Dual Activation for Tuning N, S Co-Doping in Porous Carbon Sheets Toward Superior Sodium Ion Storage.

Porous carbon has been widely focused to solve the problems of low coulombic efficiency (ICE) and low multiplication capacity of Sodium-ion batteries (SIBs) anodes. The superior energy storage properties of two-dimensional(2D) carbon nanosheets can be realized by modulating the structure, but be limited by the carbon sources, making it challenging to obtain 2D structures with large surface area. In this work, a new method for forming carbon materials with high N/S doping content based on combustion activation using the dual activation effect of KSO/KNO is proposed.

Advances in the regulation of kinetics of cathodic H/Zn interfacial transport in aqueous Zn/MnO electrochemistry.

Rechargeable aqueous Zn-MnO energy storage systems have attracted extensive attention owing to their high theoretical capacity and non-flammable mild aqueous electrolytes. Nevertheless, the complicated reaction mechanism of a MnO-based cathode severely restricts its further development. Therefore, it is crucial to clarify the kinetics of H/Zn interfacial transport in the MnO cathode for realizing controllable regulation of interfacial ion transport and then realizing high capacity and long lifespan.

Simultaneous reversible tuning of H and Zn coinsertion in MnO cathode for high-capacity aqueous Zn-ion battery.

Protons and zinc ions are generally regarded as charge carriers for rechargeable Zn/MnO batteries relying on cation coinsertion for their two-step redox energy storage. However, the irreversibility of H insertion and especially Zn insertion unlocks the innate advantages of this scalable aqueous battery system such as high safety and low cost. Herein, an encapsulated structure with manganese hexacyanoferrate(II)-polypyrrole (MnHCF-PPy) composite thin films was constructed within α-MnO nanofibers to modulate the interfacial charge transfer process and direct the consequent reversible H and Zn insertion/extraction a synergistic action.

Redox Catalysis Promoted Activation of Sulfur Redox Chemistry for Energy-Dense Flexible Solid-State Zn-S Battery.

In aqueous Zn-ion batteries, the intercalation chemistry often foil attempts at the realization of high energy density. Unlocking the full potential of zinc-sulfur redox chemistry requires the manipulation of the feedbacks between kinetic response and the cathode's composition. The cell degradation mechanism also should be tracked simultaneously.