Electrochemical properties of rare-earth based hydrogen storage alloy for replacing Pt as the anode electrocatalyst in AFC

Chen, Yun; Wang, Xinhua; Chen, Lixin; Chen, Changpin; Wang, Qidong; Sequeira, C. A. C.

doi:10.1016/j.jallcom.2005.11.007

Cited by 8 publications

(2 citation statements)

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“…The fast and contemporary advances in electrocatalysis are stimulating the conversion of water, carbon dioxide, and nitrogen into the aforementioned products via electrochemical processes coupled to renewable energy. For instance, the currently tested water electrolysis system that works under alkaline conditions not requiring precious metals brings down the cost of water splitting technology, offering a viable way to store energy from solar and wind power in the form of hydrogen fuel, which can be used to produce clean electricity by fuel cells [76][77][78]; thus, this system is an excellent promise for affordable renewable energy. Hydrogen peroxide can also be derived from the oxygen reduction reaction (ORR) as well [79].…”

Section: Electrocatalysismentioning

confidence: 99%

Carbon Anode in Carbon History

Sequeira

2020

Molecules

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This study examines how the several major industries, associated with a carbon artifact production, essentially belong to one, closely knit family. The common parents are the geological fossils called petroleum and coal. The study also reviews the major developments in carbon nanotechnology and electrocatalysis over the last 30 years or so. In this context, the development of various carbon materials with size, dopants, shape, and structure designed to achieve high catalytic electroactivity is reported, and among them recent carbon electrodes with many important features are presented together with their relevant applications in chemical technology, neurochemical monitoring, electrode kinetics, direct carbon fuel cells, lithium ion batteries, electrochemical capacitors, and supercapattery.

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Section: Electrocatalysismentioning

confidence: 99%

Carbon Anode in Carbon History

Sequeira

2020

Molecules

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“…In order to increase the energy density, charge-dischargeability, cycle life, and other characteristics of the Ni-MH batteries, many studies have been carried out particularly to improve the performance of the MH electrodes. So far, the composition of the mischmetal-based, hydrogen storage alloy (HSA), and the effects of surface modification, composition and morphology are significant to meet such performances [3][4][5][6][7]. The present paper describes a systematic investigation of the effects of modifying a stoichiometric mischmetal alloy by an alkaline solution containing sodium borohydride on the hydrogen diffusion in the MmNi 3.6 Mn 0.4 Al 0.3 Co 0.7 hydride electrodes and the electrocatalytic activity at their surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Borohydride on the Hydrogen Diffusion in MmNi3.6Mn0.4Al0.3Co0.7 Hydride Electrode

Sequeira

Chen

Santos

2008

DDF

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Anodic polarisation curves of treated and untreated MmNi3.6Mn0.4Al0.3Co0.7 (Mm = mischmetal) electrodes were measured under the conditions of various initial concentrations of absorbed hydrogen (H/M), rates of potential sweep and temperatures. The alloy powders of the electrodes were treated with 6 M NaOH solution containing y M NaBH4 (y = 0.0, 0.005, 0.01, 0.02, 0.03 and 0.05). The initial concentration of absorbed hydrogen in the electrodes varied between 0 and 0.06 H/M, and the working temperature range was 15 °C to 50 °C. Anodic peak current (Ip) at the MmNi3.6Mn0.4Al0.3Co0.7 electrodes increased with an increase in the y value. In addition, the Ip value depended linearly on initial hydrogen concentration and square root of potential rate irrespective of y value. Furthermore, the activation energy for hydrogen diffusion decreased with an increase in y value. From these results, it is considered that the hydrogen diffusion in the MmNi3.6Mn0.4Al0.3Co0.7 alloys and the electrocatalytic activity at their surfaces influence the Ip value and that they are important factors for improving the charge-discharge performance of the negative hydride electrode. Its low temperature (15-30 °C) performances are also improved by the simple powder treatment with the 6 M NaOH solution containing NaBH4 as reducing agent.

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