银基氧还原电催化剂具有较高的电催化活性且价格相对低廉，因而受到广泛关注. 本文采用简单、预先合成的石墨烯量子点作为载体和还原剂，制得了负载于石墨烯量子点、且无保护剂和表面活性剂的表面洁净银纳米粒子（Ag NPs/GQDs）. 电化学研究表明，Ag NPs/GQDs复合电催化剂的氧还原有较高的电催化活性，氧在碱性溶液中可经4电子途径还原为水. 与商业铂碳电极（Pt/C）相比，AgNPs/GQDs电极具有高催化电流密度、良好稳定性和极佳抗甲醇性能. 该银纳米粒子对开发高性能和低成本的非铂氧还原电催化剂有潜在的应用前景.

Silver-based catalysts have been extensively investigated as the platinum substituted catalysts due to their high catalytic efficiency, low cost and long-term durability. In this study, the surfactant-free silver nanoparticles supported on graphene quantum dots were synthesized through a facile approach without addition of any other protecting ligands and reducing agents. The “surface-clean” silver nanoparticles had remarkable electrocatalytic performance towards oxygen reduction reaction (ORR) with the most efficient four-electron transfer process. Compared with commercial Pt/C catalyst, the hybrid nanoparticles showed comparable catalytic performance for ORR but much higher tolerance to methanol. Such silver nanoparticles supported on graphene quantum dots may have promising applications in alkaline fuel cells as an efficient Pt-free catalyst with high catalytic performance and low cost.