This paper presents background, experimental design, and preliminary experimental results for the liquid hydrogen bubble point tests conducted at the Cryogenic Components Cell 7 facility at the NASA Glenn Research Center in Cleveland, Ohio. The purpose of the test series was to investigate the parameters that affect liquid acquisition device (LAD) performance in a liquid hydrogen (LH2) propellant tank, to mitigate risk in the final design of the LAD for the Cryogenic Propellant Storage and Transfer Technology Demonstration Mission, and to provide insight into optimal LAD operation for future LH2 depots. Preliminary test results show an increase in performance and screen retention over the low reference LH2 bubble point value for a 325 2300 screen in three separate ways, thus improving fundamental LH2 LAD performance. By using a finer mesh screen, operating at a colder liquid temperature, and pressurizing with a noncondensible pressurant gas, a significant increase in margin is achieved in bubble point pressure for LH2 screen channel LADs.

关键词：液态氢；推进剂储存；推进剂箱

查看摘要 索取原文[24页]

Safe transport and long term storage of used nuclear fuel requires that the fuel clad material remains structurally sound. Understanding the impact of irradiation on new and high burn-up fuel cladding materials is critical to make this assessment. There is, therefore, a need to establish the relationship between the behavior and performance of unirradiated cladding and actual irradiated cladding. ORNL is addressing this linkage with an experiment designed to simulate high-burnup used fuel cladding by irradiating cladding material in the High Flux Isotope Reactor (HFIR). Fast neutron irradiation of pre-hydrided zirconium-alloy cladding in the HFIR at elevated temperatures is being carried out to simulate the effects of high burnup on used fuel cladding. Test results from irradiated, prehydrided metallic materials will be used to benchmark test results of high-burnup used fuel cladding. Additionally, samples free of alpha contamination can be provided to researchers/students in universities without hot cell facilities to support the Department of Energy Office of Nuclear Energy Used Fuel Disposition Campaign (UFDC). This approach is designed to provide well-controlled neutron irradiation of pre-hydrided materials in the desired temperature range (200-350 degrees C) similar to the service temperatures of boiling water reactors (BWRs) and pressurized water reactors (PWRs). The clad hydrogen content is in the range of 400-800 weight parts per million (wppm), which is similar to what has been observed for high-burnup used fuel cladding in PWRs.

关键词：燃耗；覆层；污染；快中子；HFIR反应器

查看摘要 索取原文[5页]

Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

关键词：锂电池；地面车辆；生命周期管理

查看摘要 索取原文[24页]

A pre-irradiation grafting method is a fascinating technique for direct introduction of new functional graft polymers (grafts) into polymer substrates without any damages. The radiation technique has been widely applied to the preparation of high performance fuel cell polymer electrolyte membranes (PEMs) for mobile electricities, vehicles, and domestic co-generation systems. The PEMs of aromatic hydrocarbon polymers, so-called "super engineering plastics" including poly (ether ether ketone) (PEEK), have useful characteristics such as high mechanical strength, gas barrier property, and radiation resistance. Thus, in this work, we investigated the humidity dependence of proton conductivity and mechanical strength at 80 ℃ and relative humidity (RH) from 30 to 95%, which are the most important characteristics for power generation efficiency and durability under real operating conditions in fuel cell systems.

关键词：燃料电池；电解质材料；聚合物

查看摘要 索取原文[1页]

Nanostructured materials have attracted great attention in recent time because of their innovative characteristics and potential applications in the fields of catalysis, drug delivery, sensors and pollution abatement measures. Stabilized metal nanoparticles (size ＜ 10 nm) with very active surface atoms, high selectivity and recyclability have lead to a new generation of 'Nanocatalysts' for sustainable green chemistry for industrial applications like fine and bulk chemicals, Pharmaceuticals, fuel cell, petroleum refineries, environmental catalysis and many other fields. The present chapter summarizes the techniques for preparations, characterizations, and catalytic activities of different metals nanoparticles for organic transformations.

关键词：新型电池；燃料电池；纳米材料

查看摘要 索取原文[23页]

PEVs can represent a significant power resource for the grid. An IVCI with bi-direction V2G capabilities would allow PEVs to provide grid support services and thus generate a source of revenue for PEV owners. The fleet of EV Project vehicles represents a power resource between 30 MW and 90 MW, depending on the power rating of the grid connection (5-15 kW). Aggregation of vehicle capacity would allow PEVs to participate in wholesale reserve capacity markets. One of the key insights from EV Project data is the fact that vehicles are connected to an EVSE much longer than is necessary to deliver a full charge. During these hours when the vehicles are not charging, they can be participating in wholesale power markets providing the high-value services of regulation and spinning reserves. The annual gross revenue potential for providing these services using the fleet of EV Project vehicles is several hundred thousands of dollars to several million dollars annually depending on the power rating of the grid interface, the number of hours providing grid services, and the market being served. On a per vehicle basis, providing grid services can generate several thousands of dollars over the life of the vehicle.

关键词：电池充电；电池；电动车辆

查看摘要 索取原文[40页]

As a first step towards a microscopic understanding of single-Pt atom-dispersed catalysts on non-conventional TiN supports, we present density- functional theory (DFT) calculations to investigate the adsorption properties of Pt atoms on the pristine TiN(100) surface, as well as the dominant influence of surface defects on the thermodynamic stability of platinized TiN. Optimized atomic geometries, energetics, and analysis of the electronic structure of the Pt/TiN system are reported for various surface coverages of Pt. We find that atomic Pt does not bind preferably to the clean TiN surface, but under typical PEM fuel cell operating conditions, i.e. strongly oxidizing conditions, TiN surface vacancies play a crucial role in anchoring the Pt atom for its catalytic function. Whilst considering the energetic stability of the Pt/TiN structures under varying N conditions, embedding Pt at the surface N-vacancy site is found to be the most favorable under N-lean conditions. Thus, the system of embedding Pt at the surface N-vacancy site on TiN(100) surface could be a promising catalyst for PEM fuel cells.

关键词：燃料电池；原子吸附；计算缺陷

查看摘要 索取原文[18页]

The ultimate goal of this project is to develop a viable C-coating process of the current collector in order to improve the overall power performance of the electrode of Li-ion batteries. During this third-year period, the performance of different thickness of carbon coating on Al foil is compared. The result shows that only the samples with sufficient thickness to form conductive channel on the surface would give a positive effect on the performance. Scale up of this coating process is further developed to make 1.5 m long C-coated tape by a contentious process followed with a special batch thermal process called roll-calcination. The same positive effects seen on small samples have been reproduced.

关键词：碳涂层电流收集器；化学汽相淀积；锂离子二次电池；蓄电池

查看摘要 索取原文[12页]

OH Laser Induced Fluorescence (LIF) and picosecond (ps), broadband Coherent Anti-Stokes Raman Spectroscopy (CARS) are used for time-resolved temperature and time-resolved, absolute OH number density measurements in lean H2-air, CH4-air, C2H4-air, and C3H8-air mixtures in a nanosecond (ns) pulse discharge cell/plasma flow reactor. The premixed fuel air flow in the reactor, initially at T0 = 500 K and P = 100 torr, is excited by a repetitive ns pulse discharge in a plane-to-plane geometry (peak voltage 28 kV, discharge gap 10 mm, estimated pulse energy 1.25 mJ/pulse), operated in burst mode at 10 kHz pulse repetition rate. In most measurements, burst duration is limited to 50 pulses, to preclude plasma-assisted ignition. The discharge uniformity in air and fuel air flows is verified using sub-ns-gated images (employing an intensified charge-coupled device camera). Temperatures measured at the end of the discharge burst are in the range of T = 550 600 K, using both OH LIF and CARS, and remain essentially unchanged for up to 10 ms after the burst. Time-resolved temperature measured by CARS during plasmaassisted ignition of H2-air is in good agreement with kinetic model predictions. Based on CARS measurement, vibrational nonequilibrium is not a significant factor at the present conditions. Time-resolved, absolute OH number density, measured after the discharge burst, demonstrates that OH concentration in C2H4-air, C3H8-air, and CH4 is highest in lean mixtures. In H2-air, OH concentration is nearly independent of the equivalence ratio. In C2H4-air and C3H8-air, unlike in CH4- air and in H2-air, transient OH-concentration overshoot after the discharge is detected. In C2H4-air and C3H8-air, OH decays after the discharge on the time scale of 0.02 0.1 ms, suggesting little accumulation during the burst of pulses repeated at 10 kHz. In CH4-air and H2-air, OH concentration decays within 0.1 1.0 ms and 0.5 1.0 ms, respectively, showing that it may accumulate during the burst.

关键词：荧光；动力学；激光；低温；混合物

查看摘要 索取原文[17页]

The electrodes in Unitized Reversible Fuel Cell system with supported platinum carbon black are reported.However, the electrodes in the system is consist two internal modes; it is electrolyzer and fuel cell mode.A Unitized Reversible Fuel Cell has dual function electrodes are joined in the same cell to reduce the volume and improvement efficiency performance.The electrodes of Unitized Reversible Fuel Cells operating on hydrogen and oxygen which have as high as efficiency at most the applications.Therefore, This article is concentrated on the preparation of bifunctional electrodes as design and material with low platinum loading and supported by platinum carbon black and characterization by using scanning electron microscopy.As well as, survey the latest literature on bifunctional electrodes and electrocatalysts to identify the major problems occur in design of the URFC electrodes.

关键词：可逆燃料电池；铂金；电极；电催化剂；催化剂层

查看摘要 索取原文[4页]