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Nano Research

Article Title

Surface-area-tuned, quantum-dot-sensitized heterostructured nanoarchitectures for highly efficient photoelectrodes

Keywords

photoelectrochemical, hydrogen evolution, antimony-doped tin oxide, TiO2, quantum dot

Abstract

ABSTRACT Harvesting solar energy to produce clean hydrogen from photoelectrolysis of water presents a valuable opportunity to find alternatives for fossil fuels. Three- dimensional nanoarchitecturing techniques can afford enhanced photoelec-trochemical properties by improving geometrical and structural effects. Here, we report quantum-dot sensitized TiO2–Sb:SnO2 heterostructures as a model electrode to enable the optimization of the structural effects through the creation of a highly conductive pathway using a transparent conducting oxide (TCO), coupled with a high surface area, by introducing branching and low interfacial resistance via an epitaxial relationship. An examination of various morphologies (dot, rod, and lamella shape) of TiO2 reveals that the rod-shaped TiO2–Sb:SnO2 is a more effective structure than the others. A photoelectrode fabricated using optimized CdS–TiO2–Sb:SnO2 produces a photocurrent density of 7.75 mA/cm2 at 0.4 V versus a reversible hydrogen electrode. These results demonstrate that constructing a branched heterostructure based on TCO can realize high- performance photoelectrochemical devices.

Graphical Abstract

Publisher

Tsinghua University Press

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