文献类型：期刊文献

英文题名：FeCoN Co-doped Hollow Carbon Nanocage Grafted with Carbon Nanotubes as an Electrocatalyst for Enhanced Oxygen Reduction Reaction

作者：Cheng, Yunyun[1];Hu, Shuozhen[1];Luo, Guoming[1];Gao, Zhaoqun[1];Zhang, Xinsheng[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：6

期号：3

起止页码：2010

外文期刊名：ACS APPLIED ENERGY MATERIALS

收录：;EI(收录号：20230413446406);WOS:【SCI-EXPANDED(收录号:WOS:000931585200001)】；

基金：ACKNOWLEDGMENTS This work is financially supported by the National Key Research and Development Program of China (2020YFB1505704) and the National Natural Science Foundation of China (Project 22005097) . The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization. The authors would like to thank the shiyanjia lab ( www.shiyanjia.com ) for the XPS test.

语种：英文

外文关键词：FeCoN co-doped carbon catalyst; in situ doping; bimetallic organic framework; hierarchical hollow carbon nanocage; oxygen reduction reaction

摘要：Significantly maximizing the density of active sites while increasing the mass transfer rate of the catalyst is critical to increasing the activity toward oxygen reduction reaction (ORR). Herein, a Fe, Co, and N co-doped carbon catalyst in the form of hollow carbon nanocage grafted with carbon nanotubes (FeCo-HNC/CNT) was synthesized using a seed-mediated growth method with in situ doping strategy followed by one-step high-temperature pyrolysis without additional acid-etching or re-pyrolysis. Benefiting from the in situ doping of Fe(3+ )ions, the FeCo-HNC/CNT catalyst exhibited a relatively high content of active sites (MN), unique concave hollow structure, hierarchical pore structure, and in situ growth of carbon nanotubes. The utilization of active sites and mass transport within the carbon matrix are promoted. Remarkably, the FeCo-HNC/CNT catalyst exhibits significantly high activity with the onset potential (E-onset) of 1.060 V vs RHE and half-wave potential (E-1/2) of 0.902 V vs RHE in 0.1 M KOH solution. The stability is also enhanced with only 2.7 mV loss after 10,000 cycles of CV test. The ORR activity of the FeCo-HNC/ CNT catalyst (E-onset = 0.926 V vs RHE and E1/2 = 0.817 V vs RHE) is comparable to that of commercial Pt/C catalysts in 0.5 M H(2)SO(4 )solution. This work provides a facile and effective method to prepare an efficient bimetal-doped M-N-C carbon-based ORR electrocatalyst with a proper hierarchical porous structure.