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

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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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.

Original languageEnglish
Article number115886
JournalChemical Engineering Science
Volume226
DOIs
Publication statusPublished - 2020 Nov 23

Bibliographical note

Funding Information:
This project was financially supported by the General Research Fund (GRF 11305419). The authors appreciate the facilities and technical support provided by the UNSW Mark Wainwright Analytical Centre.

Funding Information:
This project was financially supported by the General Research Fund (GRF 11305419 ). The authors appreciate the facilities and technical support provided by the UNSW Mark Wainwright Analytical Centre.

Publisher Copyright:
© 2020

Keywords

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

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Scavenger-free and self-powered photocathodic sensing system for aqueous hydrogen peroxide monitoring by CuO/ZnO nanostructure'. Together they form a unique fingerprint.

Cite this