We value your privacy
Our site is supported by advertising and we and our partners use technology such as cookies on our site to personalize content and ads, provide social media features, and analyze our traffic. Click "I Accept" below to consent to the use of this technology across the web. You can change your mind and change your consent choices at any time by returning to this site and clicking the Privacy Choices link.
By choosing I Accept below you are also helping to support our site and improve your browsing experience.
Store and/or access information on a device
Apply market research to generate audience insights
Precise geolocation data, and identification through device scanning
Content measurement, and product development
Personalised ads, and ad measurement
Carbon-Coated Nickel Enables Fuel Cell Free of Precious Metals (eurekalert.org)
Posted by BeauHD on Wednesday March 30, 2022 @06:00AM from the enhanced-performance dept.
schwit1 shares a report from EurekAlert: A nitrogen doped carbon-coated nickel anode can catalyze an essential reaction in hydrogen fuel cells at a fraction of the cost of the precious metals currently used, Cornell University researchers have found. The new discovery could accelerate the widespread use of hydrogen fuel cells, which hold great promise as efficient, clean energy sources for vehicles and other applications. It's one of a string of discoveries for the Hector D. Abruna lab in their ongoing search for active, inexpensive, durable catalysts for use in alkaline fuel cells.
Recent experiments with nonprecious-metal HOR electrocatalysts needed to overcome two major challenges, the researchers wrote: low intrinsic activity from too strong a hydrogen binding energy, and poor durability due to rapid passivation from metal oxide formation. To overcome these challenges, the researchers designed a nickel-based electrocatalyst with a 2 nanometer shell made of nitrogen-doped carbon. Their hydrogen fuel cell has an anode (where hydrogen is oxidized) catalyst consisting of a solid nickel core surrounded by the carbon shell. When paired with a cobalt-manganese cathode (where oxygen is reduced), the resulting completely precious-metal-free hydrogen fuel cell outputs more than 200 milliwatts per square centimeter.
The presence of nickel oxide species on the surface of the nickel electrode slows the hydrogen oxidation reaction dramatically, Abruna said. The nitrogen-doped carbon coating serves as a protection layer and enhances the HOR kinetics, making the reaction quicker and much more efficient. In addition, the presence of the graphene coating on the nickel electrode prevents the formation of nickel oxides -- resulting in electrodes with dramatically enhanced lifetimes. These electrodes are also much more tolerant to carbon monoxide, which rapidly poisons platinum.The study has been published in the journal Proceedings of the National Academy of Sciences.
C'est magnifique, mais ce n'est pas l'Informatique. -- Bosquet [on seeing the IBM 4341]