Cobalt-nitrogen-doped ordered macro-/mesoporous carbon for highly efficient oxygen reduction reaction
Cobalt-nitrogen-doped ordered macro-/mesoporous carbon for highly efficient oxygen reduction reaction
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DOI：
10.1016/j.apcatb.2016.04.006
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发表时间：
2016-09
影响因子：
22.1
通讯作者：
Tingting Sun;Lianbin Xu;Shengyu Li;Wenxia Chai;Y. Huang;Yushan Yan;Jianfeng Chen
中科院分区：
文献类型：
--
作者：
Tingting Sun;Lianbin Xu;Shengyu Li;Wenxia Chai;Y. Huang;Yushan Yan;Jianfeng Chen
以二氧化硅胶体晶体（opal）为大孔模板，三嵌段共聚物Pluronic F127为介孔模板，采用双模板法一锅法制备了钴氮掺杂的三维有序大孔/介孔碳（Co-N-OMMCs）.在碱性介质中，Co-N-OMMC-0. 6催化剂的氧还原反应活性与市售的20 wt% Pt/C催化剂相当，但对甲醇的耐受性和耐久性更高。Co-N-OMMC-0.6的显着ORR电催化性能归因于丰富的Co-Nx活性位点的均匀分布，以及由有序的双连续介孔与3D互连的周期性大孔相结合的独特结构产生的大表面积和有效的质量/电荷传输。
Cobalt-nitrogen-doped three-dimensionally (3D) ordered macro-/mesoporous carbons (Co-N-OMMCs) have been fabricated through a dual-templating synthesis approach in a one-pot controllable procedure by the use of silica colloidal crystal (opal) as a macroporous mold and triblock copolymer Pluronic F127 as a mesoporous template. The optimal catalyst (Co-N-OMMC-0.6) exhibits comparable catalytic activity but much higher durability and tolerance of methanol in comparison with the commercial 20 wt% Pt/C catalyst for oxygen reduction reaction (ORR) in an alkaline medium. The remarkable ORR electrocatalytic performance of the Co-N-OMMC-0.6 is ascribed to the homogeneous distribution of abundant Co-Nxactive sites, as well as the large surface area and efficient mass/charge transport from the unique structure combining well-ordered bicontinuous mesopores with 3D interconnected periodic macropores.