The substitution effect of tantalum on the visible-light-driven water reduction activity of SrNbO2N photocatalyst
Source abstract
Abstract
A series of SrNb1-xTaxO2N (x=0, 0.25, 0.5, 0.75, 1) was synthesized by partially substituting Nb with Ta in order to modulate the electronic structure and photocatalytic water splitting performance of SrNbO2N. The Rietveld refinement results revealed that the cell volume of SrNb1-xTaxO2N was decreased with the increased addition tantalum amount in SrNb1-xTaxO2N. The band gap energy gradually increased with the increasing substituted Ta content. Meanwhile, XPS measurement demonstrated that the replacement of niobium with tantalum could hinder the reduction of both Nb and Ta during nitridation, which could reduce the defect density, being beneficial to improving the separation of photogenerated charge carriers. SrNb0.5Ta0.5O2N photocatalyst exhibited an optimal photocatalytic hydrogen evolution performance (814.02 μmol/g), which was 36.07 and 13.86 times than that of SrNbO2N (22.57 μmol/g) and SrTaO2N (58.73 μmol/g), respectively. This work might provide an effective strategy for tuning the photocatalytic activity of SrNbO2N by building solution solid.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Electronic and Structural Properties of Oxides · Inorganic Chemistry and Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (26)
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