Enhanced electrochemical performance of Prussian blue analogues combined with 2D black phosphorus

Abstract

The design and tailoring of the cathode material for a supercapacitor are of enormous importance in achieving its high performance. A composite cathode material, composed of 2D BP coated on a 3D CoPBA, has been systematically developed and created through self-assembly using electrostatic adsorption. The structure and components of the CoPBA/BP composites were studied and analyzed using XRD, XPS, SEM, and TEM. The 2D BP wrappers can serve as conductive additives, facilitating charge transport and enhancing the electrochemical performance. The morphologies and electrochemical performances of CoPBA/BP were systematically investigated with increasing BP content. CoPBA-6BP is found to have a maximum specific capacitance of 755F/g at 1 A/g, which is 2.6 times greater than pure CoPBA. This makes the 2D/3D structured composite a strong candidate for cathode material applications.