摘要:
A gas diffusion layer that is usable with a fuel cell includes a material that is adapted to permit a reactant of the fuel cell to diffuse through the material. The material includes flow channels for communicating the reactant so that at least a portion of the reactant diffuses through the material to a membrane of a fuel cell. The gas diffusion layer may be received by a recessed portion of a plate.
摘要:
A hydrogen recycling system for a controlled atmosphere unit operation with an exhaust vent and an inlet port includes: a hydrogen recycle unit in fluid communication with the exhaust vent and in fluid communication with the inlet port; and an oxygen reactor being located between the controlled atmosphere unit operation and said hydrogen recycle unit and in fluid communication with the controlled atmosphere unit operation and said hydrogen recycle unit.
摘要:
The invention is a process for the preparation of coated nitride powder, comprising contacting one or more metal complex(es), organo-aluminum material, optionally one or more silicon compounds or mixtures thereof, with nitride powder under conditions such that coated nitride powder is formed. A metal complex is a metal-containing system which is soluble in a host liquid. The process of the invention is a process for making coated nitride powder and obtaining the desirable properties of coated nitride powder, while maintaining the desirable properties of the uncoated powder, such as good thermal conductivity, for use in electronic applications. In another aspect, the invention is a coated nitride powder which has the advantageous properties of the uncoated powder and is a desirable alternative to current nitride coatings.
摘要:
Carbothermally reduce a metal oxide to its corresponding metal nitride or metal carbide powder in a vertical gravity flow reactor by adding precursor pellets containing the metal oxide, a thermally decomposed binder material and carbon or a source of carbon directly to a heated reaction zone within the reactor. The pellets form a pellet bed, the top of which must be maintained within the heated reaction zone. The binder material is a blend of wheat and corn starches, optionally in conjunction with another binder such as melamine. The binder material thermally decomposes to a carbonaceous residue which functions both as an additional source of carbon and as a binder for the precursor pellets. The reactor may be modified by adding an internal vent line to remove volatile materials from the heated reaction zone before they have an opportunity to condense on internal reactor surfaces.
摘要:
In an electrolysis cell, a separator having a buried wire screen is disclosed. The screen is connected to a bias voltage source to repel unwanted ionic migration across the screen and hence the separator.
摘要:
A combination fuel cell and hydrogen or oxygen pump includes an electrochemical cell comprising an anode inlet for receiving fuel, an anode outlet for exhausting fuel, a cathode inlet for receiving oxidant, a cathode outlet for exhausting oxidant, and first and second electrical connectors. A controller is operable for applying an electrical load to the electrochemical cell for generating electricity, and for applying an electrical potential to the electrochemical cell for purifying hydrogen or purifying oxygen. Methods and infrastructure systems are also disclosed.
摘要:
A combination fuel cell and hydrogen or oxygen pump includes an electrochemical cell comprising an anode inlet for receiving fuel, an anode outlet for exhausting fuel, a cathode inlet for receiving oxidant, a cathode outlet for exhausting oxidant, and first and second electrical connectors. A controller is operable for applying an electrical load to the electrochemical cell for generating electricity, and for applying an electrical potential to the electrochemical cell for purifying hydrogen or purifying oxygen. Methods and infrastructure systems are also disclosed.
摘要:
Silicon carbide/silicon nitride composites are prepared by carbothermal reduction of crystalline silica powder, carbon powder and optionally crsytalline silicon nitride powder. The crystalline silicon carbide portion of the composite has a mean number diameter less than about 700 nanometers and contains nitrogen.
摘要:
An ion exchange membrane or ion exchange membrane/electrode assembly having increased efficiency in proton exchange processes as the result of membrane hydration processing comprising heating a hermetically sealed membrane or membrane/electrode assembly at elevated temperature and pressure so as to provide increased hydration levels of the membrane.
摘要:
Apparatus and operating methods are provided for controlled atmosphere furnace systems. In one possible embodiment, hydrogen is injected from a hydrogen source to an enclosure. The hydrogen is circulated within the enclosure from a gas inlet to a gas outlet. A temperature is raised within the enclosure to a predetermined threshold. Hydrogen is pumped from the gas outlet to the gas inlet with an electrochemical hydrogen pump. The electrochemical hydrogen pump has a first electrode in fluid communication with the gas outlet, and a second electrode in fluid communication with the gas inlet. An electrical potential is provided between the first and second electrodes, wherein the first electrode has a higher electrical potential with respect to zero than the second electrode. Various methods, features and system configurations are discussed.