Graphitic carbon nitride nanosheet supported high loading silver nanoparticle catalysts for the oxygen reduction reaction

摘要

Ag/graphitic carbon nitride (Ag/g-C_3N_4) catalysts with high loading Ag are prepared using g-C_3N_4 by protonation. Ag~+ can combine with Cl~- on the surface of g-C_3N_4 nanosheet by protonation and further deoxidize by sodium citrate. It contributes to well disperse Ag nanoparticles on the surface of g-C_3N_4. In addition, Ag/g-C_3N_4 catalysts are also used for the oxygen reduction reaction (ORR) in alkaline solution. Compared with g-C_3N_4 and g-C_3N_4-H~+Cl~-, the Ag/g-C_3N_4 catalysts with 80 wt% Ag show excellent catalytic activity for ORR. The proposed catalyst is promising, facile and low-cost, and can be a potential candidate for application in alkaline fuel cells.