N, F-Codoped Microporous Carbon Nanofibers as Efficient Metal-Free Electrocatalysts for ORR

Abstract

Highlights A new and facile method to synthesize N, F-codoped microporous carbon nanofiber (N, F-MCF) electrocatalysts via electrospinning, hydrothermal process, and thermal treatment. Polyvinylidene fluoride is applied as a fluorine source in oxygen reduction reaction (ORR) catalysis for the first time in literature. N, F-MCFs exhibit distinguished electrocatalytic activity, stability, and methanol tolerance for ORR in alkaline media. Electronic supplementary material The online version of this article (10.1007/s40820-019-0240-x) contains supplementary material, which is available to authorized users.

3D Carbon Materials for Efficient Oxygen and Hydrogen Electrocatalysis

“…Finally, halides have also been used as co‐dopants with N in metal‐free catalysts. Gong et al and Akula et al recently demonstrated N/F co‐doped carbons. Gong used electrospinning to produce CFs that can act as freestanding electrodes that showed similar performance to Pt/C in KOH (only a lower limiting current), as well as some activity in sulfuric acid.…”

“…The stability of the catalyst should be tested either in the form of their retention of activity after many cycles (upward of 10 000) or prolonged voltage holds (>1 00 00 s). Although tolerance to MeOH is often a metric that is used to assess the quality of metal‐free catalysts, it has become abundantly clear that heteroatom‐doped catalysts are not active for MeOH oxidation, and so do not suffer voltage loss due to MeOH crossover, exemplified by the majority of recent examples in the literature . It is apparent that this is now a largely meaningless metric for metal‐free catalysts, and all non‐PGM (Pt group metal) materials should be assumed to have good tolerance to MeOH cross‐over.…”

Hollow Nanocages of NixCo1−xSe for Efficient Zinc–Air Batteries and Overall Water Splitting

“…A three-electrode system was utilized in both HER and OER tests. Here, Ag/AgCl was used as the reference electrode [44][45][46], and C rod and C cloth electrodes were employed as the counter electrode and the working electrode, respectively. The catalyst ink was prepared as follows.…”

Atomic Layer Deposition-Assisted Construction of Binder-Free Ni@N-Doped Carbon Nanospheres Films as Advanced Host for Sulfur Cathode

“…Up to now, lots of carbon hosts (such as carbon nanofibers [16][17][18][19], reduced graphene oxides (rGO) [20,21], carbon nanotubes [18], and carbon nano/micron spheres [22]) have been prepared and combined with sulfur to obtain enhanced performance. It is verified that the conductive carbon host can not only reinforce the electrical conductivity of the whole composite electrode, but also exhibit good suppressing effect toward the soluble lithium polysulfides arising from the physical block/adsorption via micro-, meso-or macropores of carbon [23].…”