Effect of surface bonding of FePC with electrospun carbon nanofiber on electrocatalytic performance for aprotic Li-O2 batteries

Tsou, Yung-Hao; Chuang, Yao-Yuan; Chen, Jenn‐Shing

doi:10.1016/j.jcis.2019.12.019

Cited by 47 publications

(20 citation statements)

References 53 publications

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“…Owing to the rich, porous structure of the carbon substrate and the π-π stacking effect between the precursors of the active sites (macrocyclic structure) and the graphene wall, numerous cobalt ligands (cobalt coupled with 1,10-phenanthroline) can be evenly and strongly adsorbed onto the inner wall of the nanopores ( Figure S1, Supporting Information). [23] After freeze-drying and rapid heat treatment under an inert atmosphere, cobalt clusters in carbon nanopores (denoted as Co/PC) can be prepared at the gram level in a one-pot synthesis ( Figure S2, Supporting Information). Moreover, by increasing the temperature and ultrasound energy during the adsorption stage, cobalt nanoparticles can be prepared from the carbon nanopores (denoted as Co@PC).…”

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confidence: 99%

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

et al. 2020

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electrocatalysts to improve their catalytic activity and stability, the realization of a stable and efficient ORR on air electrodes remains a challenge. [4] Generally, advanced metal-air fuel cells require high power output and robust stability. It is vital to build a stable triplephase reaction interface on the electrocatalyst to achieve a perfect balance among electron conduction, oxygen gas diffusion, and ion transportation. [5] However, the masking of active sites in the disorderly stacked electrocatalyst layer in a metalair fuel cell results in sluggish electron transfer. This phenomenon will greatly reduce the efficiency of electron and ion transport, leading to a distinct reduction in the power density. [6] Moreover, the fragile triple-phase interface is easily eroded by water under long-term high current discharging, thereby blocking the oxygen gas transport channel, and causing a significant decline in the stability of the Zn-air fuel cell. [7] To address these issues, the most common strategy is to mix the electrocatalyst and hydrophobic polymer to form a stable three-phase interface and gas transmission channel. In this case, excessive polymer addition greatly increases the reaction resistance and reduces the power density of the Zn-air fuel cell. [8-10] However, fabricating binder-free air electrodes by directly growing electrocatalysts on a conductive substrate can significantly enhance the electrical conductivity. Unfortunately, numerous catalytic sites will be eroded by water flooding in the long-term reaction Metal-air fuel cells with high energy density, eco-friendliness, and low cost bring significantly high security to future power systems. However, the impending challenges of low power density and high-current-density stability limit their widespread applications. In this study, an ultrahigh-power-density Zn-air fuel cell with robust stability is highlighted. Benefiting from the water-resistance effect of the confined nanopores, the highly active cobalt cluster electrocatalysts reside in specific nanopores and possess stable triple-phase reaction areas, leading to the synergistic optimization of electron conduction, oxygen gas diffusion, and ion transport for electrocatalysis. As a result, the as-established Zn-air fuel cell shows the best stability under high-current-density discharging (>90 h at 100 mA cm −2) and superior power density (peak power density: >300 mW cm −2 , specific power: 500 Wg cat −1) compared to most reported non-noble-metal electrocatalysts. The findings will provide new insights in the rational design of electrocatalysts for advanced metal-air fuel cell systems. Metal-air fuel cells are indispensable as next-generation energy storage systems because of their high energy density, eco-friendliness, and low cost. [1] However, the low power density and vulnerable stability of metal-air fuel cells seriously impede their large-scale applications. In particular, a highly efficient and stable power output will be indispensable for emergency backup power supply in future smart po...

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Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

et al. 2020

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“…Tsou et al. [ 157 ] used electrospinning to develop a strategy for supporting MMC with CNFs. First, nitrogen‐doped CNFs were prepared by electrospinning and two‐step annealing.…”

Section: Other Functionalized Nano‐carbon/mmc‐based Orr Catalystsmentioning

confidence: 99%

Molecular Control of Carbon‐Based Oxygen Reduction Electrocatalysts through Metal Macrocyclic Complexes Functionalization

Hong

Huang

et al. 2021

Advanced Energy Materials

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Owing to their zero pollution and high efficiency, fuel cells and metal–air batteries show great potential for broad application to sustainable energy technologies. However, the use of expensive and scarce Pt‐based materials as cathode catalysts to overcome the slow kinetics of oxygen‐reduction reaction (ORR) limits the scalability of such devices. Recently, considerable progress has been made in the development of nonprecious‐metal ORR catalysts. Although metal macrocyclic complexes (MMC) exhibiting a well‐defined M‐N4 (M = Fe, Co, Mn, Cu, etc.) structure (which can provide open sites to combine with oxygen and catalyze ORR) have attracted widespread attention, the MMC ORR performance is usually unsatisfactory because MCCs exhibit poor conductivity, symmetric electron distribution, inferior O2 adsorption, and low activation. However, MMC‐modified conductive‐carbon materials effectively solve such problems and simultaneously boost the ORR catalytic activity. In this review, the recent achievements in MMC‐functionalized carbon materials as ORR catalysts are summarized, and the current challenges and prospects of MMC‐functionalized carbon‐based ORR catalysts are discussed based on recent experimental and theoretical studies.

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“…the MeCN ligands in [Ru(bpy) 2 (MeCN) 2 ](OTf) 2 . 263 The method has been successfully used for the grafting of Mn, 264,265 Fe, [265][266][267][268][269] Co, 262,265 Ni, 265,270,271 Cu, 160,272,273 Zn, 103 Ru, 103,263,274,275 Rh 153,276 and Ir 263 complexes. Most of the corresponding ligands were anchored following two different approaches; namely, the direct reduction of their diazonium precursors or the reaction of the conveniently modified ligand, (through one of the other post-functionalization processes examined in this review), with a previously immobilized organic coating.…”

Section: Coordination Bondingmentioning

confidence: 99%

A post-functionalization toolbox for diazonium (electro)-grafted surfaces: review of the coupling methods

2021

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Effect of surface bonding of FePC with electrospun carbon nanofiber on electrocatalytic performance for aprotic Li-O2 batteries

Cited by 47 publications

References 53 publications

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

Nanopore Confinement of Electrocatalysts Optimizing Triple Transport for an Ultrahigh‐Power‐Density Zinc–Air Fuel Cell with Robust Stability

Molecular Control of Carbon‐Based Oxygen Reduction Electrocatalysts through Metal Macrocyclic Complexes Functionalization

A post-functionalization toolbox for diazonium (electro)-grafted surfaces: review of the coupling methods

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