Work

Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays

Year: 2012

Type: article

Abstract: In this paper, we show that by varying the voltages during two-step anodization the morphology of the hierarchical top-layer/bottom-tube TiO2 (TiO2 NTs) can be finely tuned between nanoring/nanotube, nanopore/nanotube, and nanohole–nanocave/nanotube morphologies. This allows us to optimize the photoelectrochemical (PEC) water splitting performance on the hierarchical TiO2 NTs. The optimized photocurrent density and photoconversion efficiency in this study, occurring on the nanopore/nanotube TiO2 NTs, were 1.59 mA cm−2 at 1.23 V vs. RHE and 0.84% respectively, which are the highest values ever reported on pristine TiO2 materials under illumination of AM 1.5G. Our findings contribute to further improvement of the energy conversion efficiency of TiO2-based devices.

Source: Energy & Environmental Science

DOI: 10.1039/c2ee03461a

Authors: Zhonghai Zhang, Peng Wang

Institution: King Abdullah University of Science and Technology

Language: English

Topic: TiO2 Photocatalysis and Solar Cells

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDGs: Affordable and clean energy, Clean water and sanitation

Open Access status: hybrid

OpenAlex ID: W2113777458

FWCI: 12.94

Cites: 32

Cited by: 345

Related to: 10