Synthesis of flower-like NiO and effects of morphology on its catalytic properties

Bin Zhao, Xiao Kang Ke, Jian Hua Bao, Chun Ling Wang, Lin Dong, Yu Wen Chen, Hui Lan Chen

Research output: Contribution to journalArticlepeer-review

267 Scopus citations


NiO with novel flower-like morphology was prepared by using a two-step, template-and surfactant-free, environmentally friendly method. Flower-like NiO was composed of many irregular nanosheets that were assembled together by weak interactions. The as-prepared materials were characterized by X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, transmission electron microscopy with selected area electron diffraction patterns, N2 sorption, temperature-programmed reduction with CO, X-ray photoelectron spectroscopy (XPS), and in situ Fourier transform infrared (FT-IR) for CO adsorption. The catalytic behaviors for CO oxidation were studied by using a fixed bed microreactor. Compared to NiO nanoparticles, we found the flower-like NiO possessed a larger surface area, bimodal pore size distribution, higher reducibility, and superior catalytic activity for CO oxidation. The XPS and CO in situ FT-IR results showed that its catalytic property was morphology dependent. The flower-like morphology provided more coordinate unsaturated Ni atoms, more oxygen vacancies, and more defect sites, which made the flower-like NiO have a strong interaction with CO and more active sites for catalytic reactions. Further studies showed that a mild condition for thermodecomposition of the precursor was necessary to preserve the flower-like morphology because of the large discrepancy of the crystalline cell structures between the β-Ni(OH) 2 precursor and product of NiO.

Original languageEnglish
Pages (from-to)14440-14447
Number of pages8
JournalJournal of Physical Chemistry C
Issue number32
StatePublished - 13 Aug 2009


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