SINW/C@Pt arrays for high-efficiency counter electrodes in dye-sensitized solar cells

Junhee Kim, Sanghoon Jung, Han Jung Kim, Yoonkap Kim, Chanyong Lee, Soo Min Kim, Donghwan Kim, Yongseok Jun

Research output: Contribution to journalArticle

Abstract

Modern energy needs and the pressing issue of environmental sustainability have driven many research groups to focus on energy-generation devices made from novel nanomaterials. We have prepared platinum nanoparticle-decorated silicon nanowire/carbon core–shell nanomaterials (SiNW/C@Pt). The processing steps are relatively simple, including wet chemical etching to form the silicon nanowires (SiNWs), chemical vapor deposition to form the carbon shell, and drop-casting and thermal treatment to embed platinum nanoparticles (Pt NPs). This nanomaterial was then tested as the counter electrode (CE) in dye-sensitized solar cells (DSSCs). SiNW/C@Pt shows potential as a good electrocatalyst based on material characterization data from Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Raman spectroscopy shows that the surface reactivity of the SiNW/C is increased by the decoration of Pt NPs. These data also show that the carbon shell included both graphitic (sp2 hybridization) and defective (sp3 hybridization) phases of carbon. We achieved the minimum charge-transfer resistance of 0.025 Ω · cm2 and the maximum efficiency of 9.46% with a symmetric dummy cell and DSSC device fabricated from the SiNW/C@Pt CEs, respectively.

Original languageEnglish
Article number139
JournalEnergies
Volume13
Issue number1
DOIs
Publication statusPublished - 2019 Dec 27

Keywords

  • Core–shell
  • Counter electrodes (CEs)
  • Defective carbon
  • Dye-sensitized solar cells (DSSCs)
  • Electrocatalytic activity
  • Silicon nanowires (SiNWs)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'SINW/C@Pt arrays for high-efficiency counter electrodes in dye-sensitized solar cells'. Together they form a unique fingerprint.

  • Cite this