Sub-10 nm Corrugated TiO2 Nanowire Arrays by Monomicelle-Directed Assembly for Efficient Hole Extraction.
J Am Chem Soc
; 144(45): 20964-20974, 2022 Nov 16.
Article
em En
| MEDLINE
| ID: mdl-36283036
ABSTRACT
Precise synthesis of well-ordered ultrathin nanowire arrays with tunable active surface, though attractive in optoelectronics, remains challenging to date. Herein, well-aligned sub-10 nm TiO2 nanowire arrays with controllable corrugated structure have been synthesized by a unique monomicelle-directed assembly method. The nanowires with an exceptionally small diameter of â¼8 nm abreast grow with an identical adjacent distance of â¼10 nm, forming vertically aligned arrays (â¼800 nm thickness) with a large surface area of â¼102 m2 g-1. The corrugated structure consists of bowl-like concave structures (â¼5 nm diameter) that are closely arranged along the axis of the ultrathin nanowires. And the diameter of the concave structures can be finely manipulated from â¼2 to 5 nm by simply varying the reaction time. The arrays exhibit excellent charge dynamic properties, leading to a high applied bias photon-to-current efficiency up to 1.4% even at a very low potential of 0.41 VRHE and a superior photocurrent of 1.96 mA cm-2 at 1.23 VRHE. Notably, an underlying mechanism of the hole extraction effect for concave walls is first clarified, demonstrating the exact role of concave walls as the hole collection centers for efficient water splitting.
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MEDLINE
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2022
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Article