Details

Autor(en) / Beteiligte

• Zhang, Wenwen
• Zhao, Ximeng
• Niu, Weixing
• Yu, Hang
• Wan, Tongtao
• Liu, Guihua
• Zhang, Dongsheng
• Wang, Yanji

Titel

ZIF-67-derived N-doped double layer carbon cage as efficient catalyst for oxygen reduction reaction

Ist Teil von

• Nanotechnology, 2022-02, Vol.33 (6), p.65409

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract The slow kinetic of oxygen reduction reaction (ORR) hampers the practical application of energy conversion devices, such as fuel cells, metal-air batteries. Here, an efficient ORR electrocatalyst consists of Co, Ni co-decorated nitrogen-doped double shell hollow carbon cage (Ni–Co@NHC) was fabricated by pyrolyzing Ni-doped polydopamine wrapped ZIF-67. During the preparation, polydopamine served as a protective layer can effectively prevent the aggregation of Co and Ni nanoparticles during the pyrolysis process, and at the same time forming a carbon layer to grow a double layer carbon cage. This unique hollow structure endows the catalyst with a high specific surface area as well as more exposed active sites. Also benefited from the synergistic effect between Ni and Co nanoparticles, the Ni–Co@NHC catalyst leads to an outstanding ORR performance of half-wave potential ( E 1/2 , 0.862 V), outperforms that of commercial Pt/C catalyst. Additionally, when Ni–Co@NHC was used in the cathode for the zinc-air battery, the cell exhibits high power density (108 mW cm −2 ) and high specific capacity (806 mAh g −1 ) at 20 mA cm −2 outperforming Pt/C. This work offers a promising design strategy for the development of high-performance ORR electrocatalysts.