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

作者：Ma Ming; Shi Xinjian; Zhang Kan; Kwon Soonwoo; Li Ping; Kim Jung Kyu; Thanh Tran Phu; Yi Gi Ra; Park Jong Hyeok^*

来源：Nanoscale, 2016, 8(6): 3474-3481.

DOI：10.1039/c5nr08604c

4 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.

• 出版日期2016-2-14