Scalable Binder-Free Supersonic Cold Spraying of Nanotextured Cupric Oxide (CuO) Films as Efficient Photocathodes

Jong Gun Lee, Do Yeon Kim, Jong Hyuk Lee, Min Woo Kim, Seongpil An, Hong Seok Jo, Carlo Nervi, Salem S. Al-Deyab, Mark T. Swihart, Suk Goo Yoon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We demonstrate production of nanotextured p-type cupric oxide (CuO) films via a low-cost scalable supersonic cold spray method in open air conditions. Simply sweeping the spray nozzle across a substrate produced a large-scale CuO film. When used as hydrogen evolution photocathodes, these films produced photocurrent densities (PCD) of up to 3.1 mA/cm2 under AM1.5 illumination, without the use of a cocatalyst or any additional heterojunction layers. Cu2O particles were supersonically sprayed onto an indium tin oxide (ITO) coated soda lime glass (SLG) substrate, without any solvent or binder. Annealing in air converted the Cu2O films to CuO, with a corresponding decrease in the bandgap and increase in the fraction of the solar spectrum absorbed. Annealing at 600 °C maximized the PCD. Increasing the supersonic gas velocity from ∼450 to ∼700 m/s produced denser films with greater surface roughness, in turn producing higher PCD. The nanoscale texture of the films, which resembles the skin of a dinosaur, enhanced their performance, leading to one of the highest PCD values in the literature. We characterized the films by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, and transmission electron microscopy to elucidate the origins of their outstanding performance. This supersonic cold spraying deposition has the potential to be used on a commercial scale for low cost mass production.

Original languageEnglish
Pages (from-to)15406-15414
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number24
DOIs
Publication statusPublished - 2016 Jun 22

Fingerprint

Photocathodes
Spraying
Oxide films
Binders
Photocurrents
Annealing
Spray nozzles
Substrates
Air
Tin oxides
Lime
Indium
Raman spectroscopy
Heterojunctions
Costs
Hydrogen
Atomic force microscopy
Skin
Energy gap
X ray photoelectron spectroscopy

Keywords

  • cupric oxide (CuO)
  • cuprous oxide (CuO)
  • nanotextured surface
  • supersonic cold spray
  • water splitting

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Scalable Binder-Free Supersonic Cold Spraying of Nanotextured Cupric Oxide (CuO) Films as Efficient Photocathodes. / Lee, Jong Gun; Kim, Do Yeon; Lee, Jong Hyuk; Kim, Min Woo; An, Seongpil; Jo, Hong Seok; Nervi, Carlo; Al-Deyab, Salem S.; Swihart, Mark T.; Yoon, Suk Goo.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 24, 22.06.2016, p. 15406-15414.

Research output: Contribution to journalArticle

Lee, JG, Kim, DY, Lee, JH, Kim, MW, An, S, Jo, HS, Nervi, C, Al-Deyab, SS, Swihart, MT & Yoon, SG 2016, 'Scalable Binder-Free Supersonic Cold Spraying of Nanotextured Cupric Oxide (CuO) Films as Efficient Photocathodes', ACS Applied Materials and Interfaces, vol. 8, no. 24, pp. 15406-15414. https://doi.org/10.1021/acsami.6b03968
Lee, Jong Gun ; Kim, Do Yeon ; Lee, Jong Hyuk ; Kim, Min Woo ; An, Seongpil ; Jo, Hong Seok ; Nervi, Carlo ; Al-Deyab, Salem S. ; Swihart, Mark T. ; Yoon, Suk Goo. / Scalable Binder-Free Supersonic Cold Spraying of Nanotextured Cupric Oxide (CuO) Films as Efficient Photocathodes. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 24. pp. 15406-15414.
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