Advanced materials and fabrication methods for electrochemical supercapacitors
Başlık çevirisi mevcut değil.
- Tez No: 403093
- Danışmanlar: DR. IGOR ZHITOMIRSKY
- Tez Türü: Yüksek Lisans
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: Mcmaster Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
The electrochemical supercapacitors (ESs) are an emerging technology that promises to play an important role in meeting the demands of automotive and electronic industry. A notable improvement in ES performance has been achieved through recent advances in understanding charge storage mechanisms and the development of advanced nanostructured materials, such as nanostructured MnO2 and composites. The anodic electrophoretic deposition (EPD) method has been developed for the fabrication of MnO2 and composite MnO2-multiwalled carbon nanotubes (MWCNTs) films. The problem of low stability of MnO2 suspensions was addressed by the development of new dispersing agents. Benzoic acid and phenolic molecules, such as 3,4- dihydroxybenzoic acid, 3,4-dihydroxyphenylacetic, 3,4-dihydroxyhydrocinnamic acid, 3,4,5-trihydroxybenzoic acid, salicylic acid, 2,3,4-trihydroxybenzoic acid, aurintricarboxylic acid and aurintricarboxylic acid ammonium salt were investigated as additives for the dispersion and charging of MnO2 nanoparticles. The adsorption of the organic molecules on the MnO2 nanoparticles involved the interaction of COOH groups and OH groups with Mn atoms on the particle surfaces and complexation. The results showed that adjacent OH groups, as well as adjacent OH and COOH groups bonded to the aromatic ring of the phenolic molecules enabled enhanced adsorption of the organic molecules. It was found that EPD of MnO2 and MWCNTs can be achieved using 3,4- dihydroxybenzoic acid, 2,3,4-trihydroxybenzoic acid, and aurintricarboxylic acid as a common dispersants and charging additives.
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