摘要:
An electrocatalyst for fuel cell applications includes a catalyst support and a noble metal or noble metal-based alloy catalyst supported upon the catalyst support. The catalyst support characteristically includes a Group IV-VI transition metal silicide with or without the mixing of carbon. A fuel cell incorporating the electrocatalyst into the anode and/or cathode is disclosed. Such fuel cell exhibit improved cycling and operating performance.
摘要:
An apparatus is provided for carrying out a cavitation induced reaction comprising a reaction chamber for a liquid reaction medium, means for producing cavitation in the liquid reaction medium, at least one reactant inlet to the reaction chamber, an inert gas inlet conduit with a sparger for injecting a flowing stream of dry inert gas into the reaction chamber, a venting outlet for removal of a stream of the inert gas from the reaction chamber, and a recirculation conduit for re-circulating a stream of the inert gas from the venting outlet to the inert gas inlet conduit.
摘要:
A membrane electrode assembly for fuel cells includes a proton conducting membrane having a first side and a second side. The proton conducting membrane in turn includes a first polymer including cyclic polyether groups and a second polymer having sulfonic acid groups. The membrane electrode assembly further includes an anode disposed over the first side of the proton conducting layer and a cathode catalyst layer disposed over the second side of the proton conducting layer.
摘要:
In a lithium ion battery, one or more chelating agents may be attached to a microporous polymer separator for placement between a negative electrode and a positive electrode or to a polymer binder material used to construct the negative electrode, the positive electrode, or both. The chelating agents may comprise, for example, at least one of a crown ether, a podand, a lariat ether, a calixarene, a calixcrown, or mixtures thereof. The chelating agents can help improve the useful life of the lithium ion battery by complexing with unwanted metal cations that may become present in the battery's electrolyte solution while, at the same time, not significantly interfering with the movement of lithium ions between the negative and positive electrodes.
摘要:
The incorporation of tungsten-containing hydrogen spillover materials into a composite fuel cell anode can be helpful in preserving the carbon catalyst support materials in the fuel cell cathode during periods of hydrogen starvation. Preferred examples of such tungsten-containing hydrogen spillover materials are tungsten oxides and tungsten silicides. These materials, when physically mixed with catalyst-loaded carbon support particles in a composite anode, have shown the ability to promote hydrogen storage in amounts that, during a disruption of hydrogen gas flow, can postpone an anodic potential excursion into the oxygen evolution region for a period of at least several seconds.
摘要:
Methods of coating a nonconductive oxide ceramic on lithium-ion battery separators are provided. A separator is placed in a solution of a volatile organic solvent and an organometallic compound. The separator is coated with a ceramic formed from a metal oxide component of the organometallic compound when the volatile organic solvent evaporates.
摘要:
Method for monitoring conditions within a plurality of machines that receive fluid from a common source includes providing a supply line extending from the common source to an inlet at each of the machines. A return line is also provided that extends from an outlet at each of the machines to the common source to return fluid from each of the machines to the common source. A particulate filter is provided at the outlet of each of the machines so that each of the particulate filters will capture the particulates that were added to the fluid in the particular one of the machines with which that filter is associated. The particulate filters are periodically examined to determine the buildup of particulates that were generated within that particular machine. The particulate build up indicates whether or not a machine is in need of repair.
摘要:
In one exemplary embodiment, the state of engine oil degradation is monitored and determined using the size of viscosity hysteresis during heating-cooling cycles. In another exemplary embodiment, the state of engine oil degradation is monitored and determined using the sign of viscosity hysteresis during heating-cooling cycles. In yet another exemplary embodiment, the state of engine oil degradation is monitored and determined using relative viscosity changes hysteresis during heating-cooling cycles.
摘要:
A high surface area support material is formed of an intimate mixture of carbon clusters and titanium oxide clusters. A catalytic metal, such as platinum, is deposited on the support particles and the catalyzed material used as an electrocatalyst in an electrochemical cell such as a PEM fuel cell. The composite material is prepared by thermal decomposition and oxidation of an intimate mixture of a precursor carbon polymer, a titanium alkoxide and a surfactant that serves as a molecular template for the mixed precursors.