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New Paper Published in Advanced Engineering Materials

Laser‐Textured Metal Substrates as Photoanodes for Enhanced PEC Water Splitting Reactions

Danny Bialuschewski, Jan S. Hoppius, Robert Frohnhoven, Meenal Deo, Yakup Gönüllü, Thomas Fischer, Evgeny L. Gurevich, Sanjay Mathur

Abstract

We demonstrate the effect of femtosecond laser structuring of titanium substrates to increase the absorption, photoconversion, and overall photoelectrochemical water splitting (PEC) performance compared to pristine metal substrates, independent of any additional top coat layers. The influence of ultra short laser pulse patterning on PEC efficiency is investigated toward spectroscopic (UVVis), microscopic (SEM), crystallographic (XRD), and compositional (XPS) properties. The beneficial effect of a periodically patterned substrate is attributed to enhanced specific surface area and improved inplane light trapping when compared to flat surfaces. Photoanodes for water splitting experiments fabricated by titanium and iron oxide films on laser prepatterned Ti substrates are also found to show enhanced PEC efficiency (0.057 mA cm−2) when compared to unpatterened substrates (0.028 mA cm−2). The lower absolute PEC efficiencies are due to extreme thin films.

 

Adv. Eng. Mater. (2018).

https://doi.org/10.1002/adem.201800167

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