Single Cobalt Atom and N Codoped Carbon Nanofibers as Highly Durable Electrocatalyst for Oxygen Reduction Reaction
Single Cobalt Atom and N Codoped Carbon Nanofibers as Highly Durable Electrocatalyst for Oxygen Reduction Reaction
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单钴原子和氮共掺杂碳纳米纤维作为氧还原反应的高耐用电催化剂
DOI：
10.1021/acscatal.7b02326
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发表时间：
2017-10-01
期刊：
影响因子：
12.9
通讯作者：
Yang, Hui
中科院分区：
文献类型：
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作者：
Cheng, Qingqing;Yang, Lijun;Yang, Hui
过渡金属和氮共掺杂的碳基（TM-N/C）催化剂是催化氧还原反应（ORR）的有希望的候选者。然而，TM-N/C催化剂存在ORR活性不足、活性中心结构不清楚和耐久性差的问题，特别是在酸性溶液中。在此，我们报告了单Co原子和N共掺杂的碳纳米纤维（Co-N/CNFs）催化剂，其在酸性和碱性溶液中具有高耐久性和理想的ORR活性。ORR的半波电位在10 000次循环加速耐久性试验后显示可忽略不计的降低。探测分析和密度泛函理论计算表明，高ORR耐久性源于原子分散的Co基活性中心的结构稳定性。以该材料为阴极的被动式直接甲醇燃料电池在200 h的测试中，最大功率密度为16 mW cm-2，稳定性良好，显示了该材料的应用潜力。高科技的突破…
Transition-metal and nitrogen-codoped carbon-based (TM-N/C) catalysts are promising candidates for catalyzing the oxygen reduction reaction (ORR). However, TM-N/C catalysts suffer from insufficient ORR activity, unclear active site structure, and poor durability, particularly in acidic solution. Herein, we report single Co atom and N codoped carbon nanofibers (Co–N/CNFs) catalyst with high durability and desirable ORR activity in both acidic and alkaline solutions. The half-wave potential of the ORR shows a negligible decrease after a 10 000-cycle accelerated durability test. The high ORR durability is originated from the structural stability of the atomically dispersed Co-based active site, as revealed by probing analysis and density functional theory calculations. A passive direct methanol fuel cell with the Co–N/CNFs cathode delivers a maximal power density of 16 mW cm–2 and a remarkable stability during a 200 h test, demonstrating the application potential of Co–N/CNFs. The breakthrough of the highly ...