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Corrosion behaviors of the porous alumina‐based ceramic core materials in KOH and NaOH solution were investigated. Corrosion tests were carried out at 100°C, 150°C, and 200°C, and the concentration of KOH and NaOH was 50, 67, and 75 wt%, respectively. The results indicated that the optimal concentration was 67 wt% for KOH solution and 50 wt% for NaOH solution, respectively. Increasing corrosion temperature and prolonging corrosion time were helpful to enhance the corrosion effect, and temperature played an extra important role during the whole corrosion process. NaOH solution was better than KOH solution for corrosion at the same temperature and concentration.

Graphene nanoplates (GNS) were prepared from oxided graphite by using thiosemicarbazide (CH5N3S) as a reducing agent. The microstructures and morphologies of products were subsequently characterized by XRD, FE-SEM, AFM and UV-Vis adsorption spectra. The performances of super-capacitor were characterized using cyclic voltammetry and constant current charge-discharge tests. The experimental results indicated that the as-prepared GNS possessed fair crystalline state and admirable aqueous dispersibility. An electrode prepared from GNS exhibited a specific capacitance of 75 F/g at a current density of 500 mA/g in 3 mol/L KOH electrolyte. Moreover, the GNS showed excellent electrochemical cycle performance

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