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electrode was modified by polypyrrole (PPy) thin film. PPy was electrodeposited
potentiostatically by applying -1.5 V from acidic aqueous solution having
pyrrole monomers. The waiting time of deposition solution effect the surface
coverage of resulted films. PPy modified electrodes fabricated by old solution
have lower surface coverage than PPy obtained from freshly prepared solution.
PPy films were transferred to aqueous (acidic, neutral, alkaline) and a non-aqueous
(Deep Eutectic Solvent) solutions for cycling. Capacitance performance of PPy
film in a choline chloride based ionic liquid (Ethaline) was compared with that
of PPy films in aqueous solutions. As PPy film in salt solution (LiClO4
and NaCl) was evolved because deposition electrolyte was different (H2SO4)
than deposition electrolyte and salt ions are exchanged at the beginning of
cycling. Film obtained in acidic media was transferred into alkaline solution
or ionic liquid is electroinactive. PPy film is strongly electroactive in an
acidic media for hundreds of cycles as acidic media can cause the highest
charge which is directly related to capacitive performance. Upon increasing pH
value of cycling electrolyte, current and charge value decreases. PPy film in a
salt solution (NaCl or LiClO4 in water) and acidic solution (H2SO4)
is electroactive and can be used for supercapacitor application. As PPy film in
ionic liquids and alkaline solution cannot be electroactive, they cannot be
used for supercapacitor applications. Capacity retention of PPy in KOH and
Ethaline is low (around 5%). However, PPy thin film in H2SO4
has 77% of capacitance retention after 500 scans.
Electrodeposition Polypyrrole Graphite Ionic Liquid Supercapacitor
Birincil Dil | İngilizce |
---|---|
Konular | Malzeme Üretim Teknolojileri |
Bölüm | Araştırma Makalesi |
Yazarlar | |
Yayımlanma Tarihi | 1 Haziran 2019 |
Gönderilme Tarihi | 6 Aralık 2018 |
Kabul Tarihi | 23 Ocak 2019 |
Yayımlandığı Sayı | Yıl 2019 Cilt: 23 Sayı: 3 |
Sakarya University Journal of Science (SAUJS)