Electrosprayed copper hexaoxodivanadate (CuV2O6) and pyrovanadate (Cu2V2O7) photoanodes for efficient solar water splitting

Min woo Kim, Bhavana Joshi, Hyun Yoon, Tae Yoon Ohm, Karam Kim, Salem S. Al-Deyab, Suk Goo Yoon

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Copper hexaoxodivanadate (CuV2O6) and copper pyrovanadate (Cu2V2O7) films were fabricated via electrostatic spray deposition for use as photoanodes for solar water splitting. The fabricated films were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, Transmission electron microscopy and X-ray diffraction analysis. The highest photocurrent density observed was 0.65 mA⋅cm−2 for a spraying time of 5 min in a mixed aqueous electrolyte consisting of 0.1 M borate and 0.1 M Na2SO3. The high photocurrent density is attributable to an improvement in the electrochemical kinetics at the electrode surface because of the scavenging holes from the electrolyte. The optimal annealing temperature was determined to be 500 °C. Further, Cu2V2O7 was confirmed to be more suitable than CuV2O6 with respect to water splitting, as it exhibited a higher photocurrent density.

Original languageEnglish
Pages (from-to)444-450
Number of pages7
JournalJournal of Alloys and Compounds
Volume708
DOIs
Publication statusPublished - 2017 Jun 25

Keywords

  • Copper vanadate oxide
  • Photoanode
  • Photocurrent
  • Water splitting

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Electrosprayed copper hexaoxodivanadate (CuV<sub>2</sub>O<sub>6</sub>) and pyrovanadate (Cu<sub>2</sub>V<sub>2</sub>O<sub>7</sub>) photoanodes for efficient solar water splitting'. Together they form a unique fingerprint.

Cite this