania nanoparticles to construct a porous carbon nitride (pCN)/LaCoO3 Z-scheme and S-scheme heterojunction for stimulating solar hydrogen production has been explored. A novel oxidized/etched approach was employed to produce MXene to maximize charge separation in LaCoO3 perovskite-dispersed pCN. On increasing the HF etching time from 24 to 48 h, the amount of titania embedded over the MXene was increased, enabling 1.71 times more H2 evolution. More importantly, integrated etched/oxidized Ti3C2 nanoflowers showed more reaction area with enhanced light absorption, which was more prominent with increased temperature. The H2 evolution was significantly increased due to in situ embedded TiO2. Comparatively, optimized 15Ti3C2Tx/pCN was found to be more efficient at lower temperatures, which was further increased 7-fold with a 10Ti3C2Tx/pCN-coupled LaCoO3 Z-scheme heterojunction. This obvious enhancement was evidently due to utilizing the maximum redox potential with good interface interaction among the components to promote charge carrier separation. Among the sacrificial agents, TEOA was found to be more promising, with 9.1 times more H2 production due to its strong bond with amine-based pCN, which was further confirmed by quantum analysis. In conclusion, the Z-scheme photosystem is promising for efficient mobility and separation of charges and would also be beneficial for other solar energy applications.

Original languageEnglish
Pages (from-to)1421-1440
Number of pages20
JournalEnergy and Fuels
Volume37
Issue number2
DOIs
Publication statusPublished - Jan 19 2023

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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