Oxygen reduction electrochemistry at F doped carbons: A review on the effect of highly polarized C-F bonding in catalysis and stability of fuel cell catalysts

催化作用 化学 杂原子 兴奋剂 碳纤维 电化学 无机化学 过渡金属 氧气 有机化学 材料科学 电极 复合材料 物理化学 戒指(化学) 光电子学 复合数
作者
Shaik Gouse Peera,Rahul S. Menon,Sumanta Kumar Das,Akram Alfantazi,K. Karuppasamy,Chao Liu,Akhila Kumar Sahu
出处
期刊:Coordination Chemistry Reviews [Elsevier BV]
卷期号:500: 215491-215491 被引量:22
标识
DOI:10.1016/j.ccr.2023.215491
摘要

Doped carbon materials, particularly N-doped carbon catalysts, have drawn considerable attention in recent years as metal-free catalysts for oxygen reduction reactions (ORR) and as a carbon corrosive resistance support for Pt and non-Pt nanoparticles. While nitrogen-doped carbons (N-doped carbons) were once the standard, F-doped carbons (F-doped carbons) have recently overtaken their popularity. This is because F doping gives carbon materials unique properties that not only differ from the N-doped carbons but also significantly improves the ORR activity and especially the durability. Being the highest electronegative element of the periodic table, F-doping can efficiently modify the electronic band structure of the carbon materials favoring for ORR. The edge F doping to the carbon is found to improve carbon corrosion resistance more than any other heteroatom doped catalyst discovered previously, including N doped carbons, both in highly acidic, alkaline pH conditions and high oxidative potentials that exists in the fuel cell including start-up and shut-down conditions. In this review, the fundamental understanding of effect of F-doping/F co-doping on the electrocatalytic reduction of O2 into H2O and OH− in acidic and alkaline pH conditions, effect of F doping on stability and durability of fuel cell catalysts, careful considerations/guidelines one needs to know before working with F doped carbons (F doping advantages vs. poisoning effect on Pt or M/F-C (M = transition metal) catalysts, are being reviewed systematically. Finally, several strategies for future research directions on F-doped carbons were proposed to bridge the gap between laboratory-scale assessment to commercial aspects.
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