WetEV wrote:SageBrush wrote:WetEV wrote:I'd be interested in your solution to the last 10% problem.
Ask me when we are at 80%
Sounds like maybe you should think about hydrogen as season shifting storage.
https://www.greencarcongress.com/2019/03/20190320-unsw.htmlUNSW, H2Store to develop hydrogen storage for renewables; residential and commercial P2G
Researchers at UNSW Sydney (Australia), with partner H2Store, an Australian start-up, have received a $3.5-million investment from Providence Asset Group to develop a hydrogen hydride storage system that could mean cheaper, safer storage for renewable energy for a range of applications, including residential.
Professor Kondo-Francois Aguey-Zinsou and his team at UNSW’s School of Chemical Engineering have developed a system that provides cheap storage and transportation of hydrogen which they expect will provide a new alternative for energy storage within two years.
Professor Aguey-Zinsou’s research group’s expertise is in the synthesis, characterization and application of nanosized hydride materials—i.e. materials such as magnesium hydride (MgH2) and lithium borohydride (LiBH4) capable of storing hydrogen. Their research focuses on the fundamental understanding of the behavior of hydride materials at the nanoscale (i.e. with a particle size below 10 nm).
The funding will help them deliver phase one of a four-stage project that includes the creation of prototypes of their hydrogen energy storage solution for residential and commercial use; demonstration units; and testing and optimization that will enable full commercialization of the product.
Professor Aguey-Zinsou believes that his invention would offer significant advantages over current power storage solutions for home solar systems, such as the Tesla Powerwall battery.
We will be able to take energy generated through solar panels and store it as hydrogen in a very dense form, so one major advantage of our hydrogen batteries is that they take up less space and are safer than the lithium-ion batteries used in many homes today. We can actually store about seven times more energy than the current systems.
This means that in a residential scenario, people will be able to store a lot more energy using the same footprint as Tesla batteries, to potentially power their home, charge their cars and still have excess to sell back to the grid.
Professor Aguey-Zinsou is one of the co-founders of H2Store.
UNSW and H2Store expect their solution to offer other advantages over current energy storage systems, including [b]a lifespan of about 30 years compared with less than 10 for other systems[/b].
As the hydrogen technology develops, we will see a new cost-effective alternative to chemical batteries, remote electricity generation, household heating and increased range of hydrogen vehicles. Over the next two years we will develop a range of storage options for individuals, households and energy providers, including a solar farm ‘battery’ system to provide grid stability across Australia.
—Llewellyn Owens, H2Store CEO and Co-founder
The team hopes to have a 5 kW home storage system prototype ready by the end of 2019 and a product on the market late in 2020.
The researchers are also working on a large-scale storage system for solar and wind farms that will include the design of storage vessels suitable for hydrogen export. These vessels have potential to replace diesel in remote generation and large transport applications.
Dedicated to the “green city life” concept, the Providence Asset Group invest in and develop clean and cost-effective renewable technologies.
https://www.greencarcongress.com/2019/03/20190319-dai.htmlStanford researchers develop new electrolysis system to split seawater into hydrogen and oxygen
. . . Existing water-splitting methods rely on highly purified water—a precious resource and costly to produce.
Electrolysis of water to generate hydrogen fuel is an attractive renewable energy storage technology. However, grid-scale freshwater electrolysis would put a heavy strain on vital water resources. Developing cheap electrocatalysts and electrodes that can sustain seawater splitting without chloride corrosion could address the water scarcity issue. . . .
—Kuang et al.
Theoretically, to power cities and cars, you need so much hydrogen it is not conceivable to use purified water, said Hongjie Dai, J.G. Jackson and C.J. Wood professor in chemistry in Stanford’s School of Humanities and Sciences and co-senior author on the paper.
Dai said his lab showed proof-of-concept with a demo, but the researchers will leave it up to manufacturers to scale and mass produce the design. . . .
The researchers discovered that if they coated the anode with layers that were rich in negative charges, the layers repelled chloride and slowed down the decay of the underlying metal.
They layered nickel-iron hydroxide on top of nickel sulfide, which covers a nickel foam core. The nickel foam acts as a conductor—transporting electricity from the power source—and the nickel-iron hydroxide sparks the electrolysis, separating water into oxygen and hydrogen. . . .
]Without the negatively charged coating, the anode only works for around 12 hours in seawater, according to Michael Kenney, a graduate student in the Dai lab and co-lead author on the paper.
The whole electrode falls apart into a crumble. But with this layer, it is able to go more than a thousand hours.
Previous studies attempting to split seawater for hydrogen fuel had run low amounts of electric current, because corrosion occurs at higher currents. But Dai, Kenney and their colleagues were able to conduct up to 10 times more electricity through their multi-layer device, which helps it generate hydrogen from seawater at a faster rate.
I think we set a record on the current to split seawater.
The team members conducted most of their tests in controlled laboratory conditions, where they could regulate the amount of electricity entering the system. But they also designed a solar-powered demonstration machine that produced hydrogen and oxygen gas from seawater collected from San Francisco Bay. . . .
The technology could be used for purposes beyond generating energy. Since the process also produces breathable oxygen, divers or submarines could bring devices into the ocean and generate oxygen down below without having to surface for air.
One could just use these elements in existing electrolyzer systems and that could be pretty quick. It’s not like starting from zero—it’s more like starting from 80 or 90 percent.
—Hongjie Dai. . . .
This work was funded by the US Department of Energy, National Science Foundation, National Science Foundation of China and the National Key Research and Development Project of China.
https://www.pnas.org/content/early/2019/03/12/1900556116Solar-driven, highly sustained splitting of seawater into hydrogen and oxygen fuels
Thanks for the link. Having low resistance does not mean the cell has high energy efficiency. The reason is that unless there is NO chemical reaction at the anode (as is the case with Li-ion batteries), then there can be a step difference in voltage between the charge and discharge reactions. For instance, plating Lithium onto the anode during charging happens at a higher voltage than stripping that Li off the anode during discharge. The ratio of the stripping voltage divided by the plating voltage is the maximum efficiency which can be achieved in such a battery.WetEV wrote:RegGuheert wrote:But here is the rub: Many of the near-term improvements in batteries will be achieved by moving to a solid electrolyte. That change will increase energy density and safety and reduce cost. Unfortunately, it will also reduce the efficiency.
Instead of the 98+% round-trip energy efficiency which is achieved in the battery in your Tesla Model 3, battery efficiency could drop to somewhere between 60% and 90%.
I don't think so. Example of solid state batteries with low losses:
Sure. Here it is: Braga, et. al.: Non-Traditional, Safe, High-Voltage Rechargeable Cells of Long Cycle Life:WetEV wrote:Source for your assertion?
This battery plates and strips Li metal from the anode. It is the one which famously gains capacity as it is cycled, assumedly due to the creation and enhancement of a high-value capacitor within the cell.Braga, et. al. on page wrote:The energy efficiency was 86% for cycle 329, while for the first cycle it was 30%.
GRA wrote:I had to look at this twice to make sure I didn't write it (I have, or words to the same effect, said the same things many times in the past). It seems that Reg and I are in near 100% agreement. I write this while lying on the floor, where I have fallen after being hit by a feather (but I can get up)!
https://www.greencarcongress.com/2019/03/20190328-man.htmlMAN Energy Solutions acquires 40% of electrolysis company H-TEC Systems; strategic investment in hydrogen
. . . The contract also makes provisions for a majority or complete takeover of H-TEC Systems at a later date. . . .
H-TEC Systems has more than 20 years’ experience in the research and development of hydrogen technology. Across sites in Lübeck, Braak and Augsburg, a team of 20 employees develops and produces stacks and electrolyzers for manufacturing hydrogen with electricity. . . .
This acquisition marks another step in the strategic direction MAN Energy Solutions had already decided upon back in 2017—the realignment of the business to focus on sustainable future markets. At that time, the company announced that its business activities concerning sustainable technologies and solutions would be expanded to become the main source of revenue by 2030.
Strategic acquisitions and partnerships would also play an integral role in expanding the company’s own range of products and touching on the global trends of decarbonization and digitalization. In 2017, MAN Energy Solutions acquired a 40 percent stake in Aspin Kemp Associates, a Canadian company specializing in battery technology. Two years prior to this, it had additionally acquired the maritime division of Cryo AB, a Swedish company manufacturing cryogenic equipment for the storage, distribution and handling of liquid natural gas.
Last year, in collaboration with ABB, MAN also introduced the trigeneration storage solution ETES (Electro-Thermal Energy Storage system) to the market. ETES stores electricity and thermal energy (for both heating and cooling) in significant quantities and distributes these to consumers.
https://www.greencarcongress.com/2019/03/20190331-arcelor.htmlArcelorMittal investigates hydrogen-based direct reduction of iron ore for steel production; CDA
To permanently reduce CO2 emissions, steelmaker ArcelorMittal has developed a low-emissions technology strategy, which targets not only the use of alternative feedstocks and the conversion of CO2 emissions, but also the direct avoidance of carbon (Carbon Direct Avoidance, CDA).
This year, the Group intends to launch a new project in the ArcelorMittal plant in Hamburg to use hydrogen on an industrial scale for the direct reduction of iron ore (H-DR) in the steel production process for the first time. (DRI is iron ore that has been reduced to iron with without melting.) A pilot plant is to be built in the coming years.
The Hamburg plant already has one of the most efficient production processes of the ArcelorMittal Group due to the use of natural gas in a direct reduction plant (DRI, direct reduced iron). The aim of the new hydrogen-based process is to be able to produce steel with the lowest CO2 emissions.
The project costs amount to around €65 million (US$73 million). In addition, a cooperation agreement with the University of Freiberg is planned to test the procedure in the coming years at the Hamburg plant premises. The hydrogen-based reduction of iron ore will initially take place on a demonstration scale with an annual production of 100,000 tonnes.
Our Hamburg site offers optimum conditions for this innovative project: an electric arc furnace with DRI system and iron ore pellets stockyard as well as decades of know-how in this area. The use of hydrogen as a reducing agent shall now be tested in a new shaft furnace.
—Frank Schulz, CEO of ArcelorMittal Germany
In the process, the separation of H2 with a purity of more than 95% from the top gas of the existing plant should be achieved by pressure swing adsorption. The process is first tested with grey hydrogen (generated at gas separation) to allow for economical operation. In the future, the plant should also be able to run on green hydrogen (generated from renewable sources) when it is available in sufficient quantities. . . .
Likewise, methods are tested in which biocoal from waste wood is used instead of coking coal as a reducing agent in the blast furnace. . . .
https://www.greencarcongress.com/2019/03/20190329-fcv.htmlDOE: more than 6,500 fuel cell vehicles are on the road in the US