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Ultrathin cobalt phosphate (CoHPO4$3H2O) nanosheets are successfully?synthesized by a one pot hydrothermal method. Novel?CoHPO4$3H2O ultrathin nanosheets are assembled for constructing?the electrodes of supercapacitors. Benefiting from the nanostructures,the as-prepared electrode shows a specific capacitance of?413 F g1, and no obvious decay even after 3000 charge–discharge?cycles. Such a quasi-two-dimensional material is a new kind of
supercapacitor electrode material with high performance.