Aqueous Zn‐ion batteries own great potential on next generation wearable batteries due to the high safety and low cost. However, the uncontrollable dendrites growth and the negligible subzero temperature performance impede the batteries practical applications. Herein, it is demonstrated that dimethyl sulfoxide (DMSO) is an effective additive in ZnSO4 electrolyte for side reactions and dendrites suppression by regulating the Zn‐ion solvation structure and inducing the Zn2+ to form the more electrochemical stable (002) basal plane, via the higher absorption energy of DMSO with Zn2+ and (002) plane. Moreover, the stable reconstructed hydrogen bonds between DMSO and H2O dramatically lower the freezing point of the electrolyte, which significantly increases the ionic conductivity and cycling performance of the aqueous batteries at subzero temperatures. As a consequence, the symmetrical Zn/Zn cell can be kept stable for more than 2100 h at 20 °C and 1200 h at −20 °C without dendrite and by‐products formation. The Zn/MnO2 batteries can perform steadily for more than 3000 cycles at 20 °C and 300 cycles at −20 °C. This work provides a facile and feasible strategy on designing high performance and dendrite free aqueous Zn‐ion batteries for various temperatures.

Zinc (Zn) metal anode has been widely evaluated in aqueous Zn batteries. Nevertheless, the dendrite formation issue and consecutive side reactions severely impede the practical applications of Zn metal at high current densities. Herein, it is reported that engineering the gel electrolyte with multifunctional charged groups by incorporating a zwitterionic gel poly(3-(1-vinyl-3-imidazolio) propanesulfonate) (PVIPS) can effectively address the abovementioned issues. The charged groups of sulfonate and imidazole in the gel electrolyte can texture the Zn 2+ nucleation and deposition plane to (002), which possesses a high activation energy to resist side reactions and induce uniform growth of Zn metal for a dendrite-free structure. In addition, the Zn 2+ solvation structure can be manipulated by the charged groups to further eliminate side reactions for high rate performance Zn batteries. Consequently, the polyzwitterionic gel electrolyte enables a stable cycling with a cumulative capacity of 3000 mA h cm −2 at high density of 7.5 mA cm −2 for the symmetrical Zn battery, and a long-term cycling life for more than 1000 cycles at 5 C of Zn/MnO 2 full battery. It is envisioned that the design of the gel electrolyte will provide promising feasibility on safe, flexible, and wearable energy storage devices.

Advanced aqueous batteries are promising for next generation flexible devices owing to the high safety, yet still requiring better cycling stability and high capacities in wide temperature range. Herein, a polymeric acid hydrogel electrolyte (PAGE) with 3 M Zn(ClO4)2 was fabricated for high performance Zn/polyaniline (PANI) batteries. With PAGE, even at −35 °C the Zn/Zn symmetrical battery can keep stable for more than 1 500 h under 2 mA cm−2, and the Zn/PANI battery can provide ultra‐high stable specific capacity of 79.6 mAh g−1 for more than 70 000 cycles at 15 A g−1. This can be mainly ascribed to the −SO3−H+ function group in PAGE. It can generate constant protons and guide the (002) plane formation to accelerate the PANI redox reaction kinetics, increase the specific capacity, and suppress the side reaction and dendrites. This proton‐supplying strategy by polymeric acid hydrogel may further propel the development of high performance aqueous batteries.

A water-stable metal–organic framework exhibits multiresponsive fluorescence sensing for Fe(iii), Cr(iii/vi), and Mn(vii) ions and the organochlorine pesticide 2,6-Dich-4-NA in aqueous solution.

The large-scale use of pesticides such as organophosphates pesticides (OPPs) and organochlorines pesticides (OCPs) has led to serious environmental problems worldwide, and their high toxicity could cause serious damage to...