Cobalt oxide-coated N- and B-doped graphene hollow spheres as bifunctional electrocatalysts for oxygen reduction and oxygen evolution reactions
Cobalt oxide-coated N- and B-doped graphene hollow spheres as bifunctional electrocatalysts for oxygen reduction and oxygen evolution reactions
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氧化钴涂层 N 和 B 掺杂石墨烯空心球作为氧还原和析氧反应的双功能电催化剂
DOI：
10.1039/c6ta01349j
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发表时间：
2016-04
影响因子：
11.9
通讯作者：
Arumugam Manthiram
中科院分区：
文献类型：
--
作者：
Zhongqing Jiang;Zhong-Jie Jiang;Th;avarayan Maiyalagan;Arumugam Manthiram
开发了一种简单且可扩展的方法用于合成Co 3 O 4包覆的N-和B-掺杂的石墨烯空心球（Co 3 O 4/NBGHSs）。这些Co 3 O 4/NBGHS是高活性的氧还原和析氧反应，可以表现出更高的电催化活性和更好的耐久性比商业Pt/C和RuO 2/C，分别，证明他们是有效的双功能电催化剂。深入分析表明，Co 3 O 4与NBGHSs之间的耦合、与吸附O2的强相互作用、高电导率以及特殊的中空结构是赋予Co 3 O 4/NBGHSs较高电催化活性的重要原因。当作为锌-空气电池的阴极催化剂进行测试时，Co 3 O 4/NBGHS表现出比Pt/C催化剂和先前报道的其他催化剂更好的性能和更高的稳定性。这有力地表明，Co 3 O 4/NBGHS可以用作金属-空气电池的有效电催化剂，具有很大的潜力，以取代贵金属/碳基材料。
A simple and scalable method has been developed for the synthesis of Co3O4-coated N- and B-doped graphene hollow spheres (Co3O4/NBGHSs). These Co3O4/NBGHSs are highly active for both oxygen reduction and evolution reactions and can exhibit higher electrocatalytic activities and better durability than commercial Pt/C and RuO2/C, respectively, demonstrating them to be efficient bi-functional electrocatalysts. In-depth analysis shows that the coupling between Co3O4 and NBGHSs, strong interaction with adsorbed O2, high electric conductivity, and the specific hollow structure play important roles in imparting the higher electrocatalytic activities to the Co3O4/NBGHSs. When tested as cathode catalysts for Zn–air batteries, the Co3O4/NBGHSs exhibit better performance and higher stability than the Pt/C catalyst and other catalysts reported previously. This strongly suggests that the Co3O4/NBGHSs could be used as efficient electrocatalysts for metal–air batteries with great potential to replace precious metal/carbon based materials.
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