Enhanced Charge Transport in Tantalum Nitride Nanotube Photoanodes for Solar Water Splitting | Zendy

Wang Lei | Zendy; Nguyen Nhat Truong | Zendy; Zhou Xuemei | Zendy; Hwang Imgon | Zendy; Killian Manuela S. | Zendy; Schmuki Patrik | Zendy

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Enhanced Charge Transport in Tantalum Nitride Nanotube Photoanodes for Solar Water Splitting

Author(s) -

Wang Lei,

Nguyen Nhat Truong,

Zhou Xuemei,

Hwang Imgon,

Killian Manuela S.,

Schmuki Patrik

Publication year - 2015

Publication title -

chemsuschem

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.412

H-Index - 157

eISSN - 1864-564X

pISSN - 1864-5631

DOI - 10.1002/cssc.201500632

Subject(s) - water splitting , tantalum nitride , materials science , tantalum , nitride , nanotube , nanotechnology , charge (physics) , solar energy conversion , solar energy , carbon nanotube , photocatalysis , chemistry , metallurgy , catalysis , physics , layer (electronics) , biochemistry , ecology , quantum mechanics , biology

In the present work we grow anodic self‐organized Ta 2 O 5 nanotube layers, which are converted by ammonolysis to Ta 3 N 5 nanotubes, and then are used as photoanodes for photoanalytic water splitting. We introduce a two‐step anodization process that not only improves order (reduced growth defects) and overall light absorption in the nanotube layers, but also provides a significantly reduced interface charge resistance at the nitride/metal interface due to subnitride (TaN x ) formation. As a result, such nanotube anodes afford a 15‐fold increase of the photocurrent compared with conventional nanotubular Ta 3 N 5 electrodes under AM 1.5 G simulated sunlight (100 mW cm −2 ) conditions.

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