Carbon nanotube-encapsulated cobalt for oxygen reduction: integration of space confinement and N-doping.

Qichen Wang, Ke Ye, Liang Xu, Wei Hu, Yongpeng Lei, Yi Zhang, Yin Chen, Kechao Zhou, Jun Jiang, Jean-Marie Basset, Dingsheng Wang, Yadong Li

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We report carbon nanotube-encapsulated cobalt as an efficient oxygen reduction electrocatalyst (onset potential of 0.94 V and half-potential of 0.84 V). Calculation results firstly reveal that Co protected by graphitic-N-doped carbon holds more negative charge (-1.22 eV) and has an energy barrier (0.56 eV) lower than that of pyridinic-N-doped carbon (-1.11 eV; 0.78 eV), which is responsible for the ORR activity. The corresponding Zn-air batteries deliver an excellent gravimetric energy density of 837 W h kg-1.
Original languageEnglish (US)
Pages (from-to)14801-14804
Number of pages4
JournalChemical communications (Cambridge, England)
Issue number98
StatePublished - 2019

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