Tunable Photo-Electrochemistry of Patterned TiO2/BDD Heterojunctions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Ze Jian
  • Nianjun Yang
  • Michael Vogel
  • Zhaoyu Zhou
  • Guohua Zhao
  • Paul Kienitz
  • Anna Schulte
  • Holger Schönherr
  • Xin Jiang

Detail(s)

Original languageEnglish
Article number2000257
Journal / PublicationSmall Methods
Online published15 Jun 2020
Publication statusOnline published - 15 Jun 2020

Abstract

Heterojunctions are especially attractive for photo-electrocatalytic applications if both high-performance photo and electrocatalysts are employed for their construction. Herein, a p–n heterojunction is synthesized using uniform patterns of p-type boron doped diamond (BDD) and an n-type anatase TiO2 film. The exposure ratios of the BDD patterns are varied to tune the photo-electrocatalytic abilities of this heterojunction. A heterojunction with a BDD exposure ratio of 20% exhibits a photocurrent density of 0.63 mA cm−2, which is 2.86-fold higher than that obtained on a BDD film and 1.91-fold higher than that obtained on a TiO2 film coated on a BDD film. It completely degrades methyl orange within 4 h, following the application of a 2.5 V bias potential, while the degradation efficiency on the BDD film and the TiO2 film is 56% and 45%, respectively. As confirmed by electron spin resonance spectroscopy, an accelerated production rate of •OH radicals is realized on this heterojunction. It originates from a synergistic effect between the BDD patterns that act as an ultra-microelectrode array with a TiO2/BDD p–n heterojunction as well as facilitated charge separation in a lateral direction. This TiO2/BDD patterned heterojunction is thus promising as a new photo-electrocatalyst for various catalytic applications.

Research Area(s)

  • boron-doped diamond, environmental pollutants, heterojunctions, photo-electrocatalysts, TiO2

Citation Format(s)

Tunable Photo-Electrochemistry of Patterned TiO2/BDD Heterojunctions. / Jian, Ze; Yang, Nianjun; Vogel, Michael; Zhou, Zhaoyu; Zhao, Guohua; Kienitz, Paul; Schulte, Anna; Schönherr, Holger; Jiao, Tianpeng; Zhang, Wenjun; Jiang, Xin.

In: Small Methods, 15.06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal