Enhanced photoelectrochemical and sensing performance of novel TiO2 arrays to H2O2 detection

Lianqing Yu, Yaping Zhang, Qianqian Zhi, Qingqing Wang, Forrest S. Gittleson, Jinyang Li, André D. Taylor

Research output: Contribution to journalArticle

Abstract

Ag-decorated TiO2 nanowire arrays were facilely prepared by H2O2 corrosion of Ti and subsequent photodeposition of Ag. Array structures and photoelectric properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorption spectroscopy and electrochemical methods. These results show that Ag quantum dots are evenly distributed on the surface of TiO2 nanowires. With an Ag content of 0.4 at%, the electrode's photocurrent density and photoconversion efficiency obtained optimum values of 0.29 mA/cm2 and 8.55%, respectively. The enhanced photoelectrochemical properties with Ag modification can be attributed to the extended visible light absorption range and improved separation of photo-generated carriers. Additionally, the modified nanowire arrays exhibited much stronger photoelectrocatalytic reduction activity toward hydrogen peroxide in comparison with pure TiO2 arrays or previously reported Ag electrodes.

Original languageEnglish (US)
Pages (from-to)111-115
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume211
DOIs
StatePublished - May 2015

Keywords

  • Photodeposition
  • Photoelectrochemical property
  • Silver
  • TiO NW arrays

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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