Tailoring metal-support interaction over faceted TiO2 and copper nanoparticles for electrocatalytic nitrate reduction to ammonia

Wahyu Prasetyo Utomo, Hao Wu*, Rui Liu, Yun Hau Ng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The electrocatalytic nitrate reduction reaction (NO3RR) provides a sustainable route for ammonia production while mitigating nitrate pollutants in the environment. Metal-support interaction has a significant influence on this electrocatalytic process. However, the mechanism of the facet-dependent metal-support interaction in the NO3RR is still unknown. Herein, we report the modulation of the metal-support interaction by depositing copper nanoparticles on anatase TiO2 with different facet exposures, i.e., (001) and (101) facets. The result of copper nanoparticles being deposited on TiO2 with dominant (101) facet exposure is an enhanced ammonia yield rate of 447.5 μg mgcat−1 h−1 at −0.9 V vs. reversible hydrogen electrode (RHE), which is 4.2 times higher than the pristine TiO2 counterpart. The strong interaction between copper nanoparticles and TiO2 with dominant (101) facet exposure contributes to a greater increase in catalytic performance than TiO2 with dominant (001) facet exposure. The strong interaction leads to electron-deficient copper nanoparticles, efficient electron transfer, and stronger binding of the *NO2 intermediate, promoting the hydrogenation process in the NO3 reduction reaction for selective NH3 synthesis.

Original languageEnglish (US)
Pages (from-to)1443-1453
Number of pages11
JournalGreen Chemistry
Volume26
Issue number3
DOIs
StatePublished - Dec 8 2023

Bibliographical note

Publisher Copyright:
© 2024 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

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