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

doi:10.1039/C5NR08604C

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

Ming Ma,^a Xinjian Shi,^b Kan Zhang,^c Soonwoo Kwon,^d Ping Li,^a Jung Kyu Kim,^c Thanh Tran Phu,^d Gi-Ra Yi^d and Jong Hyeok Park*^c

Author affiliations

* Corresponding authors

^a SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Republic of Korea

^b Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA

^c Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea
E-mail: lutts@yonsei.ac.kr

^d School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea

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.

This article is part of the themed collection: 2016 Nanoscale HOT Article Collection

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DOI: https://doi.org/10.1039/C5NR08604C
Article type: Paper
Submitted: 04 Dec 2015
Accepted: 11 Jan 2016
First published: 12 Jan 2016

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Nanoscale, 2016,8, 3474-3481

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

M. Ma, X. Shi, K. Zhang, S. Kwon, P. Li, J. K. Kim, T. T. Phu, G. Yi and J. H. Park, Nanoscale, 2016, 8, 3474 DOI: 10.1039/C5NR08604C

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

Abstract

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

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