Scavenger-free and self-powered photocathodic sensing system for aqueous hydrogen peroxide monitoring by CuO/ZnO nanostructure

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

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Author(s)

  • Hao Wu
  • Hoi Ying Chung
  • Daniel C.W. Tsang
  • Nay Ming Huang
  • Zhirun Xie
  • Hong Ngee Lim
  • Yong Sik Ok

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number115886
Journal / PublicationChemical Engineering Science
Volume226
Online published8 Jun 2020
Publication statusOnline published - 8 Jun 2020

Abstract

A scavenger-free and self-powered photoelectrochemical sensor is developed to rapidly detect hydrogen peroxide (H2O2) in the aqueous phase. The resulting CuO/ZnO photocathode composite exhibits two-times higher photocurrent density than the bare CuO under simulated sunlight irradiation, attributed to the formed CuO/ZnO heterojunction with well-aligned band energy levels which promotes the interfacial charge separation of photogenerated electron-hole pairs. Herein, the resulting photocathode composite is assembled as a photoelectrochemical hydrogen peroxide sensor, which shows an instant response within 0.1 s and an approximately 3-fold increase in photocurrent density upon adding 30 mM of H2O2 into the electrolyte. The results further demonstrate that the effect of H2O2 on photocurrent response is concentration-dependent over the wide linear ranges of 0.2–1.0 mM and 1.0–8.0 mM with strong correlations (R2) of 0.992 and 0.986, respectively. The proposed CuO/ZnO photocathode composite can guide the design of efficient hybrid photoelectrodes for solar energy conversion applications.

Research Area(s)

  • CuO/ZnO, Hydrogen peroxide, Interfacial charge separation, Photoelectrochemical sensor

Citation Format(s)

Scavenger-free and self-powered photocathodic sensing system for aqueous hydrogen peroxide monitoring by CuO/ZnO nanostructure. / Wu, Hao; Chung, Hoi Ying; Tsang, Daniel C.W.; Huang, Nay Ming; Xie, Zhirun; Lim, Hong Ngee; Ok, Yong Sik; Ng, Yun Hau.

In: Chemical Engineering Science, Vol. 226, 115886, 23.11.2020.

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