Electrochemical behavior of metal hydrides

Kleperis, Jānis; Wójcik, Grażyna; Czerwiński, Andrzej; Skowroński, J. M.; Kopczyk, M.; Bełtowska-Brzezinska, Maria

doi:10.1007/s100080000149

Cited by 276 publications

(148 citation statements)

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“…This wastes around 30% of the available energy from burning the hydrogen which makes this storage method a costly process [5]. ii) Compression of hydrogen gas in high-pressure tanks raises safety concern issues mainly as results of hydrogen embrittlement effects.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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Activated carbon has been synthesized from local palm shell, cardboard and plastics municipal waste in the Kingdom of Saudi Arabia. It exhibits a surface area of 930 m 2 /g and total pore volume of 0.42 cm 3 /g. This pristine activated carbon has been further anchored with nickel, palladium and platinum metal particles by ultrasound-assisted impregnation. Deposition of nanosized Pt particles as small as 3 nm has been achieved, while for Ni and Pd their size reaches 100 nm. The solid-gas hydrogenation properties of the pristine and metal-anchored activated carbon have been determined. The pristine material exhibits a reversible hydrogen storage capacity of 2.3 wt% at 77 K and 3 MPa which is higher than for the doped ones. In these materials, the spillover effect due to metal doping is of minor importance in enhancing the hydrogen uptake compared with the counter-effect of the additional mass of the metal particles and pore blocking on the carbon surface. OPEN ACCESS

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Section: Introductionmentioning

confidence: 99%

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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“…It meant that the amounts of silver element would be spread to cover the PE membrane surfaces, illustrating that more membrane surfaces could be adhered more widely and not to accumulate the drops and lines on the non-invasion surfaces of PE membrane surfaces. The coated silver with those processes could be well proportioned without destroying the initial attachments of silver element [22,23]. That was the reasons that the fastness properties of electroless of silver plating by the processes of the brush were out of the consideration.…”

Section: Amentioning

confidence: 99%

Comparisons of Fastness of the Coating Processes of Electroless Silver Plating on Polyethylene Membrane Surfaces

Yu¹,

Zhang²,

Geng³

et al. 2016

Proceedings of the 2015 International Conference on Materials Chemistry and Environmental Protection (Meep-15)

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(Table II) were not much different. The highest and lowest average fastness values of coating silver by different processes were the spray processes and the brush processes, respectively. Thus, the optimized coating processes of the electroless silver plating were the spray processes by adding the Tollen reagent and then the Dglucose to promote the adhesive values between the surfaces and silver element for the human beings health and the environment safety.

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“…One of the most spectacular applications of the LaNi 5 -based alloys is in rechargeable metal hydride batteries (NiMH type)-as negative electrodes of these batteries. The negative composite electrodes are usually made of LaNi 5 -based fine-grained powders, mixed with binder, conducting powders and mechanically pressed [1][2][3][4][5][6][7]. The hydrogen absorption of such porous electrodes manufactured of fine-grained powder particles easily accessible for alkaline electrolyte consists of cathodic charging (charge transfer takes place at the surface of individual particles) and diffusion of hydrogen atoms from the particle surface into the depth of the particle.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from the diffusion of H atoms in the crystal lattice, one should mention "easy paths" of diffusion on grain boundaries, between neighboring particles, inside material cracks or crevices and its slowdown by corrosion products (oxide/hydroxide phases, etc.). The resulting hydrogen transport in powdered, composite material (hydrogen diffusivity) can be characterized by the effective diffusion coefficient (D H ), which takes on values of the order of 10 [5,8,9]. The effective hydrogen diffusivity increases with the increase of easy paths of diffusion and decreases with particle oxidation, so it changes with electrode cycling [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen diffusivity in the massive LaNi5 electrode using voltammetry technique

Dymek

Bala

2013

J Solid State Electrochem

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The Randles-Sevčik relationship has been applied to evaluate atomic hydrogen diffusivity in massive LaNi 5 intermetallic compound. The electrode was cathodically hydrogenated in 6 M KOH solution (22°C), and then voltammetry measurements were carried out at various, very slow potential scan rates (υ =0.01-0.1 mV·s −1). At potentials more noble than the equilibrium potential of the H 2 O/H 2 system, the anodic peaks were registered as a consequence of oxidation of hydrogen absorbed in cathodic range. The peak potentials linearly increase with the logarithm of the scan rate with a slope of 0.059 V. The slope testifies to a symmetric charge transfer process with symmetry factor α =½. The peak currents linearly increase with the square root of the potential scan rate, and the straight line runs through the origin of the coordinate system. The slope of the I a (peak) =f(υ 1/2 ) straight line is a measure of the atomic hydrogen diffusion coefficient. Assuming the hydrogen concentration in the LaNi 5 material after cathodic exposure to be C 0,H =0.071 mol·cm −3 (63 % of theoretical value), the hydrogen diffusion coefficient equals D H =2.0· 10 −9 cm 2 s −1. Extrapolation of rectilinear segments of potentiodynamic polarization curves with Tafel slopes of 0.12 V and linear polarization dependencies from voltammetry tests allowed the exchange current densities of the H 2 O/H 2 system on the tested material to be determined. The exchange current densities on initially hydrogenated LaNi 5 alloy are close to 1 mA·cm −2

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Electrochemical behavior of metal hydrides

Cited by 276 publications

References 0 publications

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Comparisons of Fastness of the Coating Processes of Electroless Silver Plating on Polyethylene Membrane Surfaces

Hydrogen diffusivity in the massive LaNi5 electrode using voltammetry technique

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