Enhancing the photoresponse of electrodeposited WO 3 film: Structure and thickness effect

Yun Ok Kim, Seung-Ho Yu, Kwang Soon Ahn, Sang Kwon Lee, Soon Hyung Kang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Electrodeposited WO 3 thin films were prepared on the W, Ti, and Nb metal substrates in strongly acidic solution containing a tungsten precursor of (0.025 M sodium tungstate dihydrate powder (Na 2 WO 4 ·2H 2 O)) and by varying the applied potential. The applied potential determined the thickness and crystallite size of the deposited WO 3 thin films, irrespective of the metal substrate. The thickness and crystallite size of the films, as well as the total consumed electric charge (Q), increased as the applied potential was increased from -0.27 to -0.47 V. Conversely, the photoelectrochemical (PEC) activity declined as the deposition potential increased; the optimal performance was achieved at a deposition potential of -0.27 V for all metal substrates. This potential generated a porous WO 3 film or a very thin WO 3 layer composed of small nanoparticles, both of which were favorable for electrolyte penetration leading to enhanced charge transport/transfer behavior and providing a large contact area for the electrolyte. Furthermore, the PEC performance of WO 3 on the W substrate was higher than those on the Ti and Nb substrates because of the homogenous composition of the W substrate that resulted in the least lattice disturbance. Thus, the maximum photocurrent density of 1.68 mA/cm 2 at 1.5 V (vs. saturated Ag/AgCl) with an IPCE of 31% at 330 nm was obtained with the electrodeposited WO 3 film grown at a deposition potential of -0.27 V on the W substrate. The charge-transport and charge-transfer behavior of the electrodeposited WO 3 film were respectively discussed based on linear sweep voltammograms and electrochemical impedance spectroscopy.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume752
DOIs
Publication statusPublished - 2015 Jan 1
Externally publishedYes

Fingerprint

Substrates
Charge transfer
Metals
Crystallite size
Electrolytes
Thin films
Electric charge
Tungsten
Photocurrents
Electrochemical impedance spectroscopy
Powders
Sodium
Nanoparticles
Chemical analysis

Keywords

  • Charge transfer
  • Crystallite size
  • Electrodeposition
  • Porosity
  • WO

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Enhancing the photoresponse of electrodeposited WO 3 film : Structure and thickness effect. / Kim, Yun Ok; Yu, Seung-Ho; Ahn, Kwang Soon; Lee, Sang Kwon; Kang, Soon Hyung.

In: Journal of Electroanalytical Chemistry, Vol. 752, 01.01.2015, p. 25-32.

Research output: Contribution to journalArticle

Kim, Yun Ok ; Yu, Seung-Ho ; Ahn, Kwang Soon ; Lee, Sang Kwon ; Kang, Soon Hyung. / Enhancing the photoresponse of electrodeposited WO 3 film : Structure and thickness effect. In: Journal of Electroanalytical Chemistry. 2015 ; Vol. 752. pp. 25-32.
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