期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 24, 页码 28324-28333出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c06750
关键词
transition metal-nitrogen-carbon (TM-N-C); oxygen reduction reaction (ORR); ZIF-on-ZIF strategy; synergistic effect; zinc-air battery (ZAB)
资金
- National Key Research and Development Program of China [2018YFB0104200]
- Key Project of Strategic New Industry of Hunan Province [2019GK2032]
- National Natural Science Foundation of China Youth Project [52003230]
- Excellent Postdoctoral Innovative Talents Project of Science and Technology Innovative Talents Program of Hunan Province [2020RC2075]
This study presents a facile and effective strategy to obtain highly efficient and stable transition metal-nitrogen-carbon (TM-N-C) nanomaterials as platinum-based substitutes for the oxygen reduction reaction (ORR) catalysts. By utilizing a multi-layer structure and multi-element co-doping, the material exhibits outstanding performance in 0.1M KOH, especially in terms of electrocatalysis and methanol tolerance.
Transition metal-nitrogen-carbon (TM-N-C) nanomaterials are promising platinum-based substitutes for the oxygen reduction reaction (ORR). However, large-scale commercial production of high-efficiency, durable TM-N-C catalysts remains a formidable challenge. In this work, a facile.ZIF-on-ZIF. strategy is first adopted to design ZIF-8@ZIF-67 core-shell polyhedral nanocages, and then, ferrocene (Fc) is added to form ZIF-8@ZIF-67@Fc double-layer encapsulating polyhedral nanocages. Finally, Zn, Co, and Fe tridoped N-C nanocages (ZnCoFe-N-C) as the high-efficiency ORR electrocatalyst are prepared through high-temperature annealing. Benefiting from the trimetal, nitrogen and carbon species bond to each other to form highly efficient active sites, and the material exhibits outstanding performance in 0.1 M KOH, onset potential and half-wave potential of up to 0.95 and 0.878 V (vs RHE), respectively, and long-term durability and methanol tolerance. Furthermore, when utilizing as a zinc-air battery (ZAB) air electrode, it exhibits wonderful indicators, reflected in an open circuit voltage of 1.525 V, power density of 350.2 mW cm(-2), and specific capacity of 794.7 mAh g(zn)(-1), which outperforms the benchmark Pt/C catalyst. This work provides a facile and effective strategy to obtain a highly efficient and stable TM-N-C electrocatalyst for the ORR in ZABs.
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