Incorporation of Ag nanowires in CuWO? for improved visible light-induced photoanode performance
By Zhang, H.; Yilmaz, P.; Ansari, J. O.; Khan, F. F.; Binions, R.; Krause, S. & Dunn, S.
Published in J. Mater. Chem. A
The Royal Society of Chemistry
2015
Abstract
We report the sol-gel synthesis of a CuWO? (Eg [similar] 2.0-2.15 eV) thin film loaded with Ag nanowires. The incorporation of Ag nanowires into the semiconductor matrix significantly improves the performance of CuWO? as a photoanode for use in photochemical water splitting (PEC). Here, we have developed a planar electrode to test the photoactivity of the catalyst using standard electrochemical procedures under simulated solar light. The sol-gel synthesis of CuWO? is modified such that we add Ag nanowires during sol aging. We demonstrate that there is negligible change to the CuWO? matrix microstructure, morphology or crystal structure. When we compare the pristine CuWO? to the material with Ag nanowires embedded in the CuWO? matrix there is a fourfold improvement of photocurrent at 1.23 V vs. NHE to ca. 1.5 mA cm-2 (pH 9) under simulated AM1.5G ill
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