Advances in electrocatalysis for hydrogen evolution in the light of the Brewer-Engel valence-bond theory☆

The specification discloses a method for making a curved, conductively coated glass member, and the resulting product, by providing for a sufficient degree of substoichiometry at the moment of bend that the glass can be bent using conventional bending techniques without crazing the coating. Two alternative methods for achieving the degree of substoichiometry are disclosed. One involves coating the part to an initial light transmittance (To) which is lower than that typically sought by prior artisans. The other involves bending the part in a reducing environment. Also disclosed is a method for increasing conductivity of the coating by exposing the coated part to a reducing environment at temperatures considerably higher than those heretofore thought feasible for use in reduction curing.

Process for making a curved, conductively coated glass member and the product thereof

Hydrogen overpotential for transition metals and alloys, and its interpretation using an electronic model

Advances in electrocatalysis for hydrogen evolution in the light of the Brewer-Engel valence-bond theory

A metal hydride reactor including at least one sealed chamber, the chamber being divided into two compartments by a partitioning wall made of a material permeable to hydrogen gas but impermeable to metal hydrides, the compartments containing different metal hydrides. In one embodiment, the metal hydride reactor including a sealed vessel rotatable about a central shaft, the vessel being divided into a plurality of sealed chambers by at least one sealing wall along a plane containing the central shaft and extending diametrically thereof, each of the sealed chambers being divided into two compartments by a partitioning wall made of a material permeable to hydrogen gas but impermeable to metal hydrides, the compartments containing different metal hydrides, and each of the compartments having a heat conducting surface facing exteriorly thereof.

Metal hydride reactor

An alloy comprising Mischmetal, cobalt and nickel is effectively usable for occlusion of hydrogen.

Alloy for occlusion of hydrogen

A device for the storage of hydrogen, comprising a container, two porous plates opposed parallelly to each other across a fixed distance and fastened to the inner wall of the container, heating/cooling members disposed one each outside the porous plates and separated by a fixed distance from the corresponding porous plates, and an alloy capable of storing hydrogen placed in the spaces formed between the porous plates and the heating/cooling members

Device for storage of hydrogen

PURPOSE: To obtain an alloy capable of occluding much H in the form of hydride and of easily releasing H by heating, under reduced pressure or by other means by substituting specified metals for a prescribed amount of Ni of a misch metal-Ni alloy. CONSTITUTION: This MmNi alloy is represented by the formula (where Mm is misch metal, A is Al, Cu or Mn, B is Al, Co, Cu, Fe, Mn or Si, x is 0.1W2, y is 0.01W1.99, A≠B, and x>y). In case of x 2, the release of occluded H becomes difficult. In case of 0.01>y>1.99, the alloy shows characteristics close to those of an MmNi alloy contg. A or B alone, and high pressure is required for hydrogenation. This alloy has said advantages, and the occlusion and release of H are performed perfectly reversibly. COPYRIGHT: (C)1982,JPO&Japio

Misch metal-nickel alloy for occluding hydrogen

Hydrogen evolution reaction on a series of hydrogen absorbing Ni–V alloys, viz. Ni2V, NiV, and NiV3, before and after pretreatments with aq HF was studied in 1 M NaOH (1 M=1 mol dm−3) at 288–333 K by a galvanostatic overpotential transient technique. Results are related with the surface characteristics revealed by XPS techniques. It is concluded that the Ni in the Ni–V alloys is mainly responsible for their electrochemical properties and that the reaction proceeds via the Volmer-Tafel reaction route with mixed rate-determining characteristics: The activation heats are 7.7, 6.8, and kcal mol−1 (1 cal=4.184 J) for two elementary steps, Volmer and Tafel, and the overall reaction, respectively. The electrocatalytic activity of the Ni–V alloys, particularly NiV3, is drastically enhanced through the treatment with aq HF, and this is in parallel with the formation of porous Ni layers on their surface, namely the increase of the effective surface area. Potentiality of the alloys for water electrolysis cathode mat...

Electrodic properties and surface characteristics of Ni-V alloys for water electrolysis cathode materials.

PURPOSE:To manufacture the titled alloy having characteristics which bring on less change in the hydrogenation pressure to the composition of hydride in the plateau range by heat treating a misch metal-nickel quaternary alloy at a specified temp. CONSTITUTION:An alloy represented by the formula (where Mm is misch metal; A is Al, Co, Cr, Mn or Si; B is Al, Co, Cr, Cu, Fe, Mn or Si; A is always different from B; x is 0.1-2; y is 0.01-1.99; when A co, x is 0.1-4.9 and y is 0.01-4.89; and x>y) is heat treated at 500-1,000 deg.C for 0.25-6hr under reduced pressure or in an inert gaseous atmosphere, and the treated alloy is cooled. Thus, unstable lattice gaps produced in the manufacture of the alloy disappear, so a single-phase alloy is obtd. Since this alloy reacts with hydrogen at a higher reaction rate in a hydrogen occluding and releasing process, the time required to complete the reaction is shortened, and the occlusion of hydrogen is finished in a shorter time.

Masanori Nakane

Papers

Alloy for occlusion of hydrogen

Device for storage of hydrogen

Misch metal-nickel alloy for occluding hydrogen

Electrodic properties and surface characteristics of Ni-V alloys for water electrolysis cathode materials.

Manufacture of misch metal-nickel quaternary alloy for occluding hydrogen and manufacture