Co2N nanoparticles embedded N-doped mesoporous carbon as efficient electrocatalysts for oxygen reduction reaction
Co2N nanoparticles embedded N-doped mesoporous carbon as efficient electrocatalysts for oxygen reduction reaction
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DOI：
10.1016/j.apsusc.2018.12.204
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发表时间：
2019-04-15
影响因子：
6.7
通讯作者：
Zhu, Yufang
中科院分区：
文献类型：
--
作者：
Guo, Dakai;Tian, Zhengfang;Zhu, Yufang
Co-N-C电催化剂在电催化氧还原反应领域受到了极大的关注。在这项工作中，我们提出了一种简单的方法来制备嵌入N掺杂介孔碳的Co2N纳米粒子，包括原位共聚和NH3气氛下的热解。结果表明，NH3热解可以在碳骨架中掺杂更多的N原子，热解温度和Co含量对样品的ORR性能也有影响。添加Co前驱体并在700℃下热解制备的样品具有较高的N含量(11.86at%)和较大的比表面积(362m(2)g(-1))，并且在E-起始(-0.038 V vs.SCE)、E-1/2(-0.126 V vs.SCE)和大电流密度(5.22 mA cm(-2))方面表现出优异的电催化ORR性能。此外，样品还表现出比铂/碳催化剂更好的稳定性和抗甲醇中毒能力。Co-N活性中心和多层孔结构的协同作用使其具有良好的电催化活性，被认为是全电池ORR的替代催化剂。
Co-N-C electrocatalysts have attracted great attention in electrocatalytic ORR (oxygen reduction reaction) field. In this work, we propose to prepare Co2N nanoparticles embedded N-doped mesoporous carbon by a facile method including in situ copolymerization and pyrolysis under NH3 atmosphere. The results show that more N atoms can be doped in carbon framework by NH3 pyrolysis, it is also found that pyrolysis temperature and Co content can influence the ORR performance of samples. The sample prepared by adding Co precursor and pyrolysis at 700 degrees C has high N content (11.86 at%) and relative large specific surface area (362 m(2) g(-1)), and it also exhibited superior electrocatalytic ORR performance in terms of E-onset (- 0.038 V vs. SCE), E-1/2 (- 0.126 V vs. SCE) and large current density (5.22 mA cm(-2)). Additionally, the sample also shows better stability and resistance to methanol poisoning than Pt/C catalyst. The synergistic effect of Co-N active centers and hierarchical porous structures contribute the excellent electrocatalytic activity, which are considering as alternative catalysts for ORR in full cells.