Scientists at Stanford University have designed an electrocatalytic mechanism that works like a mammalian lung to convert water into fuel. Their research, published December 20 in the journal Joule, could help existing clean energy technologies run more efficiently.
The act of inhaling and exhaling is so automatic for most organisms that it could be mistaken as simple, but the mammalian breathing process is actually one of the most sophisticated systems for two-way gas exchange found in nature. With each breath, air moves through the tiny, passage-like bronchioles of the lungs until it reaches diminutive sacs called alveoli. From there, the gas must pass into the bloodstream without simply diffusing, which would cause harmful bubbles to form. It’s the unique structure of the alveoli–including a micron-thick membrane that repels water molecules on the inside while attracting them on the outer surface–that prevents those bubbles from forming and makes the gas exchange highly efficient.
Scientists in senior author Yi Cui’s lab at the Department of Materials Science and Engineering at Stanford University drew inspiration from this process in order to develop better electrocatalysts: materials that increase the rate of a chemical reaction at an electrode. “Clean energy technologies have demonstrated the capability of fast gas reactant delivery to the reaction interface, but the reverse pathway–efficient gas product evolution from the catalyst/electrolyte interface–remains challenging,” says Jun Li, the first author of the study.
The team’s mechanism structurally mimics the alveolus and carries out two different processes to improve the reactions that drive sustainable technologies such as fuel cells and metal-air batteries.
The first process is analogous to exhalation. The mechanism splits water to produce hydrogen gas, a clean fuel, by oxidizing water molecules in the anode of a battery while reducing them in the cathode. Oxygen gas (along with the hydrogen gas) is rapidly produced and transported through a thin, alveolus-like membrane made from polyethylene–without the energy costs of forming bubbles.
The second process is more like inhalation and generates energy through a reaction that consumes oxygen. Oxygen gas is delivered to the catalyst at the electrode surface, so it can be used as reactant during electrochemical reactions.
Although it is still in the early phases of development, the design appears to be promising. The uncommonly thin nano-polyethylene membrane remains hydrophobic longer than conventional carbon-based gas diffusion layers, and this model is able to achieve higher current density rates and lower overpotential than conventional designs.
However, this lung-inspired design still has some room for improvement before it will be ready for commercial use. Since the nano-polyethylene membrane is a polymer-based film, it cannot tolerate temperatures higher than 100 degrees Celsius, which could limit its applications. The team believes this material may be replaced with similarly thin nanoporous hydrophobic membranes capable of withstanding greater heat. They are also interested in incorporating other electrocatalysts into the device design to fully explore their catalytic capabilities.
“The breathing-mimicking structure could be coupled with many other state-of-the-art electrocatalysts, and further exploration of the gas-liquid-solid three-phase electrode offers exciting opportunities for catalysis,” says Jun Li.
Learn more: A lung-inspired design turns water into fuel
The Latest on: Clean energy technologies
via Google News
The Latest on: Clean energy technologies
- Enel North America Official Energy Partner of Kraft Sports + Entertainment, Turns Gillette Stadium Green for New England Patriots Home Openeron September 6, 2019 at 9:12 am
The New England Patriots home opener, will be powered with clean energy through renewable ... Entertainment through cutting-edge energy services and technologies such as smart charging electric ...
- CleanChoice Energy Partners with MPOWERD to Gift Solar Lights to Residents without Poweron September 6, 2019 at 8:51 am
"As mission-aligned companies focused on clean technology, we are proud to be partnering with CleanChoice Energy in providing solar lanterns to those affected by Hurricane Dorian; light is a ...
- CGE Energy (CGEI) Advances its WIND-e20 Vertical Axis Wind Turbine Technologyon September 6, 2019 at 6:03 am
06, 2019 (GLOBE NEWSWIRE) -- CGE Energy, Inc. ( OTCPink: CGEI) is making advancements in multiple aspects of the development of their WIND•e20® vertical-axis wind turbine technology. The 105-foot WIND ...
- The Path to Clean Energy Will Be Very Dirtyon September 6, 2019 at 5:55 am
The phrase “clean energy” normally conjures up happy ... Demand for indium, also essential to solar technology, will more than triple and could end up skyrocketing by 920 percent.
- Clean Energy Investment Could Hit $2.6T This Decadeon September 5, 2019 at 8:27 am
The scale of investment going into clean energy represents a growing chunk of the money ... the biggest markets in 2018 compared with the year prior. The cost of renewable technologies has fallen ...
- Clean Energy Investment Is Set to Hit $2.6 Trillion This Decadeon September 5, 2019 at 7:00 am
The scale of investment going into clean energy represents a growing chunk of the money ... Solar is crystalline silicon PV with no tracking The cost of renewable technologies has fallen precipitously ...
- Pete Buttigieg unveils climate change plan that would cost more than $1 trillion and aim to create 3 million clean energy jobson September 4, 2019 at 4:00 am
the creation of a $250 billion Clean Energy Bank to finance innovative technologies, a $250 billion fund matched with $250 billion in private investment with American companies to lead development of ...
- A dog groomer’s search for cleaner power leads to a clean energy start-up developing a student-designed inventionon September 4, 2019 at 2:06 am
Judges from Lockheed Martin, Alamo Angels, Velocity TX, Active Capital, Targeted Technology and Geekdom chose the winners ... generator shopping for his dog grooming vans to becoming a clean energy ...
- Shell Leads Big Oil in the Race to Invest in Clean Energyon September 3, 2019 at 11:00 pm
Major oil companies are poised to do a record number of clean-energy deals this year ... “Shareholder pressure, evolving new technologies and rapidly changing consumer preferences have forced oil and ...
- Clean Energy a Win for America's Armed Forces, Veteranson September 1, 2019 at 3:27 am
For example, Sen. Lamar Alexander, R-Tenn., has announced a New Manhattan Project for Clean Energy. The five-year, 10-point proposal calls for harnessing the power of U.S. research and technology to ...
via Bing News