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Issue 15, 2017
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Hybrid n-type Sn1−xTaxO2 nanowalls bonded with graphene-like layers as high performance electrocatalysts for flexible energy conversion devices

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Abstract

We report here hybrid n-type Ta-doped SnO2 (Sn1−xTaxO2) nanowalls (as an electron-rich donor) bonded with graphene-like layers (Sn1−xTaxO2/C) as high performance electrocatalysts for flexible energy conversion devices. SnO2 possesses high electron mobility (125–250 cm2 V−1 S−1), and Ta doping is adopted to increase the electron concentration to further improve the conductivity of the SnO2 film to allow its use as a catalyst support. Our first-principles calculations reveal that the increased electrical conductance is mainly attributed to the increased intrinsic doping effect caused by the substitution of Sn by Ta. The Ta-doped SnO2 not only acts a well conductive support for the close coated graphene-like carbon layers but also pushes electrons to the carbon electrocatalyst to enhance its catalytic performance. Advanced features of these nanowall films include not only a high specific surface area, and good adhesion to substrates, but also flexibility. One application as a counter electrode in fully flexible dye-sensitized solar cells (DSSCs) shows that the optimal power conversion efficiency (PCE) of fully flexible DSSCs is 8.38% under AM1.5G illumination (100 mW cm−2), which is one of the highest PCEs for fully flexible DSSCs.

Graphical abstract: Hybrid n-type Sn1−xTaxO2 nanowalls bonded with graphene-like layers as high performance electrocatalysts for flexible energy conversion devices

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Publication details

The article was received on 26 Jan 2017, accepted on 09 Mar 2017 and first published on 09 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00893G
Citation: J. Mater. Chem. A, 2017,5, 6884-6892
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    Hybrid n-type Sn1−xTaxO2 nanowalls bonded with graphene-like layers as high performance electrocatalysts for flexible energy conversion devices

    Y. Duan, N. Fu, S. Li, X. Yang, J. Zheng, Y. Lin and F. Pan, J. Mater. Chem. A, 2017, 5, 6884
    DOI: 10.1039/C7TA00893G

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