Publication date: 15th December 2014
Ta3N5 nanostructures are widely explored as anodes for photoelectrochemical (PEC) water splitting. Although the material shows excellent semiconductive properties, the key challenge is severe photocorrosion when the material used in typical aqueous environments. In the present work we introduce a NiFe layered double hydroxide (LDH) co-catalyst that dramatically reduces photocorrosion effects. To fabricate the Ta3N5 electrode, we use through-template-anodization of Ta and obtain oxide nanorod arrays that then are converted to Ta3N5 by high temperature nitridation. After modification with our co-catalyst system, we obtained solar photocurrents of 6.3 mA cm-2 at 1.23 V (vs. RHE) in 1 M KOH under AM 1.5G simulated sunlight (100 mW cm-2), and an electrode that maintains of about 80% of the initial activity for extended irradiation times. The combination of catalytic activity, stability, and decoration makes this new type of co-catalyst very promising to improve the photoelectrochemical performance of photoanodes in the field of energy conversion.
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