scholarly journals Role of disorder in limiting the true multi-electron redox in ε-LiVOPO4

2018 ◽  
Vol 6 (42) ◽  
pp. 20669-20677 ◽  
Author(s):  
Jatinkumar Rana ◽  
Yong Shi ◽  
Mateusz J. Zuba ◽  
Kamila M. Wiaderek ◽  
Jun Feng ◽  
...  
Keyword(s):  
Ball Milling ◽  
Side Reactions

Ball-milling-induced disorder and defects impede multi-electron redox in ε-LiVOPO4 and trigger side reactions.

scholarly journals Looking for the “Dream Catalyst” for Hydrogen Peroxide Production from Hydrogen and Oxygen

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 251 ◽  
Author(s):  
Federica Menegazzo ◽  
Michela Signoretto ◽  
Elena Ghedini ◽  
Giorgio Strukul
Keyword(s):  
Hydrogen Peroxide ◽  
Heterogeneous Catalysts ◽  
Direct Synthesis ◽  
Particle Morphology ◽  
Synthetic Methods ◽  
Side Reactions ◽  
Catalyst Morphology ◽  
And Performance ◽  
The Ideal

The reaction between hydrogen and oxygen is in principle the simplest method to form hydrogen peroxide, but it is still a “dream process”, thus needing a “dream catalyst”. The aim of this review is to analyze critically the different heterogeneous catalysts used for the direct synthesis of H2O2 trying to determine the features that the ideal or “dream catalyst” should possess. This analysis will refer specifically to the following points: (i) the choice of the metal; (ii) the metal promoters used to improve the activity and/or the selectivity; (iii) the role of different supports and their acidic properties; (iv) the addition of halide promoters to inhibit undesired side reactions; (v) the addition of other promoters; (vi) the effects of particle morphology; and (vii) the effects of different synthetic methods on catalyst morphology and performance.

Controlling side reactions and self-discharge in high-voltage spinel cathodes: the critical role of surface crystallographic facets

2015 ◽  
Vol 17 (39) ◽  
pp. 26471-26481 ◽  
Author(s):  
Saravanan Kuppan ◽  
Hugues Duncan ◽  
Guoying Chen
Keyword(s):  
High Voltage ◽  
Surface Passivation ◽  
Critical Role ◽  
Side Reactions ◽  
Crystallographic Facets

Reduced side reactions and self-discharge were observed on LMNO with (111) facets that promote surface passivation following initial cathode/electrolyte interactions.

Hydrogen Desorption Reactions of the Na-Mg-B-H System

2010 ◽  
Vol 72 ◽  
pp. 164-169 ◽  
Author(s):  
Daphiny Pottmaier ◽  
Sebastiano Garroni ◽  
Maria Dolors Barò ◽  
Marcello Baricco
Keyword(s):  
Solid State ◽  
Research And Development ◽  
Ball Milling ◽  
Powder Diffraction ◽  
Hydrogen Desorption ◽  
X Ray ◽  
New Compounds ◽  
Desorption Reaction

Hydrogen storage in the solid state has shown increasing research and development, and recently an approach in mixing two hydride systems together by ball milling (reactive hydride composites) has been investigated in more detail, e.g. NaBH4 plus MgH2. Thermodynamic destabilization may occur by new compounds formation during dehydrogenation, e.g. MgB2. A study of the the role of O2/H2O contamination for the reaction 2NaBH4 + MgH2 ↔ 2NaH + MgB2 + 4H2 was conducted using in-situ X-ray powder diffraction. Desorption reaction is observed to begin by a competition of MgH2 and NaBH4 decomposition due to higher reactivity promoted by ball milling processing summed to O2/H2O contamination. Oxidation of NaBH4 into NaBO2 is observed to happen in higher degree than MgH2/Mg into MgO for the Na-Mg-B-H system.

Mechanism of Enhanced Carbon Substitution in CNT-MgB2 Superconductor Composite Using Ball Milling in a Methanol Medium: Positive Role of Boron Oxide

2017 ◽  
Vol 31 (4) ◽  
pp. 1119-1126 ◽  
Author(s):  
Fahad Saad Alghamdi ◽  
M. Shahabuddin ◽  
Nasser S. Alzayed ◽  
Niyaz Ahamad Madhar ◽  
Jafar M. Parakkandy ◽  
...  
Keyword(s):  
Ball Milling ◽  
Boron Oxide ◽  
Mgb2 Superconductor ◽  
Positive Role ◽  
Carbon Substitution ◽  
Methanol Medium

Cr(VI) removal by micron-scale iron-carbon composite induced by ball milling: The role of activated carbon

2020 ◽  
Vol 389 ◽  
pp. 122633 ◽  
Author(s):  
Wenhao Wang ◽  
Bibo Hu ◽  
Chuang Wang ◽  
Zhijie Liang ◽  
Fuyi Cui ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Ball Milling ◽  
Carbon Composite
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