On the Underlying Mechanisms of the Low Observed Nitrate Selectivity in Photocatalytic NOx Abatement and the Importance of the Oxygen Reduction Reaction

Julia Patzsch, Andrea Folli, Donald Macphee, Jonathan Zacharias Bloh

Research output: Contribution to journalArticle

6 Citations (Scopus)
6 Downloads (Pure)

Abstract

Semiconductor photocatalysis could be an effective means to combat air pollution, especially nitrogen oxides, which can be mineralized to nitrate. However, the reaction typically shows poor selectivity, releasing a number of unwanted and possibly toxic intermediates such as nitrogen dioxide. Up to now, the underlying principles that lead to this poor selectivity were not understood so a knowledge-based catalyst design for more selective materials was impossible. Herein, we present strong evidence for the slow oxygen reduction being one the causes, as the competing back-reduction of nitrate leads to the release of nitrogen dioxide. Consequently, engineering the photocatalyst for a better oxygen reduction efficiency should also increase the nitrate selectivity.
Original languageEnglish
Pages (from-to)32678-32686
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume48
Issue number19
Early online date27 Nov 2017
DOIs
Publication statusPublished - 2017

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