Overcoming Charge Collection Limitation at Solid/Liquid Interface by a Controllable Crystal Deficient Overlayer
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Other documents of the author: Zhang, Kan; Ravishankar, Sandheep; Ma, Ming; Veerappan, Ganapathy; Bisquert, Juan; Fabregat-Santiago, Francisco; Park, Jong Hyeok
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comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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http://dx.doi.org/10.1002/aenm.201600923 |
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Title
Overcoming Charge Collection Limitation at Solid/Liquid Interface by a Controllable Crystal Deficient OverlayerAuthor (s)
Date
2017Publisher
WileyISSN
1614-6832; 1614-6840Bibliographic citation
ZHANG, Kan, et al. Overcoming charge collection limitation at solid/liquid interface by a controllable crystal deficient overlayer. Advanced Energy Materials, 2017, vol. 7, no 3.Type
info:eu-repo/semantics/articlePublisher version
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201600923/fullVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Bulk and surface charge recombination of photoelectrode are two key processes that significantly hinder solar-to-fuel conversion of photoelectrochemical cell (PEC). In this study, the function of a “crystal-deficient” ... [+]
Bulk and surface charge recombination of photoelectrode are two key processes that significantly hinder solar-to-fuel conversion of photoelectrochemical cell (PEC). In this study, the function of a “crystal-deficient” overlayer is unveiled, which outperforms a traditionally used amorphous or crystalline overlayer in PEC water splitting by exhibiting a high conductivity and large electron diffusion length to enable unlimited electron collection. The optimized ≈2.5 nm thickness of the “crystal-deficient” shell results in a depletion layer with a width of 3 nm, which overcomes the flat band limitation of the photovoltage and increases the light absorptivity in the wavelength range from 300 to 420 nm. In addition, a 50-fold increase in the conductivity yields a one-order-of-magnitude increase in the diffusion length of an electron (Ln)(≈20 μm), allowing for unlimited electron collection in the 1.9 μm TiO2 nanowire array with the “crystal-deficient” shell. The controllable “crystal-deficient” overlayer in rutile TiO2 nanowires photoanode achieves a photocurrent density greater than 2.0 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE), a 1.18% applied bias photon-to-current efficiency at 0.49 V versus RHE, a faradaic efficiency greater than 93.5% at 0.6 V versus Pt under air mass 1.5G simulated solar light illumination (100 mW cm−2). [-]
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Advanced Energy Materials, 2017, vol. 7, no 3.Rights
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