Naphthalene dianhydride organic anode for a ‘rocking-chair’ zinc–proton hybrid ion battery

Abstract

Rechargeable batteries consisting of a Zn metal anode and a suitable cathode coupled with a Zn2+ion-conducting electrolyte are recently emerging as promising energy storage devices for stationary applications. However, the...

Cu7Te4 as an Anode Material and Zn Dendrite Inhibitor for Aqueous Zn‐Ion Battery

“…[40] After that, Na 0.14 TiS 2 was reported with a potential of 0.3 V (vs Zn 2+ /Zn), a capacity of 140 mA h g −1 , and excellent cycling stability over 5000 cycles. [41] Recently, a series of anode materials, such as Mobased oxides, [42][43][44] Cu-based compounds, [45][46][47][48] Ti-based MXene and oxides, [49][50][51] polymers, [52,53] and tungsten oxide/carbide heterogeneous, [54] have been developed and successfully applied in "rocking-chair" Zn-ion batteries. These reported anode materials can suppress the Zn dendrite information by employing the intercalation reaction mechanism, but their higher discharge potentials (0.3-0.6 V vs Zn 2+ /Zn) and lower capacities (<200 mA h g −1 ) than Zn (≈0 V vs Zn 2+ /Zn; 824 mA h g −1 ) drastically reduce the energy density of aqueous Zn batteries.…”

Water-chain mediated proton conductivity in mechanically flexible redox-active organic single crystals

“…As a result, the charge storage in AZBs mostly follows a hybrid mechanism where the Zn 2+ ions compete with free protons generated from water in the aqueous electrolyte. 64 A similar mechanism is plausible for the Zn‖Azo-DPA-(N) cell, especially considering the high proton intake efficiency of the Azo-DPA compound, as evident from the three-electrode study (Fig. 3a and S19 †).…”

Proton storage chemistry in aqueous zinc‐organic batteries: A review

“…The protons participation in the charge compensation can be verified by inorganic salt by-product, namely zinc hydroxide sulfate with "x" crystalline water (Zn 4 (OH) 6 SO 4 ÁxH 2 O). 5,26,30,33,61,69,75,79,90 In the pristine mild aqueous ZnSO 4 electrolyte (pH = 4-5), the concentration of OH À (10 À9 -10 À10 M) is not high enough for the precipitation of Zn 2+ and SO 2À . However, accompanying with the consumption of H + during discharge process, the pH value of the electrolyte ascends due to the continuously accumulated OH À .…”

“…The protons participation in the charge compensation can be verified by inorganic salt by‐product, namely zinc hydroxide sulfate with “ x ” crystalline water (Zn 4 (OH) 6 SO 4 · x H 2 O) 5,26,30,33,61,69,75,79,90 . In the pristine mild aqueous ZnSO 4 electrolyte (pH = 4–5), the concentration of OH − (10 −9 –10 −10 M) is not high enough for the precipitation of Zn 2+ and SO 2− .…”