Authors: Sebastian Proch Shuhei Yoshino Naohiko Kato Naoko Takahashi Yu Morimoto
Publish Date: 2016/08/26
Volume: 7, Issue: 6, Pages: 451-465
Abstract
Recently we showed that Nbdoped bulk TiO2 electrodes can be functionalized with minute amounts of Pt via COterminated Pt deposition but optimization of the conductivity of these electrodes via proton intercalation did not change the catalytic activity of the Pt deposits Here it is shown that intercalation of H species in 027 wt NH4F in glycol raises the catalytic activity of Pt deposited in a COterminated fashion if it is used on nanostructured titania nanotube arrays rather than titania bulk electrodes Catalyst support tuning becomes feasible for nanostructures but effects of the intercalation treatment fade away within days Moreover catalytic activities of ultralow Pt amounts as determined by ICPMS on TNAs are very low compared to deposition on gold This effect is attributed to high strain exerted on the Pt thin layers by the oxide supportSize Does Matter Unlike bulk TiO2 electrodes titania nanotube arrays TNAs are catalyst supports that facilitate tuning of the oxygen reduction response of sub and monolayer amounts of Pt from COterminated electrodeposition via proton intercalation
Keywords: