Broadband Meta-Absorber with Au/Ni Core–Shell Nanowires for Solar Vapor Generator

Soomin Son, Jaemin Park, Sucheol Ju, Daihong Huh, Junho Jun, Kwan Kim, Pil Hoon Jung, Heon Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Solar energy has the advantages of being eco-friendly, practically infinite, and nonreliant on chemical fuels. A solar vapor generator uses sunlight to transform a liquid stream into a vapor stream to operate a turbine for generating electricity. For efficient vapor generation, it should absorb the sunlight in broad spectrum with high absorption, and also have high photothermal conversion efficiency. In this work, Ni nanowires and Au/Ni core–shell nanowire absorbers which meet the relevant conditions are fabricated using a cost-effective process for efficient solar vapor generation. The light is scattered and trapped in the nanowires and the electrical field is enhanced between the nanowires by the surface plasmonic gap resonance, resulting in high absorption. Also, the adiabatic nanofocusing structure generates heat at hot spots, resulting in efficient photothermal conversion. As a result, the Ni and Au/Ni core–shell nanowire absorbers respectively, absorb over 98% and 91% of the incident light in the solar spectrum. Further, the efficiency of photothermal conversion of the Au–Ni absorber under 1 Sun is found to be ≈33%. These absorbers have the potential to be applied to diverse fields, such as desalination, solar thermophotovoltaics, and metamaterials.

Original languageEnglish
Article number2000217
JournalAdvanced Sustainable Systems
Volume5
Issue number3
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • adiabatic nanofocusing structure
  • Au/Ni core–shell nanowires
  • broadband absorbers
  • solar vapor generators
  • surface plasmon resonance

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)

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