Confining MoS2 nanodots in 3D porous nitrogen-doped graphene with amendable ORR performance
Confining MoS2 nanodots in 3D porous nitrogen-doped graphene with amendable ORR performance
复制标题
将 MoS2 纳米点限制在 3D 多孔氮掺杂石墨烯中，并具有可修正的 ORR 性能
DOI：
10.1039/c5ta00648a
复制
发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Song, Wenbo
中科院分区：
文献类型：
--
作者：
Du, Cuicui;Huang, Hao;Song, Wenbo
通过原位裂解葡萄糖、层状C3N4牺牲模板和单层MoS2纳米点，成功地将MoS2纳米点嵌入到N掺杂石墨烯(NGR)的三维多孔骨架中。用水热法预合成了单层MoS2 NDS，并作为尺寸可控的前驱体。通过改变MoS2NDS的含量，得到了一系列MoS2NDS/NGR，由于MoS2NDS暴露的边缘位置与三维多孔NGR的内部导电通道之间的平衡，使得MoS2NDS/NGR在碱性溶液中对氧还原反应(ORR)具有可修饰的活性。在最佳组成条件下制备的无铂ORR催化剂具有良好的四电子选择性，其起始电势和峰电位都比相应的催化剂有更大的正移。新型催化剂还表现出了比商用铂/碳更好的耐甲醇能力和更好的耐久性。
MoS2 nanodots (NDs) were successfully embedded in the three-dimensional (3D) porous frameworks of N-doped graphene (NGr) via in situ pyrolysis of glucose, a layered C3N4 sacrificial template and monolayered MoS2 NDs. The monolayered MoS2 NDs were hydrothermally pre-synthesized and acted as size-controlled precursors. By varying the content of the MoS2 NDs, a series of MoS2 NDs/NGr was obtained, which displayed amendable activity towards oxygen reduction reaction (ORR) in basic solution, due to the balance between the exposed edge sites of the MoS2 NDs and the internal conductive channels of the 3D porous NGr. The optimal composition generated an efficient Pt-free ORR catalyst with good four-electron selectivity, and was shown to have a more positive shift in both the onset and peak potentials than its counterparts. The novel catalyst also demonstrated superior tolerance against methanol and better durability than commercial Pt/C.