Combinatorial electrochemical synthesis and characterization of Tungsten-based mixed-metal oxides

Baeck, S. H., Jaramillo, T. F., Brandli, C. and McFarland, E. W. (2002) Combinatorial electrochemical synthesis and characterization of Tungsten-based mixed-metal oxides. Journal of Combinatorial Chemistry, 4 6: 563-568. doi:10.1021/cc020014w


Author Baeck, S. H.
Jaramillo, T. F.
Brandli, C.
McFarland, E. W.
Title Combinatorial electrochemical synthesis and characterization of Tungsten-based mixed-metal oxides
Journal name Journal of Combinatorial Chemistry   Check publisher's open access policy
ISSN 1520-4766
2156-8944
Publication date 2002-11-01
Sub-type Article (original research)
DOI 10.1021/cc020014w
Open Access Status Not yet assessed
Volume 4
Issue 6
Start page 563
End page 568
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
Automated systems for electrochemical synthesis and high-throughput screening of photoelectrochemical materials were developed and used to prepare tungsten-based mixed-metal oxides, WnOmMx [M = Ni, Co, Cu, Zn, Pt, Ru, Rh, Pd, and Ag], specifically for hydrogen production by photoelectrolysis of water. Two-dimensional arrays (libraries) of diverse metal oxides were synthesized by automated cathodic electrodeposition of the oxides on Ti foil substrates. Electrolytes for the mixed oxides were prepared from various metal salts added to a solution containing tungsten stabilized as a peroxo complex. Electrodeposition of the peroxo-stabilized cations gave rise to three distinguishable oxide groups: (1) mixed-metal oxides [Ni], (2) metal-doped tungsten oxides [Pt, Ru, Rh, Pd, Ag], and (3) metal-metal oxide composites [Co, Cu, Zn]. The oxides typically showed n-type semiconducting behavior. Automated measurement of photocurrent using a scanning photoelectrochemical cell showed the W-Ni mixed oxide had the largest relative zero bias photocurrent, particularly at a low Ni concentration (5-10 atomic percent Ni). Pt and Ru were also found to increase the photoactivity of bulk tungsten oxide at relatively low concentrations; however, at concentrations above 5 atomic percent, crystallization of WO3 was inhibited and photoactivity was diminished. Addition of Co, Cu, and Zn to WO3 was not found to improve the photoelectrochemical activity.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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