Oxygen reduction characteristics of bamboo-shaped, multi-walled carbon nanotubes without nitrogen in acid media

Matsubara, Kenji; Waki, Keiko

doi:10.1016/j.electacta.2010.08.040

Cited by 22 publications

(16 citation statements)

References 33 publications

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“…[20a] As shown in Figure 2e, many nanosized holes on basal graphene could be seen in HRTEM image. [34] From the monochromated TEM and HAADF images, we can clearly see the holes and edges of the main sample existing from the outer walls to the center. To verify the universality of introducing adequate defects by plasma treatment, few-layer carbon nanotubes were also introduced and obvious cracks on the tubular structure could be observed (Figure 2f).…”

Section: Dopant-free Carbon Materialsmentioning

confidence: 96%

“…Similar result was reported in Waki's work where multi-walled carbon nanotubes with hole defects on the walls were synthesized by strong acid treatment of annealed nanotubes and followed chemical drilling though Co impregnation ( Figure 2g). [34] From the monochromated TEM and HAADF images, we can clearly see the holes and edges of the main sample existing from the outer walls to the center. For edge defects, Shui et al unzipped the outer walls of multiwall carbon nanotubes (MWCNTs) to achieve zigzag-edges, [35] the great performance for ORR of which was demonstrated by extensive researches.…”

Section: Dopant-free Carbon Materialsmentioning

confidence: 96%

“…[13c] In this work, sticky rice was taken as biomass carbon source because the gelatinized rice can bond strongly with inorganic Mg(OH) 2 template as well as permeate uniformly. [34] Copyright 2014, Royal Society of Chemistry. d) Schematic illustration of the preparation of defective graphene by plasma treating.…”

Section: Mono-atom Dopingmentioning

confidence: 99%

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Recent Progress in Defective Carbon‐Based Oxygen Electrode Materials for Rechargeable Zink‐Air Batteries

Wang

Jiang

2019

Batteries & Supercaps

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In recent years, rechargeable Zn-air batteries put forward higher requirements on oxygen electrode materials in terms of their bifunctional properties, stability, and economic cost. As an eligible candidate, defective carbon-based nanomaterials have attracted considerable attention since substantial progresses in oxygen evolution reaction and/or oxygen reduction reaction have been reported sequentially. This review briefly summarizes the recent advancements towards defective carbon-based oxy-gen electrode materials, mainly focusing on the structuredesigning strategies and characterization techniques of active centers, as well as the understanding of structure-property relationships by the combination of experimental result and theoretical calculation for rechargeable Zn-air batteries. Besides, the current challenges and opportunities in high-performance carbon electrodes are discussed with an emphasis on future probable solutions.

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Section: Dopant-free Carbon Materialsmentioning

confidence: 96%

Section: Dopant-free Carbon Materialsmentioning

confidence: 96%

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Recent Progress in Defective Carbon‐Based Oxygen Electrode Materials for Rechargeable Zink‐Air Batteries

Wang

Jiang

2019

Batteries & Supercaps

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“…[12][13][14][15][16]24 n = 4I d /(I d + I r /N ) [ 1 ] where I d is the faradaic current at the disk, I r is the faradaic current at the ring, and N is the RRDE collection efficiency, N = 0.37.…”

Section: Methodsmentioning

confidence: 99%

“…7-11 For example, researchers have paid close attention to multi-walled carbon nanotubes (MWCNTs) doped with heteroatom, such as nitrogen, sulfur, phosphorus and boron, and consider them as the most promising "metal-free" ORR catalysts. [12][13][14][15][16] Furthermore, studies have been conducted to elucidate the ORR characteristics of MWCNTs under acid 17-19 and alkaline 20-22 conditions. For instance, Britto et al confirmed that unpurified MWCNTs, prepared using the arc discharge method, demonstrated a well-defined peak at −0.31 V (vs. SCE) for the ORR in H 2 SO 4 (pH = 2) solution.…”

mentioning

confidence: 99%

Electrocatalytic Performance of Carbon Nanotubes with Different Structure Parameters toward the Oxygen Reduction Reaction

Zhang

Deng

et al. 2015

ECS Electrochemistry Letters

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To evaluate the structure-characteristics-impact of carbon nanotubes (CNTs) on their electrocatalytic performance for oxygen reduction reaction (ORR), here, four types of CNTs with different inner diameter (ID), outer diameter (OD) and specific surface area (SSA) are investigated. Results indicate that CNTs with the ID of 5-10 nm, OD of 10-20 nm and SSA > 200 m 2 g −1 show the best electrocatalytic activity in alkaline solution, while in acid medium, it is the CNTs with the ID of 5-10 nm, OD of 20-30 nm and SSA > 110 m 2 g −1 . An electrochemical-chemical mechanism and the structure impact of CNTs on the ORR are discussed.Since the discovery of carbon nanotubes (CNTs) by Iijima in 1991, 1 they have become interesting materials due to their unique properties, such as excellent electronic conductivity and high chemical stability. These properties have resulted in the extensive exploitation of CNTs as support materials in heterogeneous catalysis and fuel cells, 2 energy storage materials, 3 electronic devices 4 and numerous other applications. 5,6 In proton exchange membrane fuel cell, intensive research efforts have been made to develop non-precious metal catalysts, especially metal-free catalysts, to replace Pt and Pt-based catalysts for the oxygen reduction reaction (ORR). 7-11 For example, researchers have paid close attention to multi-walled carbon nanotubes (MWCNTs) doped with heteroatom, such as nitrogen, sulfur, phosphorus and boron, and consider them as the most promising "metal-free" ORR catalysts. [12][13][14][15][16] Furthermore, studies have been conducted to elucidate the ORR characteristics of MWCNTs under acid 17-19 and alkaline 20-22 conditions. For instance, Britto et al. confirmed that unpurified MWCNTs, prepared using the arc discharge method, demonstrated a well-defined peak at −0.31 V (vs. SCE) for the ORR in H 2 SO 4 (pH = 2) solution. 17 Alexeyeva et al. reported that the electrocatalytic reduction of oxygen on untreated MWCNTs was noticeably better than on oxidationpretreated MWCNTs in 0.5 M H 2 SO 4 solution. 18 Recently, Waki et al. reported an alternative ORR electrocatalyst with defective holes formed from the outer walls to the center of carbon nanotubes. 11 The surface functional groups, especially the oxygen-containing groups, could significantly influence the ORR electrocatalytic activity and H 2 O selectivity. 23,24 For example, Zhong et al. reported the different effect of surface functional groups, such as carboxyl, carbonyl, hydroxyl and nitrogen-containing groups, on the ORR electrocatalytic activity of carbon nanofibers (CNFs) in alkaline solution. 23 Most recently, we found that the ORR electrocatalytic activity and H 2 O selectivity was MWCNTs-COOH > MWCNTs-OH > MWCNTs in acid solution, and MWCNTs > MWCNTs-COOH > MWCNTs-OH in alkaline medium. 24 In addition to the surface functional groups, other structure parameters, such as tube diameter, number of walls and specific surface area, which may also impact the electrocatalytic properties of CNTs, have not been considered in the...

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Dispersions of Hollow and Bamboo‐Like Multiwalled Carbon Nanotubes in Polyethyleneimine: Critical Analysis of the Preparation Conditions and Applications for Electrochemical Sensing

2014

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This work is focused on the critical analysis of the influence of the experimental conditions on the efficient dispersion of hollow‐type (hMWCNT) and bamboo‐like (bMWCNT) multiwall carbon nanotubes with polyethyleneimine (PEI). Spectroscopic and electrochemical studies demonstrated that the adequate combination of optimized ultracavitation and centrifugation is essential to obtain successful dispersions. The selected conditions were 1.0 mg mL−1 hMWCNT in 3.0 mg mL−1 PEI sonicated with a sonicator probe operating at 50 % of amplitude for 300 s and centrifuged at 9000 rpm for 15 min. Bamboo‐like multiwall carbon nanotubes were faster exfoliated and glassy carbon electrodes (GCE) modified with the resulting dispersion allowed the amperometric detection of hydrogen peroxide at lower potentials (0.100 V) with a detection limit of 5.5 µM.

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Oxygen reduction characteristics of bamboo-shaped, multi-walled carbon nanotubes without nitrogen in acid media

Cited by 22 publications

References 33 publications

Recent Progress in Defective Carbon‐Based Oxygen Electrode Materials for Rechargeable Zink‐Air Batteries

Recent Progress in Defective Carbon‐Based Oxygen Electrode Materials for Rechargeable Zink‐Air Batteries

Electrocatalytic Performance of Carbon Nanotubes with Different Structure Parameters toward the Oxygen Reduction Reaction

Dispersions of Hollow and Bamboo‐Like Multiwalled Carbon Nanotubes in Polyethyleneimine: Critical Analysis of the Preparation Conditions and Applications for Electrochemical Sensing

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