Preparation of Nitrogen-doped Silver Phosphate and Its Performance of Supercapacitors

摘要

Silver phosphate (Ag3PO4) has been proved to be an excellent visible light catalyst. It also has a certain specific capacity, but if used as a supercapacitor anode material, its specific capacitance still needs to be further improved. To increase the specific capacity of Ag3PO4, a facile method is to dope it with nitrogen. In this work, the nitrogen-doped Ag3PO4 material (N-Ag3PO4) was synthesized via the reaction of AgNO3 with Na2HPO4 . 12H(2)O in the presence of urea at 80 degrees C by means of liquid precipitation. Electrochemical analyses of the as-synthesized N-Ag3PO4 composites were carried out in a three-electrode geometry system. Results revealed that the doping of nitrogen could significantly improve the specific capacity of Ag3PO4. The highest specific capacity of 1314.9 F g(-1), which is more than twice that of the pure Ag3PO4 specimen (656.1 F g(-1)), was obtained at the current density of 1 A g(-1). At a higher current density of 10 A g(-1), it possess a specific capacity of 716.6 F g(-1), showing an excellent charge/discharge performance, which could be attributed to the smaller particle size and the lower charge transfer resistance (0.41 omega cm(-2)) of synthesized N-Ag3PO4 composites. These results suggest that the as-prepared N-Ag3PO4 composite has great promise as a super capacitor energy storage material.