采用氯化法制备石墨烯-无定型碳复合材料(GNS@a-C)，并用作质子交换膜燃料电池(PEMFC)氧还原反应Pt催化剂的载体.结果显示，所制Pt/GNS@a-C催化剂与传统商业催化剂Pt/C相比，有较好的活性和较高的稳定性：质量活性(0.121 A/mg)几乎是Pt/C (0.064 A/mg)的两倍.更重要的是，该新型催化剂加速4000圈后其电化学活性面积保留了最初的51%，与Pt/C的33%相比，前者有更好的电化学稳定性，显示它在PEMFC中将具有较好的应用潜力.
A core‐shell graphene nanosheets (GNS) and amorphous carbon composite (GNS@a‐C) was pre‐pared by a chlorination method and used as a highly efficient catalyst support for oxygen reduction reaction. Herein, GNS as a shell, with excellent conductivity, high surface area, and corrosion re‐sistance, served as a protecting coating to alleviate the degradation of amorphous carbon core. Platinum nanoparticles were homogeneously deposited on the carbon support (Pt/GNS@a‐C) and showed a good catalytic activity and a higher electrochemical stability when compared with a commercial Pt/C catalyst. The mass activity of Pt/GNS@a‐C catalyst was 0.121 A/mg, which was almost twice as high as that of Pt/C (0.064 A/mg). Moreover, Pt/GNS@a‐C retained 51%of its initial electrochemical specific area after 4000 operating cycles when compared with Pt/C (33%). Thus, the prepared catalyst featured excellent electrochemical stability, showing promise for application in polymer electrolyte membrane fuel cells.
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