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

Nanoscale
Ming MaJong Hyeok Park

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.

References

Nov 20, 2001·Nature·M Grätzel
Sep 28, 2002·Science·Shahed U M KhanWilliam B Ingler
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Nov 11, 2010·Chemical Reviews·Michael G WalterNathan S Lewis
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Citations

Jan 27, 2017·Physical Chemistry Chemical Physics : PCCP·Junghyun ChoiUngyu Paik
Feb 23, 2019·Advanced Materials·Jin Hyun Kim, Jae Sung Lee

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