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In Situ Phase-Induced Spatial Charge Separation in Core-Shell Oxynitride Nanocube Heterojunctions Realizing Robust Solar Water Splitting
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2017 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 7, no 17, 1700171Article in journal (Refereed) Published
Abstract [en]

Efficient spatial charge separation is critical for solar energy conversion over solid photocatalysts. The development of efficient visible-light photocatalysts has been of immense interest, but with limited success. Here, multiband core-shell oxynitride nanocube heterojunctions composed of a tantalum nitride (Ta3N5) core and nitrogen-doped sodium tantalate (NaTaON) shell have been constructed via an in situ phase-induced etching chemical strategy. The photocatalytic water splitting performance of sub-20-nm Ta3N5@NaTaON junctions exhibits an extraordinarily high photocatalytic activity toward oxygen and hydrogen evolution. Most importantly, the combined experimental results and theoretical calculations reveal that the strong interfacial Ta-O-N bonding connection as a touchstone among Ta3N5@NaTaON junctions provides a continuous charge transport pathway rather than a random charge accumulation. The prolonged photoexcited charge carrier lifetime and suitable band matching between the Ta3N5 core and NaTaON shell facilitate the separation of photoinduced electron-hole pairs, accounting for the highly efficient photocatalytic performance. This work establishes the use of (oxy)nitride heterojunctions as viable photocatalysts for the conversion of solar energy into fuels.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2017. Vol. 7, no 17, 1700171
Keyword [en]
charge separation, core-shell nanocubes, heterojunctions, oxynitride, water splitting
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-214876DOI: 10.1002/aenm.201700171ISI: 000409410000017Scopus ID: 2-s2.0-85019015916OAI: oai:DiVA.org:kth-214876DiVA: diva2:1151460
Note

QC 20171023

Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2017-10-23Bibliographically approved

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Sun, Licheng

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Centre of Molecular Devices, CMDOrganic ChemistryChemistryTheoretical Chemistry and BiologyZhejiang-KTH Joint Research Center of Photonics, JORCEP
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