College of Science, Guilin University of Technology, Guilin 541004, PR China.
College of Science, Guilin University of Technology, Guilin 541004, PR China.
J Colloid Interface Sci. 2017 Dec 15;508:154-158. doi: 10.1016/j.jcis.2017.08.047. Epub 2017 Aug 16.
Nitrogen-doped graphene quantum dots (N-GQDs) exhibit exciting properties in the oxygen reduction reaction (ORR) for ample electrocatalytic edging and N-doped active sites. However, low yield and high dispersity of N-GQDs prohibit their direct application as the electrocatalyst. In this paper, two facile hydrothermal progress were developed to synthesize the high-yield N-GQDs with the diameter of ca. 2-6nm and the hybrid of N-GQDs/Reduced Graphene Oxide (N-GQDs/r-GO). The results demonstrated that the N-GQDs/r-GO display remarkable electrocatalytic activity. Moreover, it can be found that the pyridinic-N plays a major role in ORR. Both the average electron transfer number and the onset potential depend on the content of pyridinic-N. The proposed synthesis strategy is facile and low-cost, serving as a feasible method for the development of highly efficient electrocatalysts.
氮掺杂石墨烯量子点（N-GQDs）在氧还原反应（ORR）中表现出令人兴奋的性质，具有丰富的电催化边缘和氮掺杂活性位。然而，N-GQDs 的低产率和高分散性限制了它们作为电催化剂的直接应用。本文采用两种简便的水热法合成了高产率的 N-GQDs，其直径约为 2-6nm，并与还原氧化石墨烯（N-GQDs/r-GO）形成了混合物。结果表明，N-GQDs/r-GO 显示出显著的电催化活性。此外，可以发现吡啶-N 在 ORR 中起着主要作用。平均电子转移数和起始电位都取决于吡啶-N 的含量。所提出的合成策略简单且成本低廉，为开发高效电催化剂提供了一种可行的方法。
