Surface plasmon resonance enhancement of production of H2 from ammonia borane solution with tunable Cu2−xS nanowires decorated by Pd nanoparticles

Pei Hsuan Liu, Meicheng Wen, Chih-Shan Tan, Miriam Navlani-García, Yasutaka Kuwahara, Kohsuke Mori, Hiromi Yamashita, Lih-Juann Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Localized surface plasmon resonances (LSPR) in near-infrared (NIR) region have been extensively studied for copper chalcogenide nanostructures, not only for the absorption enhancement but also tunable LSPR characteristics with their free carrier concentrations or defects. In the present work, one-step cation exchange method has been used to synthesize Cu2−xS nanowires with x varied between 0 and 1, including Cu2S, Cu7S4 and CuS and so forth. The plasmonic band of Cu2−xS nanowires shifts to a shorter wavelength with the increase in x, as observed in vis-NIR spectra, which is attributed to the increase in density of copper vacancies. The Cu2−xS nanowires have been used as catalysts towards the photocatalytic generation of H2 from ammonia borane (AB). Among samples with different Cu-S compositions, Cu7S4 samples exhibited the highest activity in terms of H2 evolution rate (25.54 mmol/g h). Moreover, a marked enhancement of the H2 evolution rate (157.04 mmol/g h) could be achieved after decorating the Cu2−xS nanowires with Pd nanoparticles to form the hybrid structures. The results of the present investigation may lead to an effective strategy for the design and development of LSPR materials for photocatalytic applications.
Original languageEnglish
Pages (from-to)57-63
Number of pages7
JournalNano Energy
Volume31
DOIs
StatePublished - 1 Jan 2017

Keywords

  • Ammonia borane solution
  • Cu2-xS nanowires
  • Pd nanoparticles
  • Production of H2
  • Surface plasmon resonance enhancement

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