Widening of the electroactivity potential range by composite formation – capacitive properties of TiO2/BiVO4/PEDOT:PSS electrodes in contact with an aqueous electrolyte

Beilstein Journal of Nanotechnology

Mariusz Szkoda^1¹  Konrad Trzciński^1² 

[1] Faculcty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland^2;Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland^1

关键词: bismuth vanadate (BiVO4);    electrochemical activity;    PEDOT:PSS;    supercapacitors;    titania nanotubes;   

DOI  :  10.3762/bjnano.10.49

学科分类：地球科学(综合)

来源: Beilstein - Institut zur Foerderung der Chemischen Wissenschaften

【 摘 要 】

Composites based on the titania nanotubes were tested in aqueous electrolyte as a potential electrode material for energy storage devices. The nanotubular morphology of TiO₂ was obtained by Ti anodization. TiO₂ nanotubes were covered by a thin layer of bismuth vanadate using pulsed laser deposition. The formation of the TiO₂/BiVO₄ junction leads to enhancement of pseudocapacitance in the cathodic potential range. The third component, the conjugated polymer PEDOT:PSS, was electrodeposited from an electrolyte containing the monomer EDOT and NaPSS as a source of counter ions. Each stage of modification and deposition affected the overall capacitance and allowed for an expansion of the potential range of electroactivity. Multiple charge/discharge cycles were performed to characterize the electrochemical stability of the inorganic–organic hybrid electrode. Capacitance values higher than 10 mF·cm⁻² were maintained even after 10000 galvanostatic cycles (i_c = i_a = 0.5 mA·cm⁻²).

【 授权许可】

CC BY