Refining cocoon to prepare (N, S, and Fe) ternary-doped porous carbon aerogel as efficient catalyst for the oxygen reduction reaction in alkaline medium

Li, Changqing; Sun, Fengzhan; Lin, Yuqing

doi:10.1016/j.jpowsour.2018.01.020

Cited by 68 publications

(24 citation statements)

References 60 publications

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“…For a 4e ORR, I lim should be a fixed value in a particular concentration solution at 1600 rpm on a 5 mm working electrode, such as 5.277 mA cm −2 for 0.5 M H 2 SO 4 , 6.332 mA cm −2 for 0.1 M HClO 4 , and 5.968 mA cm −2 for 0.1 M KOH (The parameters were listed in support information). However, the experimentally measured I lim for 4e ORR are quite different among various literatures under the same experimental conditions, no matter on Pt/C catalysts or non‐noble metal catalysts, as shown in Figure . It is noteworthy that most measured I lim are lower than the theoretical value, and some are even only half of the theoretical value.…”

Section: Introductionmentioning

confidence: 68%

Effect of Experimental Operations on the Limiting Current Density of Oxygen Reduction Reaction Evaluated by Rotating‐Disk Electrode

Zhong

Liu

et al. 2020

ChemElectroChem

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The universal linear scan voltammogram measurement on the rotating disk electrode (RDE) has been identified as a simple method to investigate the oxygen reduction activity of electrocatalysts. The steady‐state limiting current density Ilim indicates the maximum diffusion current density in the oxygen reduction reaction (ORR) during RDE measurement, which should be a fixed value in theory for a 4e ORR in a particular concentration solution and at a certain rotate speed. However, in experiments, Ilim is always variable and smaller than theoretical value even though with the same the catalyst, electrode, and rotator. So the impact of various experimental operating parameters on Ilim is highly necessary to be investigated. In this paper, factors, such as catalyst loading, O2 inlet condition, O2 flow rate, gas tightness, solution concentration, and purity, have been investigated for their effects on the Ilim of ORR on three typical catalysts (20 % commercial Pt/C, Iron/Nitrogen/Carbon‐catalyst and N‐doped carbon nanotubes). The results indicate that the catalyst loading and O2 inlet condition are the key factors influencing the Ilim of ORR. While, the O2 flow rate, gas tightness, solution concentration, and purity have little influence on the Ilim of ORR. The correct Ilim could be obtained under the optimized catalyst loading and the O2 inlet with an extended sand core tube.

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Section: Introductionmentioning

confidence: 68%

Effect of Experimental Operations on the Limiting Current Density of Oxygen Reduction Reaction Evaluated by Rotating‐Disk Electrode

Zhong

Liu

et al. 2020

ChemElectroChem

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“…The CV curves of the CeO 2 @Fe,S,N−C NPs in O 2 and N 2 ‐saturated 0.1 M KOH aqueous solution were firstly collected to illustrate the catalytic properties of the sample, as shown in Figure a. No significant cathodic reduction peak is detected in the N 2 ‐saturated electrolyte, but a well‐defined cathodic peak emerges in the O 2 ‐saturated electrolyte, indicating the high sensitivity of CeO 2 @Fe,S,N−C towards ORR . The peak potential of CeO 2 @Fe,S,N−C is 0.87 V, equivalent or even higher than the measured values of other samples (Table and Figure S6), suggesting it has the pronounced activity.…”

Section: Resultsmentioning

confidence: 99%

CeO₂ Encapsulated by Iron, Sulfur, and Nitrogen‐Doped Carbons for Enhanced Oxygen Reduction Reaction Catalytic Activity

et al. 2020

ChemElectroChem

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The design and synthesis of highly stable, low‐cost electrocatalysts for the oxygen reduction reaction to supersede noble‐metal catalysts is critical for their application in the field of fuel cells. Herein, we report a facile approach for the synthesis of CeO2 encapsulated by iron, sulfur, and nitrogen‐doped carbon nanoparticles (CeO2@Fe,S,N−C NPs) by pyrolyzing CeO2@polypyrrole, which is obtained in the presence of sodium dodecylbenzene sulfonate as a surfactant and FeCl3 as an oxidant during the polymerization of pyrrole on the CeO2 surface. As Fe and S are effectively doped into the N‐doped carbon derived from polypyrrole, a large number of active sites are created, which greatly enhances the catalytic activity of the sample. The achieved sample displays excellent catalytic activity with an onset and halfwave potential of 0.924 V and 0.835 V, respectively, and a limiting current density of 5.45 mA cm−2 at the potential of 0.4 V vs. RHE. Moreover, it illustrates a high durability and strong methanol tolerance, endowing it with the prospect of applications in energy conversion.

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“…As a supporting material, carbon aerogel can supply a 3D porous and electrically conductive network for fast mass transport and electron transfer, and large surface area for the depositing and avoiding the ripening and aggregation of active particles . Besides, the carbon aerogels themselves can be used as functional materials through the defect design and heteroatom doping …”

Section: Preparation and Classification Of Aerogelsmentioning

confidence: 99%

Versatile Aerogels for Sensors

Yang

Zheng

et al. 2019

Small

101

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Aerogels are unique solid‐state materials composed of interconnected 3D solid networks and a large number of air‐filled pores. They extend the structural characteristics as well as physicochemical properties of nanoscale building blocks to macroscale, and integrate typical characteristics of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. These features endow aerogels with high sensitivity, high selectivity, and fast response and recovery for sensing materials in sensors such as gas sensors, biosensors and strain and pressure sensors, among others. Considerable research efforts in recent years have been devoted to the development of aerogel‐based sensors and encouraging accomplishments have been achieved. Herein, groundbreaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Moreover, the current challenges and some perspectives for the development of high‐performance aerogel‐based sensors are summarized.

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Refining cocoon to prepare (N, S, and Fe) ternary-doped porous carbon aerogel as efficient catalyst for the oxygen reduction reaction in alkaline medium

Cited by 68 publications

References 60 publications

Effect of Experimental Operations on the Limiting Current Density of Oxygen Reduction Reaction Evaluated by Rotating‐Disk Electrode

Effect of Experimental Operations on the Limiting Current Density of Oxygen Reduction Reaction Evaluated by Rotating‐Disk Electrode

CeO₂ Encapsulated by Iron, Sulfur, and Nitrogen‐Doped Carbons for Enhanced Oxygen Reduction Reaction Catalytic Activity

Versatile Aerogels for Sensors

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Refining cocoon to prepare (N, S, and Fe) ternary-doped porous carbon aerogel as efficient catalyst for the oxygen reduction reaction in alkaline medium

Cited by 68 publications

References 60 publications

Effect of Experimental Operations on the Limiting Current Density of Oxygen Reduction Reaction Evaluated by Rotating‐Disk Electrode

Effect of Experimental Operations on the Limiting Current Density of Oxygen Reduction Reaction Evaluated by Rotating‐Disk Electrode

CeO2 Encapsulated by Iron, Sulfur, and Nitrogen‐Doped Carbons for Enhanced Oxygen Reduction Reaction Catalytic Activity

Versatile Aerogels for Sensors

Contact Info

Product

Resources

About

CeO₂ Encapsulated by Iron, Sulfur, and Nitrogen‐Doped Carbons for Enhanced Oxygen Reduction Reaction Catalytic Activity