Constructing inverse opal structured hematite photoanodes via electrochemical process and their application to photoelectrochemical water splitting

Xinjian Shi, Kan Zhang, Kahee Shin, Jun Hyuk Moon, Tae Woo Lee, Jong Hyeok Park

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

In this study, we constructed an inverse opal structured hematite (IOS α-Fe2O3) as the photoanode of a photoelectrochemical (PEC) cell for efficient solar water splitting via a simple electrochemical process. At the same time, a series of affecting factors (template particle size, electrodeposition time and annealing temperature) to construct the IOS α-Fe2O3 photoanode on the photoelectrochemical water splitting were considered. Optimized PEC efficiency was observed for the IOS α-Fe2O3 photoanode annealed at 400 °C using the 250 nm sized-polystyrene (PS) colloid template and 9 minutes of electrodeposition time for the given specific Fe precursor solution. This resulted in the highest photocurrent density compared to other crossed conditions, which significantly achieved 3.1 mA cm-2 at 0.5 V vs. Ag/AgCl reference electrode. The synthesis of the IOS α-Fe 2O3via an easy-to-control electrochemical process is described for first time that opens a possibility for constructing other oxide semiconductor photoanodes (not only well-known Si, Ti and Zr) with inverse opal structure.

Original languageEnglish
Pages (from-to)11717-11722
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number28
DOIs
Publication statusPublished - 2013 Jul 28

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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