Automated electrochemical synthesis and photoelectrochemical characterization of Zn1-xCoxO thin films for solar hydrogen production

Jaramillo, Thomas F., Baeck, Sung-Hyeon, Kleiman-Shwarsctein, Alan, Choi, Kyoung-Shin, Stucky, Galen D. and McFarland, Eric W. (2005) Automated electrochemical synthesis and photoelectrochemical characterization of Zn1-xCoxO thin films for solar hydrogen production. Journal of Combinatorial Chemistry, 7 2: 264-271. doi:10.1021/cc049864x


Author Jaramillo, Thomas F.
Baeck, Sung-Hyeon
Kleiman-Shwarsctein, Alan
Choi, Kyoung-Shin
Stucky, Galen D.
McFarland, Eric W.
Title Automated electrochemical synthesis and photoelectrochemical characterization of Zn1-xCoxO thin films for solar hydrogen production
Formatted title
Automated electrochemical synthesis and photoelectrochemical characterization of Zn1-xCoxO thin films for solar hydrogen production
Journal name Journal of Combinatorial Chemistry   Check publisher's open access policy
ISSN 1520-4766
2156-8944
Publication date 2005-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1021/cc049864x
Open Access Status Not yet assessed
Volume 7
Issue 2
Start page 264
End page 271
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
High-throughput electrochemical methods have been developed for the investigation of Zn1-xCoxO films for photoelectrochemical hydrogen production from water. A library of 120 samples containing 27 different compositions (0 ≤ x ≤ 0.068) was synthesized by automated serial electrochemical deposition. High-throughput photoelectrochemical screening revealed improved solar hydrogen production for the cobaltdoped films, with Zn0.956Co0.044O exhibiting a 4-fold improvement over pure ZnO with no external bias. Flat-band potential, bias-dependent photocurrent, and action spectra were also measured automatically with the high-throughput screening system. The 200-nm-thick films were subsequently characterized by numerous techniques, including SEM, XRD, XPS, and UV-vis, which show that the depositions are well-controlled. Zn/Co stoichiometry in the films was controlled by the ratio of the Zn and Co precursors in each deposition bath. All films exhibited the wurtzite structure typical of pure ZnO, and the Co2+ appears to substitute Zn2+, forming a single-phase solid solution. Band gaps of the solid solutions were systematically lower than the 3.2-eV band gap typical of ZnO.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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