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Synergistic work of cations in anion exchange membranes for OH- transport in fuel cells

Anion exchange membrane fuel cells (AEMFCs) have gained attention in the process of fuel cell development because they operate in alkaline environments,…

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5 months ago

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Anion exchange membrane fuel cells (AEMFCs) have gained attention in the process of fuel cell development because they operate in alkaline environments, the redox reaction rate at the electrodes is faster, and non-precious metal catalysts such as Ni, Co, and Ag can be used, which reduces the cost of fuel cells. However, the mobility of OH– is only 56.97% of that of H+ under the same conditions, and its stability is poor, so improving the ionic conductivity and mechanical properties of anion exchange membranes (AEM) is the key to the commercialization of AEMFC. Recently, a team of scientists has constructed a poly (p-terphenyl isatin) anion exchange membrane with quaternary ammonium and piperidine cations synergistic functionalization that provides excellent mechanical properties and OH-ion conductivity for alkaline anion membrane fuel cells. Their work is published in the journal Industrial Chemistry & Materials on 14 September 2023.

Credit: Zhe Wang, Changchun University of Technology, Changchun, China.

Anion exchange membrane fuel cells (AEMFCs) have gained attention in the process of fuel cell development because they operate in alkaline environments, the redox reaction rate at the electrodes is faster, and non-precious metal catalysts such as Ni, Co, and Ag can be used, which reduces the cost of fuel cells. However, the mobility of OH– is only 56.97% of that of H+ under the same conditions, and its stability is poor, so improving the ionic conductivity and mechanical properties of anion exchange membranes (AEM) is the key to the commercialization of AEMFC. Recently, a team of scientists has constructed a poly (p-terphenyl isatin) anion exchange membrane with quaternary ammonium and piperidine cations synergistic functionalization that provides excellent mechanical properties and OH-ion conductivity for alkaline anion membrane fuel cells. Their work is published in the journal Industrial Chemistry & Materials on 14 September 2023.

AEM can act on alkaline fuel cells and in the form of transported OH–, greatly reducing production costs. This is a boost to the general application of clean energy, but the biggest challenge is the “trade-off” between the ionic conductivity and stability of anion exchange membranes. “Anion exchange membrane is an important component in fuel cells, and the performance of the membrane profoundly affects the performance and development of fuel cells. How to make a breakthrough in the performance of anion exchange membrane and how to achieve high power density are the issues that our research team has been exploring,” explains Zhe Wang, a professor at the Changchun University of Technology.

Most of the conventional anion exchange membrane polymer backbones contain ether bonds, whose subsequent reactions are not only toxic and harmful, but also highly susceptible to attack and degradation during OH– transport. Not only that, the presence of hydrophilic groups in the polymers containing ether-bonded structures may cause the AEM to dissolve too much, leading to a sharp decrease in its stability.

The researchers used a polymer backbone without ether bonds to fundamentally solve the problems associated with conventional backbones. The quaternary ammonium cation and piperidine cation in the anion exchange membrane work in concert to construct a tighter ion-transport channel, which reduces the activation energy required to transport OH– and facilitates the flow of OH– within the membrane. The piperidinium cation also has superior alkaline stability due to its cyclic conformation, while the alkali stability of a series of anion exchange membranes in the paper reached 800 h on the basis of the ether-bond-free backbone.

In addition to these aspects, the researchers also confirmed that the mechanical properties of poly (p-terphenyl isatin) series membranes are in an excellent state. The tensile strength of the pure membranes reaches more than 60 MPa, which provides a stable foundation for further functionalization of subsequent anion exchange membranes.

Looking ahead, the team hopes that their work will provide new ideas for the further development of anion exchange membranes. “Our next step will be to focus on targeting battery power density improvement to achieve the ultimate goal of industrialized application of anion-exchange membranes,” said Wang.

The research team includes Yiman Gu, Yanchao Zhang, Zhe Wang*, Di Liu, Yan Wang, Tianming Dong, Song Wang, Zhanyu Li, Jingyi Wu and Yijia Lei from the Changchun University of Technology.

This research is funded by the Natural Science Foundation of China, Jilin Provincial Science & Technology Department.

Industrial Chemistry & Materials is a peer-reviewed interdisciplinary academic journal published by Royal Society of Chemistry (RSC) with APCs currently waived. Icm publishes significant innovative research and major technological breakthroughs in all aspects of industrial chemistry and materials, especially the important innovation of the low-carbon chemical industry, energy, and functional materials.

Journal

Industrial Chemistry and Materials

DOI

10.1039/D3IM00077J

Method of Research

Experimental study

Subject of Research

Not applicable

Article Title

Synergistic functionalization of poly(p-terphenyl isatin) anion exchange membrane with quaternary ammonium and piperidine cations for fuel cells

Article Publication Date

14-Sep-2023

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Angry Shouting Aside, Here’s What Biden Is Running On

Angry Shouting Aside, Here’s What Biden Is Running On

Last night, Joe Biden gave an extremely dark, threatening, angry State of the Union…

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2 hours ago

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March 8, 2024

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Angry Shouting Aside, Here's What Biden Is Running On

Last night, Joe Biden gave an extremely dark, threatening, angry State of the Union address - in which he insisted that the American economy is doing better than ever, blamed inflation on 'corporate greed,' and warned that Donald Trump poses an existential threat to the republic.

But in between the angry rhetoric, he also laid out his 2024 election platform - for which additional details will be released on March 11, when the White House sends its proposed budget to Congress.

To that end, Goldman Sachs' Alec Phillips and Tim Krupa have summarized the key points:

Taxes

While railing against billionaires (nothing new there), Biden repeated the claim that anyone making under $400,000 per year won't see an increase in their taxes.  He also proposed a 21% corporate minimum tax, up from 15% on book income outlined in the Inflation Reduction Act (IRA), as well as raising the corporate tax rate from 21% to 28% (which would promptly be passed along to consumers in the form of more inflation). Goldman notes that "Congress is unlikely to consider any of these proposals this year, they would only come into play in a second Biden term, if Democrats also won House and Senate majorities."

Biden also called on Congress to restore the pandemic-era child tax credit.

Immigration

Instead of simply passing a slew of border security Executive Orders like the Trump ones he shredded on day one, Biden repeated the lie that Congress 'needs to act' before he can (translation: send money to Ukraine or the US border will continue to be a sieve).

As immigration comes into even greater focus heading into the election, we continue to expect the Administration to tighten policy (e.g., immigration has surged 20pp the last 7 months to first place with 28% in Gallup’s “most important problem” survey). As such, we estimate the foreign-born contribution to monthly labor force growth will moderate from 110k/month in 2023 to around 70-90k/month in 2024. -GS

Ukraine

Biden, with House Speaker Mike Johnson doing his best impression of a bobble-head, urged Congress to pass additional assistance for Ukraine based entirely on the premise that Russia 'won't stop' there (and would what, trigger article 5 and WW3 no matter what?), despite the fact that Putin explicitly told Tucker Carlson he has no further ambitions, and in fact seeks a settlement.

As Goldman estimates, "While there is still a clear chance that such a deal could come together, for now there is no clear path forward for Ukraine aid in Congress."

China

Biden, forgetting about all the aggressive tariffs, suggested that Trump had been soft on China, and that he will stand up "against China's unfair economic practices" and "for peace and stability across the Taiwan Strait."

Healthcare

Lastly, Biden proposed to expand drug price negotiations to 50 additional drugs each year (an increase from 20 outlined in the IRA), which Goldman said would likely require bipartisan support "even if Democrats controlled Congress and the White House," as such policies would likely be ineligible for the budget "reconciliation" process which has been used in previous years to pass the IRA and other major fiscal party when Congressional margins are just too thin.

So there you have it. With no actual accomplishments to speak of, Biden can only attack Trump, lie, and make empty promises.

Tyler Durden Fri, 03/08/2024 - 18:00

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United Airlines adds new flights to faraway destinations

The airline said that it has been working hard to "find hidden gem destinations."

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9 hours ago

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March 8, 2024

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Since countries started opening up after the pandemic in 2021 and 2022, airlines have been seeing demand soar not just for major global cities and popular routes but also for farther-away destinations.

Numerous reports, including a recent TripAdvisor survey of trending destinations, showed that there has been a rise in U.S. traveler interest in Asian countries such as Japan, South Korea and Vietnam as well as growing tourism traction in off-the-beaten-path European countries such as Slovenia, Estonia and Montenegro.

Related: 'No more flying for you': Travel agency sounds alarm over risk of 'carbon passports'

As a result, airlines have been looking at their networks to include more faraway destinations as well as smaller cities that are growing increasingly popular with tourists and may not be served by their competitors.

The Philippines has been popular among tourists in recent years.

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United brings back more routes, says it is committed to 'finding hidden gems'

This week, United Airlines  (UAL)  announced that it will be launching a new route from Newark Liberty International Airport (EWR) to Morocco's Marrakesh. While it is only the country's fourth-largest city, Marrakesh is a particularly popular place for tourists to seek out the sights and experiences that many associate with the country — colorful souks, gardens with ornate architecture and mosques from the Moorish period.

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"We have consistently been ahead of the curve in finding hidden gem destinations for our customers to explore and remain committed to providing the most unique slate of travel options for their adventures abroad," United's SVP of Global Network Planning Patrick Quayle, said in a press statement.

The new route will launch on Oct. 24 and take place three times a week on a Boeing 767-300ER  (BA)  plane that is equipped with 46 Polaris business class and 22 Premium Plus seats. The plane choice was a way to reach a luxury customer customer looking to start their holiday in Marrakesh in the plane.

Along with the new Morocco route, United is also launching a flight between Houston (IAH) and Colombia's Medellín on Oct. 27 as well as a route between Tokyo and Cebu in the Philippines on July 31 — the latter is known as a "fifth freedom" flight in which the airline flies to the larger hub from the mainland U.S. and then goes on to smaller Asian city popular with tourists after some travelers get off (and others get on) in Tokyo.

United's network expansion includes new 'fifth freedom' flight

In the fall of 2023, United became the first U.S. airline to fly to the Philippines with a new Manila-San Francisco flight. It has expanded its service to Asia from different U.S. cities earlier last year. Cebu has been on its radar amid growing tourist interest in the region known for marine parks, rainforests and Spanish-style architecture.

With the summer coming up, United also announced that it plans to run its current flights to Hong Kong, Seoul, and Portugal's Porto more frequently at different points of the week and reach four weekly flights between Los Angeles and Shanghai by August 29.

"This is your normal, exciting network planning team back in action," Quayle told travel website The Points Guy of the airline's plans for the new routes.

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Walmart launches clever answer to Target’s new membership program

The retail superstore is adding a new feature to its Walmart+ plan — and customers will be happy.

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9 hours ago

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March 8, 2024

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It's just been a few days since Target  (TGT)  launched its new Target Circle 360 paid membership plan. 

The plan offers free and fast shipping on many products to customers, initially for $49 a year and then $99 after the initial promotional signup period. It promises to be a success, since many Target customers are loyal to the brand and will go out of their way to shop at one instead of at its two larger peers, Walmart and Amazon.

Related: Walmart makes a major price cut that will delight customers

And stop us if this sounds familiar: Target will rely on its more than 2,000 stores to act as fulfillment hubs. 

This model is a proven winner; Walmart also uses its more than 4,600 stores as fulfillment and shipping locations to get orders to customers as soon as possible.

Sometimes, this means shipping goods from the nearest warehouse. But if a desired product is in-store and closer to a customer, it reduces miles on the road and delivery time. It's a kind of logistical magic that makes any efficiency lover's (or retail nerd's) heart go pitter patter. 

Walmart rolls out answer to Target's new membership tier

Walmart has certainly had more time than Target to develop and work out the kinks in Walmart+. It first launched the paid membership in 2020 during the height of the pandemic, when many shoppers sheltered at home but still required many staples they might ordinarily pick up at a Walmart, like cleaning supplies, personal-care products, pantry goods and, of course, toilet paper. 

It also undercut Amazon  (AMZN)  Prime, which costs customers $139 a year for free and fast shipping (plus several other benefits including access to its streaming service, Amazon Prime Video). 

Walmart+ costs $98 a year, which also gets you free and speedy delivery, plus access to a Paramount+ streaming subscription, fuel savings, and more. 

An employee at a Merida, Mexico, Walmart. (Photo by Jeffrey Greenberg/Universal Images Group via Getty Images)

Jeff Greenberg/Getty Images

If that's not enough to tempt you, however, Walmart+ just added a new benefit to its membership program, ostensibly to compete directly with something Target now has: ultrafast delivery. 

Target Circle 360 particularly attracts customers with free same-day delivery for select orders over $35 and as little as one-hour delivery on select items. Target executes this through its Shipt subsidiary.

We've seen this lightning-fast delivery speed only in snippets from Amazon, the king of delivery efficiency. Who better to take on Target, though, than Walmart, which is using a similar store-as-fulfillment-center model? 

"Walmart is stepping up to save our customers even more time with our latest delivery offering: Express On-Demand Early Morning Delivery," Walmart said in a statement, just a day after Target Circle 360 launched. "Starting at 6 a.m., earlier than ever before, customers can enjoy the convenience of On-Demand delivery."

Walmart  (WMT)  clearly sees consumers' desire for near-instant delivery, which obviously saves time and trips to the store. Rather than waiting a day for your order to show up, it might be on your doorstep when you wake up. 

Consumers also tend to spend more money when they shop online, and they remain stickier as paying annual members. So, to a growing number of retail giants, almost instant gratification like this seems like something worth striving for.

Related: Veteran fund manager picks favorite stocks for 2024

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