Department of Chemistry, State Key Lab of Molecular Engineering of Polymers and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University , Shanghai 200433, China.
ACS Appl Mater Interfaces. 2014 Oct 22;6(20):17654-60. doi: 10.1021/am503895w. Epub 2014 Oct 8.
To balance the anchoring sites and conductivity of the catalyst supports is a dilemma in electrocatalytic oxygen reduction reaction (ORR). Nitrogen-doped mesoporous graphene (N-MG) with large surface area, high porosity, and superior intrinsic conductivity has been developed to address this issue. Using N-MG as the backbone, a hybrid catalyst of Co3O4 nanocrystals embedded on N-MG (Co3O4/N-MG) was prepared for the electrocatalytic ORR in alkaline media. The Co3O4/N-MG showed high catalytic activity for the four-electron ORR, giving a more positive onset potential (0.93 V vs RHE) and a higher current density. The unique property of N-MG and the synergetic effect of Co3O4 and N-MG are prominent for ORR. With improved electrocatalytic activity and durability, the Co3O4/N-MG can be an efficient nonprecious metal catalyst and potentially used to substitute the platinum-based cathode catalysts in fuel cells and metal-air batteries.
在电催化氧还原反应（ORR）中，平衡催化剂载体的锚定位点和电导率是一个难题。具有大比表面积、高孔隙率和优异本征导电性的氮掺杂介孔石墨烯（N-MG）被开发出来以解决这个问题。以 N-MG 为骨架，制备了负载在 N-MG 上的 Co3O4 纳米晶的杂化催化剂（Co3O4/N-MG），用于碱性介质中的电催化 ORR。Co3O4/N-MG 对四电子 ORR 表现出高催化活性，具有更正的起始电位（0.93 V vs RHE）和更高的电流密度。N-MG 的独特性质和 Co3O4 与 N-MG 的协同效应在 ORR 中表现突出。由于具有改进的电催化活性和耐久性，Co3O4/N-MG 可以作为高效的非贵金属催化剂，并有可能替代燃料电池和金属-空气电池中的铂基阴极催化剂。
