II — kinetics of the catalytic decomposition of hydrogen peroxide solution by manganese dioxide samples

Rophael, M.W.; Petro, N.Sh.; Khalil, Laila B.

doi:10.1016/0378-7753(88)87004-6

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…2). MnO 2 is known to be a good hydrogen peroxide decomposition agent [22,23] and hence it is believed that the MnO 2 in the hybrid catalyst decomposes the peroxide that is generated electrochemically before it reaches the ring. Increasing the MnO 2 loading further to 10% and 15% by weight resulted in peroxide detection at the ring that was comparable to the pure Pt/C electrocatalyst.…”

Section: Rrde Results: Hydrogen Peroxide Formation On Pt/c and Pt/c-mmentioning

confidence: 99%

Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Trogadas

Ramani

2007

Journal of Power Sources

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Section: Rrde Results: Hydrogen Peroxide Formation On Pt/c and Pt/c-mmentioning

confidence: 99%

Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Trogadas

Ramani

2007

Journal of Power Sources

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“…Such mixed valence states of manganese ions were found to assist in O 2 redox reaction kinetics. 372 Moreover, the intercalation of Li + ions into tunnels could enhance the formation of oxygen-rich surfaces with Li-O 2 products having lower oxygen evolution reaction overpotentials. 63 Such findings are important in the sense that aand R-MnO 2 structure can act as a dual functioning electrode/electrocatalyst in Li-O 2 batteries.…”

Section: Cathode Materialsmentioning

confidence: 99%

Key scientific challenges in current rechargeable non-aqueous Li–O2 batteries: experiment and theory

Bhatt

Geaney

Nolan³

et al. 2014

Phys. Chem. Chem. Phys.

129

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Rechargeable Li-air (henceforth referred to as Li-O2) batteries provide theoretical capacities that are ten times higher than that of current Li-ion batteries, which could enable the driving range of an electric vehicle to be comparable to that of gasoline vehicles. These high energy densities in Li-O2 batteries result from the atypical battery architecture which consists of an air (O2) cathode and a pure lithium metal anode. However, hurdles to their widespread use abound with issues at the cathode (relating to electrocatalysis and cathode decomposition), lithium metal anode (high reactivity towards moisture) and due to electrolyte decomposition. This review focuses on the key scientific challenges in the development of rechargeable non-aqueous Li-O2 batteries from both experimental and theoretical findings. This dual approach allows insight into future research directions to be provided and highlights the importance of combining theoretical and experimental approaches in the optimization of Li-O2 battery systems.

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“…This mixed-valence environment is widely believed to assist in O 2 redox reaction kinetics. [ 34 ] In addition, Li + intercalation into the tunnels could create an environment on the surface that is favorable to the formation of oxygen-rich surfaces in Li 2 O 2 particles which have lower oxygen evolution reaction overpotentials. [ 41 ] We therefore conclude that the ability of α -MnO 2 to intercalate both lithium ions and lithium oxides and to provide a mixed-valence environment conducive to O 2 redox reactions may be important features that allow the α -MnO 2 /R-MnO 2 composite structure to act as a dual-function electrode/electrocatalyst, consistent with our conclusions from our experimental data.…”

Section: Full Papermentioning

confidence: 99%

Synthesis, Characterization, and Structural Modeling of High‐Capacity, Dual Functioning MnO₂ Electrode/Electrocatalysts for Li‐O₂ Cells

Trahey

Karan

Chan

et al. 2012

Advanced Energy Materials

115

119

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It has become clear that cycling lithium‐oxygen cells in carbonate electrolytes is impractical, as electrolyte decomposition, triggered by oxygen reduction products, dominates the cell chemistry. This research shows that employing an α‐MnO2/ramsdellite‐MnO2 electrode/electrocatalyst results in the formation of lithium‐oxide‐like discharge products in propylene carbonate, which has been reported to be extremely susceptible to decomposition. X‐ray photoelectron data have shown that what are likely lithium oxides (Li2O2 and Li2O) appear to form and decompose on the air electrode surface, particularly at the MnO2 surface, while Li2CO3 is also formed. By contrast, cells without α‐MnO2/ramsdellite‐MnO2 fail rapidly in electrochemical cycling, likely due to the differences in the discharge product. Relatively high electrode capacities, up to 5000 mAh/g (carbon + electrode/electrocatalyst), have been achieved with non‐optimized air electrodes. Insights into reversible insertion reactions of lithium, lithium peroxide (Li2O2) and lithium oxide (Li2O) in the tunnels of α‐MnO2, and the reaction of lithium with ramsdellite‐MnO2, as determined by first principles density functional theory calculations, are used to provide a possible explanation for some of the observed results. It is speculated that a Li2O‐stabilized and partially‐lithiated electrode component, 0.15Li2O·α‐LixMnO2, that has Mn4+/3+ character may facilitate the Li2O2/Li2O discharge/charge chemistries providing dual electrode/electrocatalyst functionality.

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II — kinetics of the catalytic decomposition of hydrogen peroxide solution by manganese dioxide samples

Cited by 17 publications

References 13 publications

Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Key scientific challenges in current rechargeable non-aqueous Li–O2 batteries: experiment and theory

Synthesis, Characterization, and Structural Modeling of High‐Capacity, Dual Functioning MnO₂ Electrode/Electrocatalysts for Li‐O₂ Cells

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II — kinetics of the catalytic decomposition of hydrogen peroxide solution by manganese dioxide samples

Cited by 17 publications

References 13 publications

Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Pt/C/MnO2 hybrid electrocatalysts for degradation mitigation in polymer electrolyte fuel cells

Key scientific challenges in current rechargeable non-aqueous Li–O2 batteries: experiment and theory

Synthesis, Characterization, and Structural Modeling of High‐Capacity, Dual Functioning MnO2 Electrode/Electrocatalysts for Li‐O2 Cells

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Synthesis, Characterization, and Structural Modeling of High‐Capacity, Dual Functioning MnO₂ Electrode/Electrocatalysts for Li‐O₂ Cells