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The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
  • 2017-04-05 13:05:10
  • Article ID: 672474

Coming Together, Falling Apart, and Starting Over, Battery Style

New device shows what happens when electrode, electrolyte, and active materials meet in energy storage technologies

  • Credit: Image courtesy of Mike Perkins, PNNL.

    Designed at Pacific Northwest National Laboratory, the device lets scientists add designer molecules to an extremely well-defined electrochemical cell. They can then characterize the electrode-electrolyte interface while the cell is charged and discharged at technologically relevant conditions.

Whether inside your laptop computer or storing energy outside wind farms, we need high-capacity, long-lasting, and safe batteries. In batteries, as in any electrochemical device, critical processes happen where the electrolyte and active material meet at the solid electrode. However, determining what happens at the meeting point has been difficult because in addition to active molecules, interfaces often contain numerous inactive components. Led by Laboratory Fellow Dr. Julia Laskin, scientists at Pacific Northwest National Laboratory have now found a way to carefully design technologically important interfaces by soft landing active molecules onto a small solid-state electrochemical cell. They packed the electrolyte into a solid membrane, deposited active ions on top, and characterized the cell using traditional electrochemical techniques. The device they built allows them to study key reactions in real time in controlled gaseous environments.

"To increase performance, we need to study what takes place inside batteries or fuel cells— understand processes at the interface in real time as the reactions are happening," said Dr. Venkateshkumar Prabhakaran, first author of the study.

Why It Matters: The device provides a way to understand the basic breakdown reactions, material build-up, and other processes at the electrode surface during operation. Being able to gather this dynamic information is vital to building better batteries, fuel cells, and other energy devices. It also matters in improving the efficiency of industrial processes through electrocatalysis. "We are doing fundamental research on state-of-the-art technologically relevant interfaces," said Laskin.

Methods: At PNNL, scientists designed an electrochemical device to study the electrode-electrolyte interface in real time. The device uses a solid ionic-liquid membrane, in vacuum or other well-controlled environments, that has transport properties similar to a liquid electrolyte.

The solid membrane lets the team modify the electrolyte interface using ion soft-landing techniques. With soft landing, they place well-characterized active molecules at the interface. These molecules include catalytic metal clusters and redox-active "molecular battery" species capable of holding large numbers of electrons—potential candidates for boosting battery capacity.

In an exciting new twist, scientists can also add molecular fragments to the cell. They create the fragment ions by "smashing" precursor molecules in the gas phase. These gas-phase fragments may then be selected and added to the membrane. The result is a well-defined film that you can't typically make in solution. "This gives us access to a broad range of species that aren't stable under normal conditions and enables us to understand the contribution of individual building blocks to the overall activity of parent molecules," said Dr. Grant Johnson, a PNNL chemist and member of the team.

When the soft-landed clusters diffuse through the extremely thin membrane and reach the electrode surface of the newly designed device, the team has a detailed and precisely defined active species they can examine using several electrochemical and spectroscopic techniques. Once at the interface, the team can study how the active molecules change the transport of electrons, increasing capacity or depleting it, for example.

What's Next? The researchers are using the device to study how soft-landed noble metal clusters modify carbon dioxide to upgrade this common pollutant to more valuable chemical feedstocks.

Acknowledgments

Sponsors: This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences and Biosciences Division

User Facility: EMSL, the Environmental Molecular Sciences Laboratory, a DOE Office of Science User Facility at Pacific Northwest National Laboratory

Research Team: Venkateshkumar PrabhakaranGrant E. Johnson, Bingbing Wang, and Julia Laskin, Pacific Northwest National Laboratory

Reference: Prabhakaran V, GE Johnson, B Wang, and J Laskin. 2016. "In Situ Solid-State Electrochemistry of Mass-Selected Ions at Well-Defined Electrode-Electrolyte Interfaces." Proceedings of the National Academy of Sciences USA 113(47): 13324-13329. DOI: 10.1073/pnas.1608730113

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Rutgers Scientists Discover 'Legos of Life'

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Theoretical Physicist Elena Belova Named to Editorial Board of Physics of Plasmas

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Two Argonne Scientists Recognized for a Decade of Breakthroughs

Two scientists with the U.S. Department of Energy's (DOE) Argonne National Laboratory have been named to the Web of Science's Highly Cited List of 2017, ranking in the top 1 percent of their peers by citations and subject area. Materials Scientist Khalil Amine and Energy and Environmental Policy Scientist David Streets say they are thrilled to see their work -- and the laboratory -- recognized in such a way.

Argonne Welcomes Department of Energy Secretary Perry

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Argonne names John Quintana Deputy Laboratory Director for Operations and COO

John Quintana has been named Deputy Laboratory Director for Operations and Chief Operations Officer (COO) of the U.S. Department of Energy's (DOE) Argonne National Laboratory.

Developing Next-Generation Sensing Technologies

Recently, the Advanced Research Projects Agency-Energy (ARPA-E) announced $20 million in funding for 15 projects that will develop a new class of sensor systems to enable significant energy savings via reduced demand for heating and cooling in residential and commercial buildings.


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Exploring Past, Present, and Future Water Availability Regionally, Globally

New open-source software simulates river and runoff resources.

Arctic Photosynthetic Capacity and Carbon Dioxide Assimilation Underestimated by Terrestrial Biosphere Models

New measurements offer data vital to projecting plant response to environmental changes.

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Non-destructive technique identifies key variations in Alaskan soils, quickly providing insights into carbon levels.

Superconducting Tokamaks Are Standing Tall

Plasma physicists significantly improve the vertical stability of a Korean fusion device.

Graphene Flexes Its Muscle

Crumpling reduces rigidity in an otherwise stiff material, making it less prone to catastrophic failure.

Remotely Predicting Leaf Age in Tropical Forests

New approach offers data across species, sites, and canopies, providing insights into carbon uptake by forests.

What's the Noise Eating Quantum Bits?

The magnetic noise caused by adsorbed oxygen molecules is "eating at" the phase stability of quantum bits, mitigating the noise is vital for future quantum computers.

Rewritable Wires Could Mean No More Obsolete Circuitry

An electric field switches the conductivity on and off in atomic-scale channels, which could allow for upgrades at will.

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Water passes through human-made straws faster than the "gold standard" protein, allowing us to filter seawater.

Machine Learning Provides a Bridge to the Texture of the Quantum World

Machine learning and neural networks are the foundation of artificial intelligence and image recognition, but now they offer a bridge to see and recognize exotic insulating phases in quantum materials.


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