Nanotextured cupric oxide nanofibers coated with atomic layer deposited ZnO-TiO2 as highly efficient photocathodes

Min woo Kim, Hyun Yoon, Tae Yoon Ohm, Hong Seok Jo, Seongpil An, Sung Kyu Choi, Hyunwoong Park, Salem S. Al-Deyab, Byoung Koun Min, Mark T. Swihart, Suk Goo Yoon

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We report the fabrication and performance of a CuO/ZnO/TiO2 nanofiber photocathode that achieved a photocurrent density (PCD) of −4.1 mA/cm2, which is among the highest PCD values reported for a copper oxide based photocathode without a co-catalyst. To prepare this photocathode, we coated electrospun nanofibers with copper by electroplating, then dried them in air to produce cuprous oxide (Cu2O) nanofibers. Further annealing in air converted them to cupric oxide (CuO). The CuO nanofibers exhibit nanotextured surfaces, resembling the skin of the “thorny-devil” lizard of Australia, providing high accessible surface area for photocatalysis. These CuO nanofibers were uniformly coated with thin ZnO and TiO2 layers by atomic layer deposition (ALD) to promote electron migration from CuO to TiO2 and protect the CuO from corrosion. The nanofibrous photocathode films were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, and transmission electron microscopy, as well as by incident photon-to-electron conversion efficiency measurements.

Original languageEnglish
Pages (from-to)479-485
Number of pages7
JournalApplied Catalysis B: Environmental
Volume201
DOIs
Publication statusPublished - 2017 Feb 1

Fingerprint

Photocathodes
Nanofibers
oxide
Oxides
Photocurrents
Copper oxides
Atomic layer deposition
Electrons
Photocatalysis
efficiency measurement
Electroplating
copper
Air
electron
Conversion efficiency
atomic force microscopy
Raman spectroscopy
cupric oxide
Copper
Atomic force microscopy

Keywords

  • Atomic layer deposition
  • Cupric oxide nanofibers
  • Photocathode
  • Photocurrent density
  • Water splitting

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Nanotextured cupric oxide nanofibers coated with atomic layer deposited ZnO-TiO2 as highly efficient photocathodes. / Kim, Min woo; Yoon, Hyun; Ohm, Tae Yoon; Jo, Hong Seok; An, Seongpil; Choi, Sung Kyu; Park, Hyunwoong; Al-Deyab, Salem S.; Min, Byoung Koun; Swihart, Mark T.; Yoon, Suk Goo.

In: Applied Catalysis B: Environmental, Vol. 201, 01.02.2017, p. 479-485.

Research output: Contribution to journalArticle

Kim, Min woo ; Yoon, Hyun ; Ohm, Tae Yoon ; Jo, Hong Seok ; An, Seongpil ; Choi, Sung Kyu ; Park, Hyunwoong ; Al-Deyab, Salem S. ; Min, Byoung Koun ; Swihart, Mark T. ; Yoon, Suk Goo. / Nanotextured cupric oxide nanofibers coated with atomic layer deposited ZnO-TiO2 as highly efficient photocathodes. In: Applied Catalysis B: Environmental. 2017 ; Vol. 201. pp. 479-485.
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