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

Silver phosphate (Ag 3 PO 4 ) 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 Ag 3 PO 4 , a facile method is to dope it with nitrogen. In this work, the nitrogen‐doped Ag 3 PO 4 material (N‐Ag 3 PO 4 ) was synthesized via the reaction of AgNO 3 with Na 2 HPO 4  ⋅ 12H 2 O in the presence of urea at 80 °C by means of liquid precipitation. Electrochemical analyses of the as‐synthesized N‐Ag 3 PO 4 composites were carried out in a three‐electrode geometry system. Results revealed that the doping of nitrogen could significantly improve the specific capacity of Ag 3 PO 4 . The highest specific capacity of 1314.9 F g −1 , which is more than twice that of the pure Ag 3 PO 4 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 Ω cm −2 ) of synthesized N‐Ag 3 PO 4 composites. These results suggest that the as‐prepared N‐Ag 3 PO 4 composite has great promise as a super capacitor energy storage material.