Crystalline carbon modified hierarchical porous iron and nitrogen co-doped carbon for efficient electrocatalytic oxygen reduction

A novel crystalline carbon modified hierarchical porous iron and nitrogen co-doped carbon (Fe-N/C) electrocatalyst with enhanced electronic conductivity is designed and prepared. The crystalline carbon provides a faster channel for electron transport in the oxygen reduction reaction, thereby enhanci...

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Veröffentlicht in:Journal of colloid and interface science 2021-07, Vol.594, p.864-873
Hauptverfasser: Sun, Shanfu, Yin, Zhiyuan, Cong, Bowen, Hong, Weizhao, Zhou, Xin, Wang, Yu, Wang, Yuanheng, Chen, Gang
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container_start_page 864
container_title Journal of colloid and interface science
container_volume 594
creator Sun, Shanfu
Yin, Zhiyuan
Cong, Bowen
Hong, Weizhao
Zhou, Xin
Wang, Yu
Wang, Yuanheng
Chen, Gang
description A novel crystalline carbon modified hierarchical porous iron and nitrogen co-doped carbon (Fe-N/C) electrocatalyst with enhanced electronic conductivity is designed and prepared. The crystalline carbon provides a faster channel for electron transport in the oxygen reduction reaction, thereby enhancing the electrocatalytic activity. [Display omitted] Hierarchical porous iron and nitrogen co-doped carbon (Fe-N/C) materials have been considered as an appealing non-noble metal-based catalyst in oxygen reduction reactions (ORR). However, the conductivity loss caused by the scattering of electrons on pores and defects markedly limits their catalytic activity, which attracted seldom attention in this area. Herein, a novel crystalline carbon modified hierarchical porous Fe-N/C electrocatalyst with enhanced electronic conductivity is designed and prepared via a two-step calcination-catalysis process. The resistivity of hierarchical porous Fe-N/C is decreased from 2.123 Ω cm to 0.479 Ω cm after crystalline carbon introduction. The electrocatalyst annealed at 800 °C (Fe-N/C-800) exhibits a superior activity with the half-wave potential (E1/2) of 0.89 V, which outperforms the commercial carbon-supported platinum (Pt/C) catalyst (0.85 V). The strategy of crystalline carbon modification provides a fresh approach to improve the electronic conductivity of porous carbon-based materials.
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subjects Conductivity
Crystalline carbon
Fe-N/C
Hierarchical porous structure
Oxygen reduction reaction
title Crystalline carbon modified hierarchical porous iron and nitrogen co-doped carbon for efficient electrocatalytic oxygen reduction
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