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#35973696   2022/08/16 To Up

A simple Preheating-pyrolysis Strategy Leading to Superior ORR Activity in Fe-N/Carbon black.

Maintaining high catalytic activity of oxygen reduction reaction (ORR) while reducing costs has been a long-standing effort to promote the application of polymer electrolyte fuel cells (PEFCs). Here, we enhanced the binding of nitrogen-containing ligands and carbon black by controlling the pyrolysis conditions of a FeSO , 1,10-phenanthroline (phen), carbon black mixture, which significantly improved the ORR catalytic activity of the pyrolysis products. We proposed the preheating as a process improvement method to use a heat treatment at a temperature between the melting and boiling points of phen before high-temperature pyrolysis, which achieved an effective combination of phen and carbon black, enhanced the interaction between phen and ferrous ions. This method substantially increased the number of FeN active centers in the pyrolysis product, resulting in an impressive Fe-N/C catalyst with half-wave potential (E ) up to 0.93 V and a diffusion-limited current density (j ) of 5.9 mA/cm and no obvious decay after 20000 cyclic voltammetry cycles in 0.1 M KOH, which are all among the best reported data to date. The interaction between the ratio of Fe/phen and the pyrolysis conditions was also investigated. Under the right conditions cheap raw materials can also generate highly catalytically active sites, all these advantages may provide promise for future applications. This article is protected by copyright. All rights reserved.
Chen Ouyang, Lirong Zheng, Qinghua Zhang, Xun Wang

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