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Article courtesy of NREL.
by Wayne Hicks

On a clear night, Kaitlyn VanSant will be able to watch her work whiz by. Knowing the success of her project, however, will have to wait until her tiny, temporary addition to the International Space Station returns to Earth.

“My family and I have definitely been looking up at night more frequently,” said VanSant, who earned her doctorate from the Colorado School of Mines in materials science last year. Now a postdoctoral researcher with NASA, VanSant holds a unique collaborative appointment at the National Renewable Energy Laboratory (NREL).

The pairing of NREL and NASA continues a long-standing alliance between solar power and space. Specialized photovoltaic (PV) panels turned to the sun have been used to generate electricity for Mars rovers and space probes, but the manufacturing costs of these high-efficiency solar cells are too high for use on Earth. Researchers at NREL are testing ways to bring those costs down for terrestrial applications and transforming how PV technologies could work in space as well.

The latest test will evaluate the potential use of perovskite solar cells in space and assess the durability of materials used in those cells. VanSant worked with Ahmad Kirmani, Joey Luther, Severin Habisreutinger, Rosie Bramante, Dave Ostrowski, Brian Wieliczka, and Bill Nemeth at NREL to prepare the perovskite cells and materials. Eight of these samples are scheduled to launch to the space station in August and another set of 25 samples will be launched in the spring of 2022. The samples, each of which are a square inch in size, are part of the Materials International Space Station Experiment (MISSE) program and will be fastened to the outside of the orbiting platform.

The International Space Station (ISS) serves as an orbiting research laboratory and observatory that conducts scientific experiments in a range of fields that include astronomy, physics and materials science, to name just a few.

“We get to prove very nascent technologies in such a way that we don’t fool ourselves by simulating the space environment on the ground in a vacuum chamber, for example,” said Timothy Peshek, an electrical engineer in the photovoltaics group at NASA Glenn Research Center in Cleveland and VanSant’s postdoctoral adviser. “This is the real-world operation.”

With approval in hand to return PV experiments to the space station, Peshek put out calls for researchers who might want to take part. Adele Tamboli, a researcher in the Materials Physics research group at NREL, welcomed the opportunity, and introduced Peshek to VanSant.

“Partnering with the National Renewable Energy Laboratory just made a lot of sense,” said Peshek, himself a former post-doctoral researcher at NREL. “They had the facilities and abilities ready to go on day one.”

This perovskite sample is in the intermediate crystal phase and about to be placed on a hotplate to fully crystallize. Photo by Dennis Schroeder, NREL

Solar power on Earth tends to be generated from silicon modules. Other PV technologies, such as those used in space, rely on materials from the III and V columns of the periodic table and are dubbed III-V cells. Scientists have experimented with stacking a III-V cell atop a layer of silicon to increase the efficiency of capturing sunlight to convert to electricity. By itself, the most efficient silicon solar cell is about 26%, when measured under the typical terrestrial solar spectrum. (The solar spectrum is different on Earth and in space.)

Tamboli was among the research group that set records in 2017 for III-V cells on silicon, including a triple-junction cell with an efficiency of 35.9%. She, along with VanSant and staff scientist Emily Warren, would later propose that these types of cells could find a use to power satellites in a low Earth orbit. Before that could happen, the cells had to be tested in the extreme conditions of space.

If the moon is a harsh mistress, space itself can be equally cruel. Equipment is subjected to extreme swings in temperatures and bombarded by solar radiation. When the ISS moves behind the Earth and away from the sun, the temperature plummets to 250 degrees below zero Fahrenheit. Emerging into sunlight spikes the temperature to 250 degrees above zero.

“That’s harsh,” Peshek said. “That’s a pretty brutal environment.”

“Radiation damage is a factor,” said Warren. “Our record cell was gallium arsenide on silicon, and the one that we sent up is actually gallium indium phosphide on silicon. That was because we know that those materials would be more radiation tolerant.”

SpaceX’s cargo re-supply spacecraft carried NREL’s III-V-on-silicon solar cell to the ISS in March 2020. VanSant, whose Ph.D. research centered on III-V-on-silicon tandem solar cells, worked with Michelle Young and John Geisz at NREL to fabricate the prototype cell for the MISSE project, and watched a broadcast of the rocket launch carrying it into space.

“I watched it with my two daughters,” VanSant said. “They got a real kick out of it. I mean, you can’t really watch a space launch without just being completely fascinated. Nobody can be blasé about a space launch.”

The prototype spent 10 months affixed to the exterior of the ISS before being returned to Earth in January.

“The post-flight analysis of the cell gives us the opportunity to study how we want to evolve the design and to improve it for performance and to see whether it’s realistic that this could be a technology for providing power in space,” VanSant said.

Now she is playing a waiting game for the perovskite solar cells and materials, which are expected to spend six months on the ISS. The process is not a straight shot into space. After NREL, the cells are shipped to Alphaspace, a Houston company that prepares the samples for operation on the MISSE platform and arranges the launch of the experiment aboard a SpaceX flight.

Perovskite solar cells are grown using a mixture of chemicals, and notable for a rapid improvement in how efficiently they are able to harness sunlight for energy. Ongoing experimentation involves readying perovskite cells for commercial use. The early perovskite cells degraded too quickly. Progress has been made but there is still work to do.

“It’s a real interesting problem,” Peshek said, “because these cells are notorious for having degradation problems. But the reason they degrade is because of moisture and oxygen. We don’t have to worry about that in space.”

Earth-bound experiments conducted in radiation test facilities demonstrate perovskite solar cells are surprisingly tolerant to radiation, said Joseph Luther, a senior scientist at NREL, co-adviser on the project, and an expert in perovskite technology. “They are very thin, and so that helps a lot. Most of the radiation just goes right through them. Silicon, relative to perovskites, is hundreds of times thicker. It’s also very cheap due to the production scale and is awesome for terrestrial PV applications, but in space it’s so thick that when radiation is impinging on the surface it gets absorbed and it damages the cell, causing problems.”

Lightweight perovskite solar cells would fit with NASA’s ongoing mission to reduce the price for putting a payload into orbit, from about $10,000 per pound today to hundreds of dollars a pound within a quarter-century.

“We’re very interested in trying to match the efficiency of the III-V solar cells, but do it in an extremely lightweight cell design,” Luther said. “Perovskites can be deposited on plastics or metal foils and things like that, which are comparatively lightweight.”

The efficiency of the solar cells was measured before leaving NREL and will be measured again upon their return. Both the cells and the component materials of the cells will also be characterized before and after flight, with imaging expertise provide by Steve Johnston. How well the perovskite cells and materials survived their trip will be immediately apparent. Lyndsey McMillon-Brown, a research engineer at NASA Glenn Research Center and principal investigator on the effort to bring working with Peshek on bringing perovskites to space, said a color change offers the first clue.

“The desirable phase for a perovskite solar cell is a black phase,” she said. “The film is jet black. However, when these things degrade, they turn into a yellowy mustard color. So we’re hoping to see black films upon their return.”

The lessons learned from the time the perovskites spend in space could help with the technology terrestrially. “Some of the things that we’re facing in space are extreme, like extreme temperature cycling, extreme UV exposure, but when you’re here on Earth you still have UV exposure and you still have temperature cycling,” McMillon-Brown said. “It’s just not as rapid and frequent. We’re still thinking that our lessons learned and our findings will apply and help make perovskites more marketable and gain a bigger commercial market share here on Earth, too.”

While waiting for the return of the perovskite samples, VanSant receives a regular reminder of the ongoing work. She signed up for text notifications about when the ISS is visible overhead. When the time is right and her 7- and 9-year-old daughters are awake, they try to spot the space station.

“In addition to watching the ISS go by in the night sky, we have also watched NASA’s video footage from cameras outside the ISS that show the Earth passing by as the ISS orbits,” VanSant said. “The launch of these cells has been a great reminder to look up into the night sky, but also an opportunity to see things from a completely different perspective.”

Courtesy of NREL.

 

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Yamaha throws in the towel, pulls out of e-bike market in North America

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Yamaha throws in the towel, pulls out of e-bike market in North America

Yamaha has announced to its dealers that it will be pulling its e-bikes out of the North American market at the end of this year. In the meantime, the brand says that it will offer sales of up to 60% off for its remaining inventory and continue to support its e-bikes already sold in the US for at least five more years.

Yamaha’s electric bikes have been well-received in global markets and have also received rave reviews in the US. However, the company’s higher prices make it harder to compete in the North American market, which is dominated by value-oriented models with significantly lower price points.

Yamaha’s various electric bikes designed for commuting, fitness, and mountain biking all feature higher-end components, which has resulted in the company competing more directly with premium bicycle shops. The company’s elaborate frames and in-house motors have added value to their models, yet have also contributed to a more premium price range.

Meanwhile, Yamaha hasn’t been immune to the same sales slowdown and overstocking issues that have plagued the e-bike industry over the last few years, as the company explained to its dealers in the letter seen below.

“Dear Yamaha eBike Dealer,

We want to thank you for your partnership and for your business in purchasing and retailing Yamaha eBikes, and for proudly representing the Yamaha brand. However, as you know, the combination of a post-COVID oversupply within the entire bicycle industry, coupled with a significant softening of the market, has resulted in a particularly challenging business environment where it is extremely difficult to achieve a sustainable business model. Given these market conditions, we regret to inform you that Yamaha has made the difficult decision to withdraw from the U.S. eBike business and cease wholesaling units effective the end of this year.

Yamaha Motor Corporation, U.S.A. (YMUS) entered the U.S. eBike market in 2018, and we have enjoyed the opportunity to partner with you these past six years to sell exciting, high-quality, all-road, mountain, and fitness/lifestyle eBikes.

We will continue to support your dealership in the sell down of your inventory by extending the current “Fan Promotion” program where customers may receive up to 60% off their purchase of a new Yamaha eBike. This “Fan Promotion” program will be offered on all units retailed and warranty registered through June 30, 2025. YMUS will continue to provide parts, service, and customer support in the United States both now and in support of our limited 5-year warranty.

Finally, we wish to express our sincere appreciation and gratitude to you and your staff for your dedication and support of the Yamaha eBike business.

Thank you for your understanding and support.”

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Toyota to buy clean power from a $1.1 billion solar farm in Texas

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Toyota to buy clean power from a .1 billion solar farm in Texas

Enbridge, a Canadian energy company, just announced it’s moving forward with an 815-megawatt (MW) solar project called Sequoia in Texas. When it’s done, it’ll be one of the largest solar farms in North America. The project’s price tag is a hefty $1.1 billion.

Enbridge’s Sequoia, around 150 miles west of Dallas, has already landed long-term power purchase agreements (PPAs) with AT&T and Toyota, ensuring most of its output is sold for years to come. This deal was highlighted in Enbridge’s third-quarter report on Friday.

Sequoia will be built in two phases, with power expected to start flowing in 2025 and 2026. Enbridge says it’s taken steps to reduce risks by securing equipment and procurement contracts in advance. Permits and purchase orders are also locked down.

Toyota’s PPA with Enbridge’s Texas solar project is part of Toyota’s broader push toward sustainability, as the automaker aims to achieve net zero by 2035 and match 45% of its purchased power with renewable electricity by 2026 as it still clings to its “diverse powertrain strategy.”


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NIO’s EV sales top 20,000 for the sixth straight month as new low-cost SUV shows promise

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NIO's EV sales top 20,000 for the sixth straight month as new low-cost SUV shows promise

With its new electric SUV rolling out, NIO’s (NIO) sales topped the 20,000 mark again in Oct, its sixth straight month hitting the milestone.

NIO sold 20,976 vehicles last month, up 30.5% from October 2023. The NIO brand sold 16,657 vehicles, while its new “family-oriented smart vehicle brand,” Onvo, contributed 4,319 in its first full sales month.

After launching its new mid-size Onvo L60 electric SUV in September, NIO said production and deliveries are steadily ramping up.

At the end of October, NIO’s Onvo had 166 Centers and Spaces throughout 60 cities. Onvo plans to continue expanding its network to drive future growth.

NIO’s new electric SUV starts at around $21,200 (149,900) and is a direct rival to Tesla’s Model Y. The base $21K model is if you rent the battery. Even with the battery included, Onvo L60 prices still start at under $30,000 (206,900 yuan), with a CLTC range of up to 341 miles (555 km). That’s still less than the Model Y.

Tesla’s Model Y RWD starts at around $35,000 (249,900 yuan) with 344 mi (554 km) CLTC range in China.

NIO's-Oct-sales
Onvo L60 electric SUV models (Source: NIO Onvo)

NIO’s new Onvo brand drives higher Oct sales

NIO has often compared its new electric SUV to the Model Y, claiming it’s superior in many ways. The L60 has better consumption at 12.1 kWh/100km compared to the Model Y at 12.5 kWh/100km).

With a longer wheelbase (2,950 mm vs 2,890 mm), NIO’s electric SUV also provides slightly more interior space.

NIO's-Oct-sales
NIO Onvo L60 electric SUV (Source: Onvo)

Despite the L60’s success so far, NIO believes its second Onvo model will be an even bigger hit. It could be a potential game-changer.

“If you think the L60 is good, then this new model is a much more competitive product,” NIO’s CEO William Li told CnEVPost after launching the L60. Onvo will launch a new EV every year. Following the L60, Onvo will launch a new mid-to-large-size electric SUV next year.

NIO’s leader claims the new model will be revolutionary. According to Li, it will offer even more surprises than the L60. Deliveries are planned to begin in Q3 2025.

NIO Onvo L60 vs Tesla Model Y trims Range
(CLTC)
Starting Price
NIO Onvo L60 (Battery rental) 555 km (341 mi)
730 km (454 mi)
149,900 yuan ($21,200)
NIO Onvo L60 (60 kWh) 555 km (341 mi) 206,900 yuan ($29,300)
NIO Onvo L60 (85 kWh) 730 km (454 mi) 235,900 yuan ($33,400)
NIO Onvo L60 (150 kWh) +1,000 km (+621 mi) TBD
Tesla Model Y RWD 554 km (344 mi) 249,900 yuan ($34,600)
Tesla Model Y AWD Long Range 688 km (427 mi) 290,900 yuan ($40,300)
Tesla Model Y AWD Performance 615 km (382 mi) 354,900 yuan ($49,100)
NIO Onvo L60 compared to Tesla Model Y prices and range in China

Local reports suggest a six-or seven-seat electric SUV could hit the market even sooner. With rumors of a launch around Q1 2025, deliveries could happen as soon as May 2025.

According to sources close to the matter, the L60 is just a “stepping stone” with even more exciting EVs on the way. The source claimed the new six-seat option will start at around $42,100 (300,000 yuan).

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