Enhanced water splitting with silver decorated GaN photoelectrode
2016
By means of a cost-effective approach, we demonstrate a GaN-based photoelectrode decorated
with self-organized silver nano-islands employed for solar powered hydrogen generation,
demonstrating 4 times increase in photocurrent compared with a reference sample without
using any silver. Our photoelectrode exhibits a 60% incident photon-to-electron conversion
efficiency. The enhanced hydrogen generation is attributed to a significantly increased carrier
generation rate as a result of strongly localized electric fields induced by surface plasmon
coupling effect. The silver coating also contributes to the good chemical stability of our
photoelectrode in a strong alkali electrolyte. This work paves the way for the development
of GaN and also InGaN based photoelectrodes with ultra-high solar hydrogen conversion
efficiency.
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