Rechargeable aqueous hybrid Zn batteries (HZBs) have received increasing attention due to their low-cost, inherent safety, and green characteristics. However, it is still far from large-scale practical applications due to the absence of cathode materials with high-performance and stable structures. Here, Co 1.29 Ni 1.71 O 4 nanowires (NWs) are grown on nickel foam by a simple hydrothermal method. The Co 1.29 Ni 1.71 O 4 NWs exhibit reversible redox response and high catalytic activity for oxygen reduction reaction/oxygen evolution reaction due to a freestanding nanowire array structure, which effectively exposes active materials and provides abundant electrochemical active sites. Outstanding cycling stability can be achieved at 10 mA cm −2 over an ultralong life of ∼2127 h (88.6 days) for 6680 cycles with a specific discharge capacity of 168.3 mA h g −1 in KOH electrolytes. The assembled HZB with the Co 1.29 Ni 1.71 O 4 NWs delivers a flat and high discharge voltage plateau of ∼1.65 V with Coulombic efficiency of nearly 100% and excellent rate performance. This work may pave a new way to design and synthesize promising cathode materials for application in rechargeable aqueous HZBs.
In addition to their attractive technological applications in photovoltaics and light emitters, the perovskite family of semiconductors has recently emerged as an excellent excitonic material for fundamental studies. Specifically, the 2D hybrid organic-inorganic perovskite (HOIP) offers the added advantage of room temperature investigations owing to their large exciton binding energy. In this work, we strongly couple excitons in 2D HOIP crystals to planar microcavity photons sustaining exciton-polaritons under ambient conditions resulting in a Rabi splitting of 290 meV. Dark excitons directly pump the polariton branch along its dispersion in resonance with the Stokes shifted emission state (radiative pumping), creating a high density of polaritons at higher in-plane momentum (k||). We further probe the nonlinear polariton dispersion dynamics at varying input laser fluence, which indicates efficient polariton-polariton scattering and decay to k|| = 0 from higher k||. The observation of Stokes shift-assisted energy exchange of dark states with lower polaritons coupled with evidence of efficient polariton-polariton scattering makes 2D HOIPs an attractive platform to study exciton-polariton many-body physics and Bose-Einstein like condensation (BEC) at room temperature.
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