Octahedral morphology of NiO with (111) facet synthesized from the transformation of NiOHCl for the NO: Xdetection and degradation: Experiment and DFT calculation

Angga Hermawan, Adie Tri Hanindriyo, Erland Rachmad Ramadhan, Yusuke Asakura, Takuya Hasegawa, Kenta Hongo, Miki Inada, Ryo Maezono, Shu Yin

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Nitrogen oxides (NOx) are poisonous gases to humans and environment, and need to be monitored at an early stage. Accordingly, the design of facets on metal oxide semiconductors is an efficient approach to boost their gas sensing and photocatalytic performances due to the desirable active sites. However, in a rock-type structured NiO, a highly polar (111) exposed facets cannot be easily exposed due to their unfavorable thermodynamics. Herein, we demonstrate the synthesis of NiO with a dominant (111) facet from the transformation of NiOHCl with a layered structure. Among the crystal facets, NiO-Octa (111) exhibited the best NOx gas sensing response (16.5%) to the 300 ppb level and deNOx photocatalytic ability of over 50% under UV irradiation. DFT calculations revealed that the abundance of Ni atoms in the clean (111) surface layer allow the favorable adsorption of N adatoms, forming the Ni-N bond. The charge transfer occurring from NiO to the NO orbital was proven to be the cause for bond weakening and stretching from 1.1692 Å to 1.2231 Å, leading to NOx molecular decomposition, consistent with experimental results. This journal is

    Original languageEnglish
    Pages (from-to)3431-3442
    Number of pages12
    JournalInorganic Chemistry Frontiers
    Volume7
    Issue number18
    DOIs
    Publication statusPublished - 2020 Sep 21

    ASJC Scopus subject areas

    • Inorganic Chemistry

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