Thermally stable N 2-Intercalated WO 3 photoanodes for water oxidation

Qixi Mi; Yuan Ping; Yan Li; Bingfei Cao; Bruce S. Brunschwig; Peter G. Khalifah; Giulia A. Galli; Harry B. Gray; Nathan S. Lewis

doi:10.1021/ja3067622

Thermally stable N ₂-Intercalated WO ₃ photoanodes for water oxidation

Qixi Mi
, Yuan Ping
, Yan Li
, Bingfei Cao
, Bruce S. Brunschwig
, Peter G. Khalifah
, Giulia A. Galli
, Harry B. Gray
, Nathan S. Lewis

Chemistry

Stony Brook University

Research output: Contribution to journal › Article › peer-review

132 Scopus citations

Abstract

We describe stable intercalation compounds of the composition xN ₂̇WO ₃ (x = 0.034-0.039), formed by trapping N ₂ in WO ₃. The incorporation of N ₂ significantly reduced the absorption threshold of WO ₃; notably, 0.039N ₂̇WO ₃ anodes exhibited photocurrent under illumination at wavelengths ≥640 nm with a faradaic efficiency for O ₂ evolution in 1.0 M HClO ₄(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO ₃ host lattice, as well as weak electronic interactions between trapped N ₂ and the WO ₃ matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO ₃ materials similar to xN ₂̇WO ₃ are predicted to function as photoanodes that are responsive to visible light.

Original language	English
Pages (from-to)	18318-18324
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	134
Issue number	44
DOIs	https://doi.org/10.1021/ja3067622
State	Published - Nov 7 2012

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@article{31bf565d1d7e491fa79cd062836b2069,

title = "Thermally stable N 2-Intercalated WO 3 photoanodes for water oxidation",

abstract = "We describe stable intercalation compounds of the composition xN {\.2}WO 3 (x = 0.034-0.039), formed by trapping N 2 in WO 3. The incorporation of N 2 significantly reduced the absorption threshold of WO 3; notably, 0.039N {\.2}WO 3 anodes exhibited photocurrent under illumination at wavelengths ≥640 nm with a faradaic efficiency for O 2 evolution in 1.0 M HClO 4(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO 3 host lattice, as well as weak electronic interactions between trapped N 2 and the WO 3 matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO 3 materials similar to xN {\.2}WO 3 are predicted to function as photoanodes that are responsive to visible light.",

author = "Qixi Mi and Yuan Ping and Yan Li and Bingfei Cao and Brunschwig, \{Bruce S.\} and Khalifah, \{Peter G.\} and Galli, \{Giulia A.\} and Gray, \{Harry B.\} and Lewis, \{Nathan S.\}",

year = "2012",

month = nov,

day = "7",

doi = "10.1021/ja3067622",

language = "English",

volume = "134",

pages = "18318--18324",

journal = "Journal of the American Chemical Society",

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TY - JOUR

T1 - Thermally stable N 2-Intercalated WO 3 photoanodes for water oxidation

AU - Mi, Qixi

AU - Ping, Yuan

AU - Li, Yan

AU - Cao, Bingfei

AU - Brunschwig, Bruce S.

AU - Khalifah, Peter G.

AU - Galli, Giulia A.

AU - Gray, Harry B.

AU - Lewis, Nathan S.

PY - 2012/11/7

Y1 - 2012/11/7

N2 - We describe stable intercalation compounds of the composition xN 2̇WO 3 (x = 0.034-0.039), formed by trapping N 2 in WO 3. The incorporation of N 2 significantly reduced the absorption threshold of WO 3; notably, 0.039N 2̇WO 3 anodes exhibited photocurrent under illumination at wavelengths ≥640 nm with a faradaic efficiency for O 2 evolution in 1.0 M HClO 4(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO 3 host lattice, as well as weak electronic interactions between trapped N 2 and the WO 3 matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO 3 materials similar to xN 2̇WO 3 are predicted to function as photoanodes that are responsive to visible light.

AB - We describe stable intercalation compounds of the composition xN 2̇WO 3 (x = 0.034-0.039), formed by trapping N 2 in WO 3. The incorporation of N 2 significantly reduced the absorption threshold of WO 3; notably, 0.039N 2̇WO 3 anodes exhibited photocurrent under illumination at wavelengths ≥640 nm with a faradaic efficiency for O 2 evolution in 1.0 M HClO 4(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO 3 host lattice, as well as weak electronic interactions between trapped N 2 and the WO 3 matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO 3 materials similar to xN 2̇WO 3 are predicted to function as photoanodes that are responsive to visible light.

UR - https://www.scopus.com/pages/publications/84868525930

U2 - 10.1021/ja3067622

DO - 10.1021/ja3067622

M3 - Article

SN - 0002-7863

VL - 134

SP - 18318

EP - 18324

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 44

ER -

Thermally stable N ₂-Intercalated WO ₃ photoanodes for water oxidation

Abstract

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