Exceptionally high OER & HER performances were achieved by rationally designing the electrode structure of non-noble NiFe materials.

Zinc ion batteries (ZIBs) have attracted extensive attention in recent years, benefiting from their high safety, eco-friendliness, low cost, and high energy density. Although many cathode materials for ZIBs have been developed, the poor stability of zinc anodes caused by uneven deposition/stripping of zinc has inevitably limited the practical application of ZIBs. Herein, we report a highly stable 3D Zn anode prepared by electrodepositing Zn on a chemically etched porous copper skeleton. The inherent excellent electrical conductivity and open structure of the 3D porous copper skeleton ensure the uniform deposition/stripping of Zn. The 3D Zn anode exhibits reduced polarization, stable cycling performance, and almost 100% Coulombic efficiency as well as fast electrochemical kinetics during repeated Zn deposition/stripping processes for 350 h. Furthermore, full cells with a 3D Zn anode, ultrathin MnO 2 nanosheet cathode, and Zn 2+ -containing aqueous electrolyte delivered a record-high capacity of 364 mAh g −1 at a current density of 0.1 A g −1 and good cycling stability with a retained capacity of 173 mAh g −1 after 300 charge/discharge cycles at 0.4 A g −1 . This work provides a pathway for developing high-performance ZIBs.

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Eine wiederaufladbare Zinkionenbatterie wird vorgestellt, die als ein ideales wässriges Energiespeicherelement dient. Die Batterie zeichnet sich durch eine hohe Kapazität, schnelle Ladung/Entladung, Sicherheit und Umweltfreundlichkeit aus. Sie besteht aus einer α‐MnO2‐Kathode, einer Zinkanode und einem milden wässrigen ZnSO4‐ oder Zn(NO3)2‐Elektrolyten. Der Batterievorgang beruht auf der Wanderung von Zn2+‐Ionen zwischen Kathode und Anode.

Rechargeable aqueous Zn metal batteries hold exciting promise for next-generation grid-scale energy storage owing to their virtues of low cost, high safety, and eco-benignity. However, the detrimental corrosion and dendrite...

The extremely low room-temperature ionic conductivity of solid-state polymer electrolytes (SPEs) ranging from 10-7 to 10-5 S cm-1 seriously restricts their practical application in solid-state lithium metal batteries (LMBs). Herein,...

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Aqueous zinc batteries, that demonstrate high safety and low cost, are considered promising candidates for large‐scale energy storage. However, Zn anodes suffer from rapid performance deterioration due to the severe Zn dendrite growth and side reactions. Herein, with a low‐cost ammonium acetate (NH4OAc) additive, a self‐regulated Zn/electrolyte interface is built to address these problems. The NH4+ induces a dynamic electrostatic shielding layer around the abrupt Zn protuberance to make the Zn deposition uniform, and the OAc− acts as an interfacial pH buffer to suppress the proton‐induced side reactions and the precipitation of insoluble by‐products. As a result, in the electrolyte with the NH4OAc additive, Zn anodes exhibit a long cycling stability of 3500 h at 1 mA cm−2, an impressive cumulative areal capacity of 5000 mAh cm−2 at 10 mA cm−2, and a high Coulombic efficiency of ≈99.7%. A prototype full cell coupled with a NH4V4O10 cathode performs much better in terms of capacity retention than the additive‐free case. The findings pave the way for developing practical Zn batteries.