您现在的位置是:Clean energy breakthrough produces hydrogen from sea water for cheap >>正文
Clean energy breakthrough produces hydrogen from sea water for cheap
上海品茶网 - 夜上海最新论坛社区 - 上海千花论坛6415人已围观
简介By subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time.Aiming to...
By subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time.
Aiming to extract hydrogen for energy generation, scientists are looking at various ways of production, especially ones that do not strain existing natural resources.
In a breakthrough, an international team of scientists from the University of Adelaide has devised a cost-effective method to split seawater to produce hydrogen directly. The research gains significance as earlier methods needed seawater to be treated using an energy-intensive process before splitting it using electrolysis.
The team has published their research in the journal Nature Energy. "We have split natural seawater into oxygen and hydrogen with nearly 100 percent efficiency to produce green hydrogen by electrolysis, using a non-precious and cheap catalyst in a commercial electrolyzer," said Shizhang Qiao, a professor at the university, in a news release.
See AlsoRecently, a team of researchers in China developed a membrane-based seawater electrolyzer capable of directly splitting seawater to produce hydrogen.
An efficient process to produce Hydrogen
The team used a low-cost catalyst, which is cobalt oxide coated with chromium oxide on its surface. The process used seawater without being subjected to treatment stages like reverse osmosis desolation, purification, or alkalization.
Researchers were able to match the performance of a commercial electrolyzer with their catalyst and seawater to a system with platinum/iridium catalysts running in a feedstock of highly purified deionized water.
According to the team, the process helps supplement the supply of hydrogen to wholly or partially replace fossil fuel-powered energy sources while relieving the pressure on the need for utilizing limited freshwater sources around the globe.
Seawater, an ideal source for generating hydrogen
The abundance of seawater around the globe makes it an ideal natural feedstock electrolyte to generate hydrogen, which is increasingly becoming a source of green energy in various sectors. However, such a process isn't practical for scarce seawater regions.
Also, researchers still have to deal with a few issues with seawater electrolysis as it exhibits increased electrode side reactions and corrosion arising from the complexities of using seawater compared to pure water.
"It is always necessary to treat impure water to a level of water purity for conventional electrolyzers, including desalination and deionization, which increases the operation and maintenance cost of the processes," said Zao Zheng, an associate professor at the university.
The team is currently working to scale up the system by using a "larger electrolyzer so that it can be used in commercial processes such as hydrogen generation for fuel cells and ammonia synthesis."
Abstract
The use of vast amounts of high-purity water for hydrogen production may aggravate the shortage of freshwater resources. Seawater is abundant but must be desalinated before use in typical proton exchange membrane (PEM) electrolyzers. Here we report direct electrolysis of real seawater that has not been alkalized nor acidified, achieving long-term stability exceeding 100 h at 500 mA cm−2 and similar performance to a typical PEM electrolyzer operating in high-purity water. This is achieved by introducing a Lewis acid layer (for example, Cr2O3) on transition metal oxide catalysts to dynamically split water molecules and capture hydroxyl anions. Such in situ generated local alkalinity facilitates the kinetics of both electrode reactions and avoids chloride attack and precipitate formation on the electrodes. A flow-type natural seawater electrolyzer with Lewis acid-modified electrodes (Cr2O3–CoOx) exhibits the industrially required current density of 1.0 A cm−2 at 1.87 V and 60 °C.
Tags:
转载:欢迎各位朋友分享到网络,但转载请说明文章出处“上海品茶网 - 夜上海最新论坛社区 - 上海千花论坛”。http://www.jz08.com.cn/news/4392.html
相关文章
China reveals grand vision for space resource utilization
Clean energy breakthrough produces hydrogen from sea water for cheapBy subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time.Chinese s...
阅读更多
New camera system detects building air leaks in real time
Clean energy breakthrough produces hydrogen from sea water for cheapBy subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time.Scientist...
阅读更多
Boson Protocol buys Decentraland real estate
Clean energy breakthrough produces hydrogen from sea water for cheapThe protocol aims to create a freeport where players can trade tokenised items redeemable for real-w...
阅读更多
热门文章
最新文章
Can you improve on the ISS? Starlab could fit the bill
FBI seized 63.7 bitcoins paid to Colonial Pipeline hackers
New system captures fog and turns it into clean water
Ledger to delay recovery feature as it open sources code
TON launches $25 million accelerator program
Has institutional money left crypto?