Abstract
Designing the performance of artificial solid electrolyte interphase (ASEI) is critical for addressing issues at the Zn anode-electrolyte of aqueous zinc batteries (AZBs). Inspired by the anti-corrosion strategy of metal substrate, a self-doping sulfonated polyaniline (S-PANI) is constructed on the surface of zinc foil by a facile scraping method. The synergistic effect of nitrogen and sulfonic acid groups in S-PANI coating layer, accompanies microchannels in the polymer network is favorable for the fast Zn2+ ion transport, uniform and stable Zn deposition. As a result, the Zn anode with S-PANI coating can achieve high average coulombic efficiency of 98.0% over 150 cycles and superior cycling performance up to 1500 h at a 0.5 mA cm-2 and 0.5 mAh cm-2. Moreover, the full battery coupled with PTO organic cathode also demonstrates superior cycling stable performance. This work opens effective approach for the application of conductive polymer coating in Zn anode protection.
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