Electrochemically controlled CdS@CdSe nanoparticles on ITO@TiO2 dual core–shell nanowires for enhanced photoelectrochemical hydrogen production

Yoonjun Cho, Minjeong Park, Jung Kyu Kim, Sungsoon Kim, Hyun Suk Jung, Jong Hyeok Park

Research output: Contribution to journalArticle

Abstract

Here, we report a novel dual heterostructured photoanode consisting of CdS@CdSe core–shell nanoparticles (NPs) and 1D-structure tin-doped indium oxide (ITO)@TiO2 core–shell nanowires (ITO@TiO2@CdS@CdSe) for highly efficient photoelectrochemical (PEC) hydrogen production. The finely controlled hierarchical core–shell CdS@CdSe sensitization from consecutive electrochemical deposition on the ITO@TiO2 core–shell nanowire has synergistic effects of visible-light utilization and efficient charge transport on the PEC response. The rationally designed dual core–shell heterostructure leads to cascade charge migration throughout the aligned energy band edges with rapid charge extraction through the hierarchical heterostructure of ITO@TiO2@CdS@CdSe, alleviating the crucial charge accumulation. As a result, the dual heterostructured photoanode exhibits a maximum photocurrent density of 20.11 mA/cm2 at 1.23 V vs. the reversible hydrogen electrode (RHE) and a dramatic enhancement in the incident photon-to-current efficiency (IPCE) over the extended absorption spectrum. The time-resolved photoluminescence (TRPL) characterization indicates the realized multiple-band cascade charge migration throughout ITO@TiO2@CdS@CdSe could promote an 8-fold increase in the charge separation efficiency. This rational design of dual-heterojunction-structured photoelectrodes via electrochemical deposition provides a demonstration of modifying conventional light-harvesting photoelectrodes with stagnate solar energy conversion and PEC hydrogen production.

Original languageEnglish
Article number144569
JournalApplied Surface Science
Volume505
DOIs
Publication statusPublished - 2020 Mar 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Electrochemically controlled CdS@CdSe nanoparticles on ITO@TiO<sub>2</sub> dual core–shell nanowires for enhanced photoelectrochemical hydrogen production'. Together they form a unique fingerprint.

  • Cite this