A 3D triple-deck photoanode with a strengthened structure integrality: Enhanced photoelectrochemical water oxidation

Ming Ma, Xinjian Shi, Kan Zhang, Soonwoo Kwon, Ping Li, Jung Kyu Kim, Thanh Tran Phu, Gi Ra Yi, Jong Hyeok Park

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

WO3/BiVO4 is one of the attractive Type II heterojunctions for photoelectrochemical (PEC) water splitting due to its well-matched band edge positions and visible light harvesting abilities. However, two light absorption components generally suffer from poor charge collection and cannot be efficiently utilized because of non-ideal interfaces. Herein, a triple-deck three-dimensional (3D) architecture was designed through a one-step shaping process with an additional stress relaxation WO3 underlayer. The final photoanodes showed a promising photocurrent density of 5.1 mA cm-2 at 1.23 V vs. RHE under AM 1.5G illumination. Using the uniformly distributed oxygen evolution co-catalyst (OEC) layer as the outer most shell of the WO3/BiVO4/OEC triple-deck 3D structure with a dense WO3 underlayer, the water splitting efficiency was improved dramatically by facilitating the charge transfer process at the electrode/electrolyte interface.

Original languageEnglish
Pages (from-to)3474-3481
Number of pages8
JournalNanoscale
Volume8
Issue number6
DOIs
Publication statusPublished - 2016 Feb 14

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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