Abstract
Nitrogen doping into a metal oxide is a conventional method to prepare a visible-light-responsive photocatalyst. However, the charge imbalance that results from aliovalent anion substitution (i.e., O2–/N3– exchange) generally limits the concentration of nitrogen that can be introduced into a metal oxide, which leads to insufficient visible-light absorption capability. Here we report an effective route to synthesize nitrogen-doped metal oxide using KTiNbO5, which is a compositionally flexible layered oxide and can be exfoliated into nanoscale sheets. KTiNbO5 has a unique layered structure, in which Ti4+ and Nb5+ coexist in the same two-dimensional sheet, and controllable Ti4+/Nb5+ ratios while maintaining the original KTiNbO5-type structure. The use of a Nb-rich oxide precursor could allow for the improvement in the introduction of nitrogen compared with stoichiometric KTiNbO5 during thermal ammonolysis with ammonia gas. Reassembled KTiNbO5 nanosheets with a larger surface area were found to be more useful...
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