Electrochemical and Photoelectrochemical Properties of the Copper Hydroxyphosphate Mineral Libethenite

Man Li, Qian Cheng, Reed M. Wittman, Xihong Peng, Candace K. Chan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

There has been much interest recently in the discovery of new, non-oxide materials for photoelectrochemical applications. The copper hydroxyphosphate mineral libethenite, Cu2(OH)PO4 (CHP), which has a Jahn-Teller distorted structure and d9 electron configuration, has recently been reported to display photocatalytic activity. To better understand the properties of this material, a detailed investigation of the relevant fundamental characteristics such as the flatband potential, conduction type, and band diagram was performed using electrochemical and photoelectrochemical methods on CHP thin films deposited onto fluorine-doped tin oxide (FTO) substrates. Density functional theory was used to calculate the band structure, effective mass of electrons and holes, and vacancy formation energies in CHP. CHP was found to be active for electrochemical water oxidation, as confirmed by quantitative O2 measurements. Possible factors behind the low photocurrents observed in linear scanning voltammetry are discussed. Better understanding of this material may lead to the development of improved catalysts and photocatalysts from natural mineral sources.

Original languageEnglish
Pages (from-to)663-672
Number of pages10
JournalChemElectroChem
Volume1
Issue number3
DOIs
Publication statusPublished - Mar 1 2014

Keywords

  • Copper hydroxyphosphate
  • Photocatalysis
  • Photoelectrochemistry
  • Thin films
  • Water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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