Edge-Functionalized Polyphthalocyanine Networks with High Oxygen Reduction Reaction Activity
2020
Yang, Shaoxuan | Yu, Yihuan | Dou, Meiling | Zhang, Zhengping | Wang, Feng
Two-dimensional (2D) conjugated aromatic networks (CAN) have been fabricated by ball milling of polymeric cobalt phthalocyanine precursors edge-functionalized with different aromatic acid anhydride substituents. The optimal CAN, obtained by using tetraphenylphthalic anhydride, consists of uniform and thin (2.9 nm) layers with a high BET surface (92 m² g–¹), resulting in well-defined Co–N₄ active sites with a high degree of exposure. Thence, this material exhibits excellent electrocatalytic oxygen reduction reaction (44 mA mgcₐₜ.–¹). Compared to a benchmark Pt/C catalyst, this value denotes 1.2- and 6.0-fold enhancements, respectively, in terms of the mass of Pt and total Pt/C. When utilized as air electrode catalysts in Zn–air batteries, this material provides a maximum areal power density (137 mW cm–²) and mass power density (0.68 W mgcₐₜ.–¹), values which also clearly surpass those of benchmark Pt/C catalyst. This support-free and pyrolysis-free strategy developed in this work delivers a novel route for the applications of 2D materials in clean energy conversion and storage.
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