I am working on TiO2/MnO2 nano-composites for some electronic application.
Advantages: Excellent and wide-range performance could be obtained.
complementation or synergistic effect
(MnO2 shows a low conductivity and cycle performance for its unstable feature. and TiO2 can favor to enhance this)
Disadvantages: It is difficult to control the synthesis and products and more details need to be carefully considered. For example, TiO2/MnO2,
1.the Ti and Mn ions hydrolysis at different pH level. Here need to be fine controled, especially for the nanomaterials.
2. maybe you will get the MnOx (MnO2, Mn2O3, Mn3O4, MnO, etc), and how to get what you want with the best performance?
3. the controled and modulatory structure design between TiO2 and MnO2 for the enhancement of electrchemical property.
Advantages: Excellent and wide-range performance could be obtained.
complementation or synergistic effect
(MnO2 shows a low conductivity and cycle performance for its unstable feature. and TiO2 can favor to enhance this)
Disadvantages: It is difficult to control the synthesis and products and more details need to be carefully considered. For example, TiO2/MnO2,
1.the Ti and Mn ions hydrolysis at different pH level. Here need to be fine controled, especially for the nanomaterials.
2. maybe you will get the MnOx (MnO2, Mn2O3, Mn3O4, MnO, etc), and how to get what you want with the best performance?
3. the controled and modulatory structure design between TiO2 and MnO2 for the enhancement of electrchemical property.
First of all, MnO2 is the most stable compound among all manganese(IV)-based ones: it is easily formed by decomposition of other Mn(IV)-substances. Moreover, MnO2 is the result of Mn(II)-compounds oxidation. And the thing that comes particularly strongly is natural occurence of MnO2: this oxide is the most prevailing among other manganese inorganic compounds generally.
Therefore I express strong objection to the suggestion of the formation of other related different valenced oxides.
Second, the main feature wasn't mentioned: photocatalytic activity enhancement of TiO2 by addition of manganese(IV) oxide. The morphological and textural properties of the composites depend on the conditions of synthesis, i.e. on a chosen technique. Because sometimes SBET of such materials gets increased with MnO2 concentration (see xue2008.pdf) and in other cases one can find an opposite fact (see pendelyuk2005.pdf). Regarding adsorption properties of these complex composites, there is an interesting article is attached too - actually, pendelyuk2005.pdf. You're invited to look them all through.
Sincerely,
MN
MnO2 is stable but in the synthetic process MnOx could be formed depending on the raw material, organics, oxidation degree ,and other factors.
I and my coworkers have done some experiments about TiO2/MnOx and find that little Mn content and low crystallinity can benefit to a higher photocatalytic activity in the degradation of organic dyes. But More Mn and high crystallinity of MnO2 with a low activity can be attributed to the increasing e-h recombination or electron storage in MnO2. The similar results has been reported .Of course,the opposite results has been reported as well. so I think it is difficult to control the synthesis and products and more details need to be carefully considered.
As for your application in electronics (electrochemistry?) , maybe , I think the later (More Mn and high crystallinity of MnO2) will help you.
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