Enhancing Catalytic CO Oxidation over Co3O4 Nanowires by Substituting Co2+ with Cu2+

Co3O4 is an attractive earth-abundant catalyst for CO oxidation, and its high catalytic activity has been attributed to Co3+ cations surrounded by Co2+ ions. Hence, the majority of efforts for enhancing the activity of Co3O4 have been focused on exposing more Co3+ cations on the surface. Herein, we enhance the catalytic activity of Co3O4 by replacing the Co2+ ions in the lattice with Cu2+. Polycrystalline Co3O4 nanowires for which Co2+ is substituted with Cu2+ are synthesized using a modified hydrothermal method. The Cu-substituted Co3O4_Cux polycrystalline nanowires exhibit much higher catalytic activity for CO oxidation than pure Co3O4 polycrystalline nanowires and catalytic activity similar to those single crystalline Co3O4 nanobelts with predominantly exposed most active {110} planes. Our computational simulations reveal that Cu2+ substitution for Co2+ is preferred over Co3+ both in the Co3O4 bulk and at the surface. The presence of Cu dopants changes the CO adsorption on the Co3+ surface sites only s...

[1]  G. Lu,et al.  Promoting Effects of In2O3 on Co3O4 for CO Oxidation: Tuning O2 Activation and CO Adsorption Strength Simultaneously , 2014 .

[2]  Wencai Zhu,et al.  Electrochemical sensing of glucose by carbon cloth-supported Co3O4/PbO2 core-shell nanorod arrays. , 2014, Biosensors & bioelectronics.

[3]  Yanhui Zhang,et al.  Low-temperature CO oxidation over Co3O4-based catalysts: Significant promoting effect of Bi2O3 on Co3O4 catalyst , 2014 .

[4]  Wenjie Shen,et al.  Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation , 2013 .

[5]  Li-ping Zhu,et al.  Iodine‐ion‐induced Size‐tunable Co3O4 Nanowires and the Size‐dependent Catalytic Performance for CO Oxidation , 2013 .

[6]  Hongjing Wu,et al.  Co3O4 nanocrystals and Co3O4–MOx binary oxides for CO, CH4 and VOC oxidation at low temperatures: a review , 2013 .

[7]  Yang Jiang,et al.  Au/3DOM Co3O4: highly active nanocatalysts for the oxidation of carbon monoxide and toluene. , 2013, Nanoscale.

[8]  Fan Yang,et al.  Interface-confined oxide nanostructures for catalytic oxidation reactions. , 2013, Accounts of chemical research.

[9]  G. Lu,et al.  Origin of extraordinarily high catalytic activity of Co3O4 and its morphological chemistry for CO oxidation at low temperature , 2012 .

[10]  Jyhfu Lee,et al.  Strong metal-support interactions between gold nanoparticles and ZnO nanorods in CO oxidation. , 2012, Journal of the American Chemical Society.

[11]  A. Selloni,et al.  Electronic states and magnetic structure at the Co3O4(110) surface: A first-principles study , 2012, 1201.6013.

[12]  Yadong Li,et al.  Ultrathin Co3O4 nanowires with high catalytic oxidation of CO. , 2011, Chemical communications.

[13]  J Rossmeisl,et al.  On the behavior of Brønsted-Evans-Polanyi relations for transition metal oxides. , 2011, The Journal of chemical physics.

[14]  Arne Thomas,et al.  Supported Cobalt Oxide Nanoparticles As Catalyst for Aerobic Oxidation of Alcohols in Liquid Phase , 2011 .

[15]  S. Dai,et al.  The role of low-coordinate oxygen on Co3O4(110) in catalytic CO oxidation. , 2011, Physical chemistry chemical physics : PCCP.

[16]  D. Duprez,et al.  Catalytic Oxidation of Carbon Monoxide over Transition Metal Oxides , 2011 .

[17]  Xiaolin Zheng,et al.  Plasma-enhanced catalytic CuO nanowires for CO oxidation. , 2010, Nano letters.

[18]  Yadong Li,et al.  Surface active sites on Co3O4 nanobelt and nanocube model catalysts for CO oxidation , 2010 .

[19]  Xianglan Xu,et al.  A DFT Study of CO Catalytic Oxidation by N2O or O2 on the Co3O4(110) Surface , 2009 .

[20]  M. Haruta,et al.  Pretreatments of Co3O4 at moderate temperature for CO oxidation at −80 °C , 2009 .

[21]  Wenjie Shen,et al.  Low-temperature oxidation of CO catalysed by Co3O4 nanorods , 2009, Nature.

[22]  P. Griffiths,et al.  A mechanistic study of the low-temperature conversion of carbon monoxide to carbon dioxide over a cobalt oxide catalyst , 2008 .

[23]  M. Langell,et al.  Cobalt oxide surface chemistry: The interaction of CoO(1 0 0), Co3O4(1 1 0) and Co3O4(1 1 1) with oxygen and water , 2008 .

[24]  M. M. Natile,et al.  Low temperature oxidation of carbon monoxide: the influence of water and oxygen on the reactivity of a Co3O4 powder surface , 2004 .

[25]  Hans W. Persson,et al.  A DFT Study on CO Oxidation over Co3O4 , 2002 .

[26]  Jonas Jansson,et al.  Low-Temperature CO Oxidation over Co3O4/Al2O3 , 2000 .

[27]  D. A. Shirley,et al.  High-Resolution X-Ray Photoemission Spectrum of the Valence Bands of Gold , 1972 .

[28]  Dong Rip Kim,et al.  Methane oxidation over catalytic copper oxides nanowires , 2011 .