期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 285, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119780
关键词
Oxygen reduction; Single-atom catalyst; Cucurbit[6]uril; Holey matrix; Zn-air battery
资金
- National Key R&D Program of China [2017YFA0206800, 2017YFA0700100]
- NSFC [21520102001]
- Key Research Program of Frontier Science, CAS [QYZDJ-SSW-SLH045]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
This study reported the fabrication of M-N-C single-atom electrocatalysts using template-free method with CB[6] self-assembly, showing high activity and long-term stability in ZAB. The Fe-NHC catalyst exhibited better catalytic activity in alkaline condition compared to commercial Pt/C. This work offered a promising strategy to design stable and highly efficient catalyst for long-life electrochemical storage devices.
M-N-C single-atom electrocatalysts recently have received significant attention because of high catalytic activity and maximal atom utilization. Here, it is firstly reported that macrocycle cucurbit[6]uril (CB[6]) self-assembly was employed as precursor to fabricate M-N-C single-atom electrocatalysts for the Zn-air battery (ZAB). This template-free method using CB[6] self-assembly acquires the holey N-doped matrixes with hierarchical micro/mesoporous structure. The Fe loaded N-doped holey carbon single-atom electrocatalyst (Fe-NHC) exhibited high activity with the half-wave potential (E-1/2) of 0.89 V) versus reversible hydrogen electrode (RHE) for oxygen reduction reaction (ORR) in alkaline condition, which was better than those of Co or Ni loaded catalyst and commercial Pt/C (E-1/2 = 0.83 V). Moreover, the ZAB employing Fe-NHC catalyst achieved higher power and energy density with longer-term stability than those of Pt/C + Ir/C catalyst. This work provided a promising strategy to design stable and highly efficient catalyst for long-life electrochemical storage devices.
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