Construction of CdSe polymorphic junctions with coherent interface for enhanced photoelectrocatalytic hydrogen generation

Qianqian Shen, Jinbo Xue, Yong Li, Guoxiang Gao, Qi Li, Xuguang Liu, Husheng Jia, Bingshe Xu, Yucheng Wu, Shen J. Dillon

Research output: Contribution to journalArticle

Abstract

CdSe with high densities of coherent polymorphic zincblende/wurtzite (ZB/WZ) interfaces were deposited on TiO2 nanorod arrays (NRAs) by electrodeposition and an optimized annealing process. In situ TEM annealing experiments observed the formation of the ZB/WZ polymorphic junctions that resulted from the change of atomic stacking sequence by dislocation movement induced by stoichiometry changes occurring during annealing. The process deforms CdSe4-tetrahedrons in ZB driving the ZB to WZ phase transition. The formation of ZB/WZ coherent polymorphic junctions enhanced the separation and transport of photo-generated electron-hole pairs in CdSe. The CdSe/TiO2 photoanode produced H2 at a rate of 260.9 μmol cm−2 h-1 under AM 1.5 global sunlight (AM 1.5 G). This is the highest reported value among CdSe-based photoanodes, which indicates the important role of the coherent polymorphic junctions.

Original languageEnglish (US)
Article number119552
JournalApplied Catalysis B: Environmental
Volume282
DOIs
StatePublished - Mar 2021

Keywords

  • CdSe@TiO
  • Coherent interface
  • Phase transitions
  • Photoelectrocatalysis
  • Polymorphic junction

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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