Dual-template induced multi-scale porous Fe@FeNC oxygen reduction catalyst for high-performance electrochemical devices

Shi, Jiawei, Shao, Hong, Yang, Feng, Li, Jing, Fan, Liyuan, and Cai, Weiwei (2022) Dual-template induced multi-scale porous Fe@FeNC oxygen reduction catalyst for high-performance electrochemical devices. Chemical Engineering Journal, 445. 136628.

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Abstract

The oxygen reduction reaction (ORR), as a key semi-reaction in various electrochemical conversions, was widely studied. The FeNC catalyst showed great potential to replace precious Pt as the ORR catalyst. The multi-scale porous structure was crucial for the catalytic activity of the FeNC catalyst due to the discrete distribution of active sites. Therefore, a dual-template strategy was developed using solid NaCl as the hard template and self-polymerized resin as the soft template to construct a smooth multi-scale porous FeNC (FeNC-DT) catalyst with embedded metallic Fe. The as-prepared catalyst exhibited a half-wave potential of 0.954 V vs. a reversible hydrogen electrode under alkaline conditions. The corresponding zinc-air battery and direct methanol fuel cell (DMFC) using FeNC-DT as the catalyst performed superior to the precious-metal-based catalysts in power density. Especially, the self-breathing DMFC achieved a maximum power of 23 mW/cm2, indicating a great application prospect of the FeNC-DT catalyst in actual electrochemical devices.

Item ID: 75440
Item Type: Article (Research - C1)
ISSN: 1873-3212
Keywords: Direct methanol fuel cell, Zinc-air battery, Oxygen reduction reaction, Multi-scale porous FeNC, Dual-template
Copyright Information: © 2022 Elsevier B.V. All rights reserved.
Date Deposited: 14 Jul 2022 02:34
FoR Codes: 40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion @ 70%
40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials @ 30%
SEO Codes: 17 ENERGY > 1704 Energy transformation > 170401 Fuel cells (excl. solid oxide) @ 100%
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