Ultrathin MnO2 nanoflakes as efficient catalysts for oxygen reduction reaction

Wei, Chao; Yu, Linghui; Cui, Chenlong; Lin, J.; Chen, Wei; Mathews, Nripan; Huo, Fengwei; Sritharan, Thirumany; Xu, Zhichuan J.

doi:10.1039/c4cc02781g

Cited by 111 publications

(73 citation statements)

References 45 publications

(39 reference statements)

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“…The synthetic methods for nanostructured MnO 2 include simple reduction, coprecipitation, sol-gel, thermal decomposition, and the hydrothermal synthesis molten-salt method (see [31] for a review). Various nano-structured objects investigated over the years include nanowires [32,33,34], nanorods [35,36], nanoflowers [37], nanosheets [38], nanoflakes [39,40], nanotubes [41,42], nanourchins [43,44], nanospheres [45], nanobelts [46], nanodisks [47], and nanofibers [48]. The various morphologies of nanostructure MnO 2 materials are illustrated by the SEM images in Figure 4.…”

Section: Synthesis Of Mno2 Nanomaterialsmentioning

confidence: 99%

Nanostructured MnO2 as Electrode Materials for Energy Storage

2017

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Manganese dioxides, inorganic materials which have been used in industry for more than a century, now find great renewal of interest for storage and conversion of energy applications. In this review article, we report the properties of MnO2 nanomaterials with different morphologies. Techniques used for the synthesis, structural, physical properties, and electrochemical performances of periodic and aperiodic frameworks are discussed. The effect of the morphology of nanosized MnO2 particles on their fundamental features is evidenced. Applications as electrodes in lithium batteries and supercapacitors are examined.

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Section: Synthesis Of Mno2 Nanomaterialsmentioning

confidence: 99%

Nanostructured MnO2 as Electrode Materials for Energy Storage

2017

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“…For instance, Mn 3 O 4 - [10][11][12] and MnO 2 -based 13,14 catalysts display excellent ORR catalytic activities, and some [11][12][13] are even comparable to Pt/C. Thus, many types of manganese oxides, particularly MnO 2 , have been extensively developed for ORR catalysis in recent years.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of an ε-MnO₂/metal–organic-framework composite and its electrocatalysis towards oxygen reduction reaction in an alkaline electrolyte

et al. 2015

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Electronic supplementary information (ESI) available: pore size distributions, EDX data, MOF(Fe) element mapping, C1s and O1s XPS spectra, RHE calibration, Electrochemical impedance spectra, MOF(Fe) CV curves, RDE voltammograms and corresponding K-L curves, MnO 2 ORR activities comparison, HORR and ORR catalytic activities comparison, and methanol crossover tests. AbstractAn ε-MnO 2 /metal-organic-framework(Fe) (i.e., ε-MnO 2 /MOF(Fe)) composite was synthesised by integrating ε-MnO 2 and a MOF(Fe) support. The composite was characterised using X-ray diffraction, N 2 adsorption-desorption, field emission scanning electron microscopy, transmission electron microscopy, element mapping, Fourier transform infrared spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The ORR activity of the composite was evaluated by cyclic and linear sweep voltammetries in an alkaline electrolyte. The results revealed that in the ε-MnO 2 /MOF(Fe) composite, ε-MnO 2 are in the form of nanorods, each with one end protruding and the other firmly anchored on the MOF(Fe) matrix with a high porosity and a high specific surface area. This unique structure of the composite is advantageous for oxygen diffusion and contact with the ε-MnO 2 during reactions, resulting in much better ORR activity and stability than those of the ε-MnO 2 in an alkaline electrolyte. The ε-MnO 2 /MOF(Fe)-catalysed ORR favours an apparent 4-electron transfer pathway in which oxygen was firstly reduced to hydroperoxide, which was further chemically decomposed into primarily OH -and O 2 .

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“…15,16 In recent years, more and more studies have been focused on exploring the relationship between the morphology, structure and catalytic activity of MnO 2 catalysts. 15,16 In recent years, more and more studies have been focused on exploring the relationship between the morphology, structure and catalytic activity of MnO 2 catalysts.…”

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confidence: 99%