Electrochemical responses of flexible graphite in H2SO4

Creative Commons License

Yazici M. S.

TURKISH JOURNAL OF CHEMISTRY, cilt.43, sa.5, ss.1398-1406, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 5
  • Basım Tarihi: 2019
  • Doi Numarası: 10.3906/kim-1906-19
  • Dergi Adı: TURKISH JOURNAL OF CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.1398-1406
  • Anahtar Kelimeler: Expanded graphite, flexible graphite, intercalation, H2SO4, EXPANDED GRAPHITE, BIPOLAR PLATES, ELECTRODE, DESIGN
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

Asymmetric capacitors are gaining attention due to their hybrid nature with higher power and energy density compared to individual batteries or capacitors. Electrochemical and structural characteristics of flexible graphite in 40% H2SO4 electrolyte are investigated using electrochemical and microscopy techniques. There is a correlation between intercalation of electrolyte and the enlargement of interlayer spacing and electrochemical response. Conditions favoring planar orientation are electrochemically less active and more stable in such corrosive electrolytes. There are response variations between plain and resin-impregnated flexible graphite samples. The reaction peak seems to be reversible for resin impregnated samples while plain samples show continuous intercalation. The higher positive potential limit in cyclic voltammetry causes peak potential to increase in orders of magnitudes.