oxygen reduction kinetics on graphite cathodes in

Improvement of the oxygen reduction cathodes of microbial fuel

Improvement of the oxygen reduction cathodes of microbial fuel cells designed to treat municipal wastewater A dissertation presented by Richard John Burkitt to the department of Chemical Engineering and Advanced Materials In partial fulfilment of the Doctor of

Research Online

This study aims to investigate the potential of porous Co3O4 nanorods as the cathode catalyst for oxygen reduction reaction (ORR) in aqueous air cathode microbial fuel cells (MFCs). The porous Co3O4 nanorods were synthesized by a facile and cost-effective hydrothermal method. Three different concentrations (0.5 mg/cm2, 1 mg/cm2, and 2 mg/cm2) of Co3O4 nanorods coated on graphite

Oxygen Reduction Reaction Electrocatalysts Derived from

2018/10/22The kinetics performance in oxygen reduction reaction of the catalysts was studied first in rotating ring disk electrode (RRDE) in neutral media. Electrochemical parameters of interest, such as onset potential, half wave potential, limiting current, hydrogen peroxide generation, and electron transfer mechanism, were investigated.

Supporting Information Methanol Fuel Cells Catalysts for Oxygen Reduction and Cathodes

Supporting Information Size-dependence on Electrochemical Performance of Fe-N-C Catalysts for Oxygen Reduction and Cathodes of Direct Methanol Fuel Cells Xinlong Xu, [a, b] Zhangxun Xia, [a] Xiaoming Zhang, [a] Huanqiao Li, [a] Suli Wang, *[a] Gongquan Sun*[a]

N

The availability of low-cost, efficient, and durable catalysts for oxygen reduction reaction (ORR) is a prerequisite for commercialization of the fuel cell technology. Along with intensive research efforts of more than half a century in developing nonprecious metal catalysts (NPMCs) to replace the expensive and scarce platinum-based catalysts, a new class of carbon-based, low-cost, metal-free

Oxygen Reduction Catalysts for Fuel Cells

In contrast, the oxygen reduction reaction that occurs at the cathode usually has an overpotential of 500-600 mV with a platinum-based catalyst. This large overpotential at the cathode results in a substantial loss in efficiency, and thus the development of superior oxygen reduction catalysts must be addressed before even considering issues of hydrogen storage and production.

Article Thin film cathodes in SOFC research: How to identify oxygen reduction pathways?

electrode with oxygen being reduced at the electrode surface. (d) Bulk path II: similar to (c) but with the reduction step at the electrode–electrolyte 2PB. A.K. Opitz et al.: Thin film cathodes in SOFC research 2086 J. Mater. Res., Vol. 28, No. 16, Aug 28, 2013

(Invited) Role of Chemical Heterogeneities on Oxygen

We investigated the effects of annealing and A-site stoichiometry on the surface heterostructures at (La0.8Sr0.2)yMnO3 (LSM, y≤1) dense thin films. Lee, W., Z. Cai, and B. Yildiz. "(Invited) Role of Chemical Heterogeneities on Oxygen Reduction Kinetics on the

Electrochemical Kinetics of Corrosion and Passivity

1 Electrochemical Kinetics of Corrosion and Passivity The basis of a rate expression for an electrochemical process is Faraday's law: nF Ita m = Where m is the mass reacted, I is the measured current in ampere, t is the time, a is the atomic weight, n the

Elementary kinetics of the oxygen reduction reaction on

2017/2/1However, one of the major stumbling blocks toward commercialization is the optimal design of cathodes and selection of materials that readily catalyze the oxygen reduction reaction (ORR) . In fact, cathodic polarization due to slow ORR kinetics is widely acknowledged to be the dominant source of losses especially in the low-intermediate temperature range [2], [3] .

Identification of catalytic sites for oxygen reduction and

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical to renewable energy conversion and storage technologies. Heteroatom-doped carbon nanomaterials have been reported to be efficient metal-free electrocatalysts for ORR

Non

2007/12/1In previous research, the problem of the overpotential of oxygen reduction at microbial fuel cell cathodes has been addressed through specific selection of catalysts and electrode materials. Only few data were generated for non-catalyzed cathodes, as they were thought not to have the ability to sustain the current demanded by microbial fuel cell anodes.

Electrochemical Kinetics of Corrosion and Passivity

1 Electrochemical Kinetics of Corrosion and Passivity The basis of a rate expression for an electrochemical process is Faraday's law: nF Ita m = Where m is the mass reacted, I is the measured current in ampere, t is the time, a is the atomic weight, n the

Recent Advances in Single

Oxygen reduction reaction (ORR) plays significant roles in electrochemical energy storage and conversion systems as well as clean synthesis of fine chemicals. However, the ORR process shows sluggish kinetics and requires platinum-group noble metal catalysts to accelerate the reaction. The high cost, rare reservation, and unsatisfied durability significantly impede large-scale commercialization

Fundamental interplay between anionic/cationic redox

COMMUNICATIONS ARTICLE DOI: 10.1038/s41467-017-02291-9 Fundamental interplay between anionic/cationic redox governing the kinetics and thermodynamics of lithium-rich cathodes Gaurav Assat 1,2,3 Dominique Foix2,4, Charles Delacourt2,5, Antonella

Impact of Sr segregation on the electronic structure and

The correlation between the surface chemistry and electronic structure is studied for SrTi1−xFexO3 (STF), as a model perovskite system, to explain the impact of Sr segregation on the oxygen reduction activity of cathodes in solid oxide fuel cells. Dense thin films of

OxygenReductionReactioninaDropletonGraphite:DirectEvidence

KOH solution, clear oxygen reduction peaks were observed forallofthegraphiteelectrodes,butnotwiththeN 2-saturated solution. For the ORR, the CV curve of pristine graphite showed a reduction peak potential of 0.51 V. Upon ball-milling, the reduction peak

An Investigation of Oxygen Reduction Kinetics in LSF

The characteristics of solid oxide fuel cell (SOFC) cathodes, prepared by infiltration of La0.8Sr0.2FeO3−δ (LSF) into porous yttria-stabilized zirconia (YSZ) scaffolds, were evaluated by studying the effect of p(O2) and of Al2O3overlayers deposited by Atomic Layer Deposition (ALD) on impedance spectra at 873 and 973 K. The electrode resistance of LSF-YSZ composites calcined at

Ethanol: Tolerant Oxygen Reduction Reaction Catalysts

This paper describes electrocatalysts for the oxygen reduction reaction (ORR) in alkaline direct ethanol fuel cells (ADEFCs), using the non-noble metal electrocatalyst Ag/C, MnO 2 /C and AgMnO 2 /C. These electrocatalysts showed tolerance toward ethanol in alkaline media and therefore resistance to ethanol crossover in ADEFCs.

Understanding the reaction of nuclear graphite with

2021/5/1This article reviews the reaction of graphite with molecular oxygen in terms of the reaction kinetics, gas transport, and structural evolution of graphite. It also presents the foundations of a universally applicable oxidation model, independent of graphite grade, which is capable of describing both the bulk and local oxidation rates under a wide range of conditions applicable to air-ingress.

Recent Advances in Single

Oxygen reduction reaction (ORR) plays significant roles in electrochemical energy storage and conversion systems as well as clean synthesis of fine chemicals. However, the ORR process shows sluggish kinetics and requires platinum-group noble metal catalysts to accelerate the reaction. The high cost, rare reservation, and unsatisfied durability significantly impede large-scale commercialization

Supporting Information Methanol Fuel Cells Catalysts for Oxygen Reduction and Cathodes

Supporting Information Size-dependence on Electrochemical Performance of Fe-N-C Catalysts for Oxygen Reduction and Cathodes of Direct Methanol Fuel Cells Xinlong Xu, [a, b] Zhangxun Xia, [a] Xiaoming Zhang, [a] Huanqiao Li, [a] Suli Wang, *[a] Gongquan Sun*[a]

Effect of the Ionic Conductivity of the Electrolyte in Composite SOFC Cathodes

electrons for the oxygen reduction reaction) and ionic conductivity (to transport the oxygen ions from the cathode into the electrolyte)1–3 The material most commonly used in SOFC cathodes is LSM (La 1 xSr xMnO 3), which satisfies the conditions of catalytic

Preparation for Graphite Materials and Study on

2.3. Preparation of Graphite Cathode for the Three Electrodes System 0.2 g graphite sample and 0.3 g solid paraffin were mixed uniformly in the condition of heat (60˚C), then the mixture was put into the glass tube (diameter is 5 mm), the packing height was 4 cm, and copper wire prepared was inserted in the middle of the glass tube.

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