Aqueous batteries have become a promising means of energy storage due to its environmental friendliness. Nevertheless, it often exhibits limited energy density that hinder their application. Considering that ammonium ion (NH4 +) has a low mass and a small hydration radius, aqueous ammonium ion batteries (AAIBs) are expected to solve the problem of low energy density. Herein, we obtain Vanadium dioxide/reduced graphene oxide aerogel (VOGA) by in-situ growth of VO2 on the graphene surface for interfacial electric field enhanced AAIBs to achieve high mass energy density. The VOGA free-standing electrode achieves a specific capacity of up to 655 mA g-1 at a current density of 0.5 A g-1. And the mass energy density of the VOGA.
Keywords: VO2/rGO aerogel; aqueous ammonium‐ion battery; free‐standing electrode; interfacial electric field; mass‐energy density.
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