Electrochemical synthesis of polyaniline cross-linked NiMoO₄ nanofibre dendrites for energy storage devices

Abstract

Electrochemical synthesis of polyaniline deposited on a graphite electrode using ptoluenesulfonic acid has been carried out via potentiodynamic method. The feasibility to store energy in polyaniline has been demonstrated in 1 M Na 2 SO 4 electrolyte using cyclic voltammetry and charge-discharge analyses. The obtained low capacitance (247 mF cm -2 ) for polyaniline limits its practical application. Thereon, as an alternative approach, aniline is polymerized in the presence of novel non-ionic surfactant (Quillaja Saponin) and found a marginal increase in capacitance to 342 mF cm -2 . Adsorption of surfactant on aniline resulted in a profound effect on electrochemical behaviour. To further enhance the capacitance, innovatively, polyaniline is cross-linked with nickel molybdate (NiMoO 4 ) using chitosan as biopolymer. The cross-linked NiMoO 4 showed an improved areal specific capacitance of 1250 mF cm -2 and 85% of its initial capacitance is retained after 2000 cycles. The morphology of the cross-linked NiMoO 4 deduced through field emission scanning and transmission electron microscopes showed the formation of nanofibre like dendrite having porous network. The intra molecular interactions that facilitate the electron transfer path with more active sites for nucleation are attributed to higher capacitance. X-ray photoelectron spectroscopy measurements ascertain the presence of NiMoO 4 in the aniline composite after electropolymerization process. Overall, the role of surfactant exhibited the surface functionality whereas biopolymer tuned the redox reactions of NiMoO 4 electrode.An effective cross-linking strategy for grafting polyaniline with a nanomaterial such as nickel molybdate provides long term cyclability in the fabricated energy storage device.

Improving the Electrochemical Performance of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 by Enlarging the Li Layer Spacing

“…The valence states of Li, Mn and Co are +1, +3 and +4, respectively, in both the pristine and Na‐doped samples, as determined by comparing the measured and theoretical data for these elements. These results are consistent with previous results reported in the literature ,. From the XPS analysis, it can be concluded that the valences of Ni, Mn and Co in the pristine and Na‐doped materials are the same, suggesting that Na doping into the Li + sites does not affect the oxidation states of Ni, Mn and Co in LiNi 0.8 Co 0.1 Mn 0.1 O 2 materials.…”

Dice-Like Nanostructure of a CuS@PbS Composite for High-Performance Supercapacitor Electrode Applications

“…(1), the specific capacitance of the CuS@PbS composite was 1004. 22 4, and 27.14 F g −1 , respectively. The specific capacitance decreased gradually with increasing current density from 2.85 to 14.28 A g −1 due to the resistance of the electrode and insufficient faradaic redox reaction at high current densities (Figure 6d) [32].…”

Highly Sensitive Electrochemical Sensing Platform for the Detection of L-dopa Based on Electropolymerizing Glutathione Disulfide and Multi-walled Carbon Nanotube-modified Electrodes

“…[18][19][20][21] Thus, the material in combination with MWCNTs and conductive polymer is promising for the detection of L-dopa. 22,23 Glutathione disulfide (GSSG) is a tripeptide with a gamma peptide linkage between the carboxyl group of the glutamate side-chain and the amine group of cysteine. It can be electropolymerized on the surface of GCE to promote electron transfer.…”