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The Impact of Nitrogen Doping and Reduced-Niobium Self-Doping on the Photocatalytic Activity of Ultra-Thin Nb3O8- Nanosheets

Abstract

Nitrogen doping via high-temperature ammonization is a frequently used strategy to extend the light harvest capacity of wide-bandgap catalysts into the visible region. In such a reductive atmosphere, the reduction of transition metal is supposed to occur, however, the effect of which is not well studied yet. Here, by combining chemically-controlled doping and subsequent liquid exfoliation, ultra-thin [Nb3O8]- nanosheets with separately N doping, reduced-Nb doping and N/reduced-Nb codoping were fabricated for comparative studies on the doping effect for photocatalytic hydrogen evolution. Layered KNb3O8 was used as the starting material and the above-mentioned three doping consequents were achieved by high-temperature treatment with urea, hydrogen and ammonia, respectively. The morphology, crystal and electronic structures, and catalytic activity of the products were characterized thoroughly by means of TEM, AFM, XRD, XPS, EPR, absorption spectra and photocatalytic hydrogen evolution. Significantly, the black N/reduced-Nb co-doped monolayer [Nb3O8]- nanosheets exhibit the mostly enhanced photocatalytic hydrogen generation rate, indicating a synergistic doping effect of the multiple chemical-design strategy. The modified electronic structure of [Nb3O8]- nanosheets and the role of exotic dopants in bandgap narrowing are put forward for the rational design of better photocatalysts with reduced-metal self-doping.

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Publication details

The article was received on 14 Aug 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03006A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    The Impact of Nitrogen Doping and Reduced-Niobium Self-Doping on the Photocatalytic Activity of Ultra-Thin Nb3O8- Nanosheets

    Y. Zhou, T. Wen, W. Kong, B. Yang and Y. Wang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03006A

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