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Updated: May 12, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
Published on: May 2, 2014
Hydrothermally designed Ag-modified TiO2heterogeneous nanocatalysts for efficient hydrogen evolution by
Mohd Fazil1, Norah Alhokbany2, Syed Asim Ali3
1Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India.
Abstract:
One compelling goal of carbon-neutrality is to advance sustainable energy applications through advanced functional nanomaterials for achieving remarkable performance in energy conversion processes, especially in green H2energy. Here, Ag-modified TiO2nanostructures with highly specific exposed surface sites have been fabricated hydrothermally, elucidating its prominence towards photocatalytic, and photo/-electrocatalytic H2production. Further, the as-synthesized nanomaterials were investigated by XRD, electron microscopy (SEM/EDAX/TEM/HRTEM), ICP-MS, PL, Raman, UV-visible DRS, and BET surface area studies. The enhanced activity was established due to the exceptional optoelectronic properties and highly exposed active sites of the Ag-modified TiO2nanocatalysts. The photocatalytic activity of 2.5% Ag-doped TiO2photocatalyst demonstrated the highest hydrogen evolution, measuring 15.66 mmolgcat-1with 17.33% apparent quantum yield. Moreover, for photo-electrolysis, 1% and 2.5% Ag-doped TiO2nanocatalysts exhibited significantly improved activity with Tafel slopes of 162.49, 87.56 mV dec-1and onset potentials of 0.77 V (at 1.55 mA cm-2), -0.96 V (at 10 mA cm-2) for oxygen evolution reaction and hydrogen evolution reaction in alkaline and acidic conditions. Experiments indicated that incorporation of Ag ions in TiO2boosted the H2evolution due to the extraordinary surface properties and the presence of defect-sides /oxygen vacancies.
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