Enhanced Photoelectrochemical Solar Water Splitting Using a Platinum-Decorated CIGS/CdS/ZnO Photocathode

Mukund G. Mali, Hyun Yoon, Bhavana N. Joshi, Hyunwoong Park, Salem S. Al-Deyab, Dong Chan Lim, SeJin Ahn, Carlo Nervi, Suk Goo Yoon

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

A Cu(InGa)Se<inf>2</inf> film was modified with CdS/ZnO for application to solar water splitting. Platinum was electrodeposited on the ZnO layer as a hydrogen evolution catalyst. The effects of the electroplating time and acidity level of the electrolyte on the photocurrent density were studied. The highest photocurrent density of -32.5 mA/cm<sup>2</sup> under 1.5 AM illumination was achieved with an electroplating time of 30 min at a pH of 9. This photocurrent density is higher than those reported in previous studies. The markedly high performance of the CIGS/CdS/ZnO photocathode was rationalized in terms of its type II cascade structure that facilitated efficient charge separation at the interface junction.

Original languageEnglish
Pages (from-to)21619-21625
Number of pages7
JournalACS Applied Materials and Interfaces
Volume7
Issue number38
DOIs
Publication statusPublished - 2015 Sep 30

Keywords

  • CIGS/CdS
  • p-n junction
  • photocurrent
  • platinum
  • water splitting

ASJC Scopus subject areas

  • Materials Science(all)

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