Hydrothermally designed Ag-modified TiO₂heterogeneous nanocatalysts for efficient hydrogen evolution by photo/electro/photoelectro-chemical water splitting.

IF 2.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Nanotechnology Pub Date : 2025-03-17 DOI:10.1088/1361-6528/adbd48

Mohd Fazil, Norah Alhokbany, Syed Asim Ali, Tokeer Ahmad

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引用次数: 0

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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来源期刊

Nanotechnology 工程技术-材料科学：综合

CiteScore

7.10

自引率

5.70%

发文量

820

审稿时长

2.5 months

期刊介绍： The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.