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Single Cobalt Atom and N Codoped Carbon Nanofibers as Highly Durable Electrocatalyst for Oxygen Reduction Reaction
ACS Catalysis ( IF 11.3 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1021/acscatal.7b02326 Qingqing Cheng 1, 2 , Lijun Yang 3 , Liangliang Zou 1 , Zhiqing Zou 1 , Chi Chen 1 , Zheng Hu 3 , Hui Yang 1
ACS Catalysis ( IF 11.3 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1021/acscatal.7b02326 Qingqing Cheng 1, 2 , Lijun Yang 3 , Liangliang Zou 1 , Zhiqing Zou 1 , Chi Chen 1 , Zheng Hu 3 , Hui Yang 1
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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 durable TM-N/C ORR catalyst could open an avenue for affordable and durable fuel cells.
中文翻译：
单钴原子和N共掺杂碳纳米纤维作为高度耐用的氧还原反应电催化剂
过渡金属和氮掺杂的碳基（TM-N / C）催化剂是催化氧还原反应（ORR）的有前途的候选物。但是，TM-N / C催化剂的ORR活性不足，活性位点结构不清楚，并且耐久性差，特别是在酸性溶液中。在本文中，我们报告了在酸性和碱性溶液中具有高耐久性和理想的ORR活性的单Co原子和N共掺杂碳纳米纤维（Co-N / CNFs）催化剂。在10000次加速耐久性试验后，ORR的半波电势下降几乎可以忽略不计。如探测分析和密度泛函理论计算所揭示的，高ORR耐久性源自原子分散的Co基活性位点的结构稳定性。–2和在200小时的测试中具有出色的稳定性，证明了Co–N / CNF的应用潜力。高度耐用的TM-N / C ORR催化剂的突破可以为可负担得起的耐用燃料电池开辟一条道路。
更新日期：2017-09-13
中文翻译：
单钴原子和N共掺杂碳纳米纤维作为高度耐用的氧还原反应电催化剂
过渡金属和氮掺杂的碳基（TM-N / C）催化剂是催化氧还原反应（ORR）的有前途的候选物。但是，TM-N / C催化剂的ORR活性不足，活性位点结构不清楚，并且耐久性差，特别是在酸性溶液中。在本文中，我们报告了在酸性和碱性溶液中具有高耐久性和理想的ORR活性的单Co原子和N共掺杂碳纳米纤维（Co-N / CNFs）催化剂。在10000次加速耐久性试验后，ORR的半波电势下降几乎可以忽略不计。如探测分析和密度泛函理论计算所揭示的，高ORR耐久性源自原子分散的Co基活性位点的结构稳定性。–2和在200小时的测试中具有出色的稳定性，证明了Co–N / CNF的应用潜力。高度耐用的TM-N / C ORR催化剂的突破可以为可负担得起的耐用燃料电池开辟一条道路。
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