Nano Conductive Ceramic Wedged Graphene Composites as Highly Efficient Metal Supports for Oxygen Reduction

A novel conductive ceramic/graphene nanocomposite is prepared to prohibit the re-stacking of reduced graphene oxide (RGO) by wedging zirconium diboride (ZrB(2)) nanoparticles (NPs) into multiple layer nanosheets using a simple solvothermal method. Surprisingly, the RGO/ZrB(2) nanocomposite supported Pt NPs shows very excellent catalytic activity. Its electrochemical surface area (ECSA) is up to 148 m(2)g(−1) (very approaches the geometry surface area of 155 m(2)g(−1)), much greater than that of the previous report (usually less than 100 m(2)g(−1)). The mass activity is as high as 16.8 A/g(−1), which is almost 2 times and 5 times that of Pt/RGO (8.6 A/g(−1)) and Pt/C (3.2 A/g(−1)), respectively, as benchmarks. Moreover, after 4000 cycles the catalyst shows only 61% of ECSA loss, meaning a predominantly electrochemical stability. The remarkably improved electrochemical properties with much high Pt utilization of the new catalyst show a promising application in low temperature fuel cells and broader fields.