Zn-PANI aqueous electrolyte secondary batteries have many advantages, such as low price and free of pollution, but some shortcomings still exist, for example, over-charge electrochemical degradation of the PANI, Zn passivation and Zn dendrite, especially current collector of PANI electrode is corroded easily. So far, how to overcome the many inherent questions of Zn-PANI secondary batteries is still a hot topic. Herein, an efficient strategy is proposed by increasing the electroactivity of current collector by potentiostatic deposition of poly (aniline-co-5-aminosalicylic acid) (PAASA) on graphite paper (PG, an excellent corrosion-resistant, low-cost, good conductivity, soft, elastic and light material) for collecting current. To study the electroactivity of the PAASA, cyclic voltammograms and electrochemical impedance spectra of PAASA cathode and Zn anode are measured in aqueous solution containing NH 4 Cl and ZnCl 2 . The electrochemical performances show that the specific capacity of the Zn-PAASA aqueous battery is 145 mAh g -1 , which is far beyond that conventional Zn-PANI aqueous batteries under the same conditions, and retains 95 mAh g -1 of the capacity after 150 cycles. Thus, the Zn-PAASA secondary batteries may become the next generation of high-performance battery by further research.
The electrochemical behavior of zinc and polyaniline (PANI) obtained by the oxidative polymerization of aniline in 1.0 M aqueous HC1 by (NH 4 ) 2 S 2 O 8 were investigated in ZnCl 2 + NH 4 Cl (chloride electrolyte), (NH 4 ) 2 SO 4 + ZnSO 4 (sulfuric acid electrolyte), and (NH 4 ) 2 SO 4 + ZnSO 4 + (CH 3 COO) 2 Pb ( acetic acid electrolyte) with the addition of Na-citrate and Na-malonate. Compared with sulfuric acid electrolyte and acetic acid electrolyte, zinc electrode shows the minimum of charge transfer resistance (R ct ) and lower corrosion current densities, and polyaniline (PANI) keep high electrochemical activity in the chloride electrolyte at pH 4.0. The formation of zinc dendrite and the hydrogen evolution of the zinc electrode were suppressed in chloride electrolyte. The potentials were limited to 1.5 V for charge and to 0.7 V for discharge at 50 mA g -1 , obtained the initial discharge specific capacity of 109.5 mAh g -1 , the columbic efficiency remained at around 100% after 1000 times charge-discharge cycles.
Zinc is widely used as a negative electrode material for batteries due to its excellent electrochemical properties. Zinc is prone to corrosion and the formation of zinc dendrites cause short circuits of the battery, which leads to reduced battery capacity and shortens the battery's life, hindering its use in weak acidic electrolytes (for example, aqueous Zn-polyaniline batteries). The effects of carboxylates (sodium formate, sodium acetate, sodium propionate, sodium butyrate, sodium valerate, disodium malonate, and disodium succinate) and their concentrations on zinc electrode performance were studied with electrochemical methods to improve the zinc electrode activity for long-life Zn-polyaniline batteries. It was found that the ability of inhibiting corrosion of the zinc electrode is better in the aqueous electrolyte containing 0.2 M disodium malonate. The charge/discharge performance of a Zn-polyaniline battery electrodeposited with polyaniline on a carbon substrate is carried out in the aqueous electrolyte. the results show that the initial discharge specific capacity of the polyaniline in the Zn-polyaniline battery is as high as 131.1 mAh¨g´1, and maintains a discharge specific capacity of 114.8 mAh¨g´1 and a coulombic efficiency over 92% after 100 cycles at a charge/discharge current density of 1 A¨g´1 in the voltage range of 1.5-0.7 V.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.