期刊
ANALYTICAL CHEMISTRY
卷 80, 期 19, 页码 7445-7450出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac801142g
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资金
- Korea Research Foundation [KRF-2005-214-C00204]
- American Chemical Society
- MERCK KGAA [UTA-07322]
- Robert A. Welch Foundation [F-0021]
- National Science Foundation [CHE-0451494]
- National Research Foundation of Korea [2005-214-C00204] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A method for rapid screening of photocatalysts employing a form of scanning electrochemical microscopy (SECM) is described. A piezoelectric dispenser was used to deposit arrays composed of similar to 300-mu m-size photocatalyst spots with different compositions onto conducting glass, fluorine-doped tin oxide substrate. The scanning tip of the SECM was replaced by a fiber optic connected to a xenon lamp and was rapidly scanned over the array. In this arrangement, the photocatalytic performance of the spots was evaluated by measuring the photocurrent at the substrate of the array. A fiber optic with a ring electrode can also be used to electrochemically detect products of the photoreaction. Several iron oxide-based bimetallic oxide combinations were found to exhibit enhanced photocatalytic activity, when compared to pure alpha-Fe2O3. These combinations included iron-palladium, iron-europium, and iron-rubidium in specific ratios. A trimetallic bismuth-vanadium-zinc oxide combination was also found to show a higher photocurrent, by similar to 40%, compared to BiVO3.
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