Origin of extraordinarily high catalytic activity of Co3O4 and its morphological chemistry for CO oxidation at low temperature

Wang, Haifeng; Kavanagh, Richard; Guo, Yanglong; Guo, Yun; Lu, Guanzhong; Hu, P.

doi:10.1016/j.jcat.2012.09.005

Cited by 178 publications

(202 citation statements)

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“…The following section will describe this preferred pathway. On the basis of the experimental results and previous calculations 29,32 , CHO species plays very important roles in the oxidation of methane on many different catalyst surfaces; thus CH 3 O could dehydrogenate to CH 2 O and then CHO with a following oxidation to form product molecules.…”

Section: Resultsmentioning

confidence: 87%

“…Due to the strong correlation effect among the partially filled Co 3d states, we used the Hubbard parameter, U, for the Co 3d electrons to take the on-site Coulomb interaction into account, which is the well-known DFT þ U method 34 . According to previous work 29,43 , the value of U-J of 2 eV was applied. The projector-augmented wave method 44,45 was utilized to describe the electron-ion interactions, and the cut-off energy for the plane-wave basis set was 400 eV.…”

Section: Discussionmentioning

confidence: 99%

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Understanding complete oxidation of methane on spinel oxides at a molecular level

et al. 2015

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It is crucial to develop a catalyst made of earth-abundant elements highly active for a complete oxidation of methane at a relatively low temperature. NiCo 2 O 4 consisting of earth-abundant elements which can completely oxidize methane in the temperature range of 350-550°C. Being a cost-effective catalyst, NiCo 2 O 4 exhibits activity higher than precious-metal-based catalysts. Here we report that the higher catalytic activity at the relatively low temperature results from the integration of nickel cations, cobalt cations and surface lattice oxygen atoms/oxygen vacancies at the atomic scale. In situ studies of complete oxidation of methane on NiCo 2 O 4 and theoretical simulations show that methane dissociates to methyl on nickel cations and then couple with surface lattice oxygen atoms to form -CH 3 O with a following dehydrogenation to À CH 2 O; a following oxidative dehydrogenation forms CHO; CHO is transformed to product molecules through two different sub-pathways including dehydrogenation of OCHO and CO oxidation.

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Section: Resultsmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Understanding complete oxidation of methane on spinel oxides at a molecular level

et al. 2015

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“…In addition to the electrical behaviour, the catalytic properties of spinel-type transition metal oxides towards chemical or electrochemical reactions (e.g., Co oxidation, oxygen reduction/evolution, and redox conversion of NO and CO mixtures) have been found to be determined by the nature of the surface, namely, the atomic arrangement and coordination on the oxide surface. [75][76][77][78][79][80] Xiao et al synthesised Co 3 O 4 nanocrystals with different exposed surfaces on graphene sheets and studied the dependence of the electrocatalytic activity on the surface structure. 78 The surface atomic configurations in the {100}, {111}, and {110} planes are shown in Fig.…”

Section: General Aspects Of Spinel-type Transition Metal Oxidesmentioning

confidence: 99%

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Park

Kim

et al. 2015

Phys. Chem. Chem. Phys.

144

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. (2015). Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems. Physical Chemistry Chemical Physics, 17 (46), 30963-30977. Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems AbstractTransition metal oxides possessing two kinds of metals (denoted as AxB3-xO4, which is generally defined as a spinel structure; A, B = Co, Ni, Zn, Mn, Fe, etc.), with stoichiometric or even non-stoichiometric compositions, have recently attracted great interest in electrochemical energy storage systems (ESSs). The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale. Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed. The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale.Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed.

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“…For the Co 3 O 4 nanotubes, the remaining RuO 2 species might not directly contribute to CO oxidation at room temperature but might be involved in mediating the redox properties of the catalyst. Co 3 O 4 has a spinel structure containing Co 3+ in an octahedral coordination as the active site for CO oxidation [1,6]. The redox cycle between Co 3+ and Co 2+ is largely responsible for CO oxidation.…”

Section: Catalytic Performancementioning

confidence: 99%

“…Tricobalt tetraoxide (Co 3 O 4 ) shows morphology-dependent catalysis in chemical reactions such as CO oxidation [1][2][3][4][5][6], CH 4 combustion [7], hydrodesulfurization of fuels [8] and selective reduction of NO with NH 3 [9]. In these applications, the reaction rate was intimately associated with the morphology of the oxide particles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

Shen

2013

Catalysis Communications

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Origin of extraordinarily high catalytic activity of Co3O4 and its morphological chemistry for CO oxidation at low temperature

Cited by 178 publications

References 50 publications

Understanding complete oxidation of methane on spinel oxides at a molecular level

Understanding complete oxidation of methane on spinel oxides at a molecular level

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

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