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- Title
Hierarchical N-Doped Porous Carbons for Zn–Air Batteries and Supercapacitors.
- Authors
Guo, Beibei; Ma, Ruguang; Li, Zichuang; Guo, Shaokui; Luo, Jun; Yang, Minghui; Liu, Qian; Thomas, Tiju; Wang, Jiacheng
- Abstract
Highlights: Hierarchical N-doped porous carbons (NPCs) with large surface area and controllable N-doping are synthesized by ball milling, followed by pyrolysis. As a Zn–air battery cathode, NPCs have comparable discharge performance to precious metal catalysts and more stability. NPCs also exhibit an excellent specific capacity and cycling stability when used as supercapacitor electrodes. Nitrogen-doped carbon materials with a large specific surface area, high conductivity, and adjustable microstructures have many prospects for energy-related applications. This is especially true for N-doped nanocarbons used in the electrocatalytic oxygen reduction reaction (ORR) and supercapacitors. Here, we report a low-cost, environmentally friendly, large-scale mechanochemical method of preparing N-doped porous carbons (NPCs) with hierarchical micro-mesopores and a large surface area via ball-milling polymerization followed by pyrolysis. The optimized NPC prepared at 1000 °C (NPC-1000) offers excellent ORR activity with an onset potential (Eonset) and half-wave potential (E1/2) of 0.9 and 0.82 V, respectively (vs. a reversible hydrogen electrode), which are only approximately 30 mV lower than that of Pt/C. The rechargeable Zn–air battery assembled using NPC-1000 and the NiFe-layered double hydroxide as bifunctional ORR and oxygen evolution reaction electrodes offered superior cycling stability and comparable discharge performance to RuO2 and Pt/C. Moreover, the supercapacitor electrode equipped with NPC prepared at 800 °C exhibited a high specific capacity (431 F g−1 at 10 mV s−1), outstanding rate, performance, and excellent cycling stability in an aqueous 6-M KOH solution. This work demonstrates the potential of the mechanochemical preparation method of porous carbons, which are important for energy conversion and storage.
- Subjects
SUPERCAPACITOR electrodes; OXYGEN evolution reactions; ALKALINE batteries; SUPERCAPACITORS; STANDARD hydrogen electrode; ELECTRIC batteries; ENERGY conversion; ZINC catalysts
- Publication
Nano-Micro Letters, 2020, Vol 12, Issue 1, pN.PAG
- ISSN
2311-6706
- Publication type
Article
- DOI
10.1007/s40820-019-0364-z