Computational

Demystifying Nonequilibrium Statistical Mechanics

Speaker(s): 
David Rogers
Dates: 
Thursday, August 31, 2017 - 4:00pm to 5:00pm

Recent general results on the statistics of nonequilibrium processes have opened up old debates between the exact dynamical and informational viewpoints on probability.  Many of the good properties of equilibrium systems are not rigorously provable without assuming ergodicity.  It turns out those arguments are even more relevant, and more pernicious, when working in a dynamical context.  Even though nonequilibrium research predates traditional equilibrium thermodynamics, it is still seen by many as a vast, uncharted territory.  In this talk, I show how there is a growing...

Graphane as an Efficient and Water-Free Hydrogen Fuel Cell Membrane

  • By Aude Marjolin
  • 8 May 2017

Hydrogen powered fuel cell cars, developed by almost every major car manufacturer, are ideal zero-emissions vehicles because they produce only water as exhaust. However, their reliability is limited because the fuel cell relies upon a membrane that only functions in when enough water is present, limiting the vehicle’s operating conditions. 

Karl Johnson and his group have found that the unusual properties of graphane – a two-dimensional polymer of carbon and hydrogen – could form a type of anhydrous “bucket brigade” that transports protons without the need for water, potentially leading to the development of more efficient hydrogen fuel cells for vehicles and other energy systems. Graduate research assistant Abhishek Bagusetty is the lead author on their paper “Facile Anhydrous Proton Transport on Hydroxyl Functionalized Graphane”, recently published in Physical Review Letters. Computational modeling techniques coupled with the high performance computational infrastructure at the University’s Center for Research Computing enabled them to design this potentially groundbreaking material. 

Structure-Activity Relations in Heterogeneous Catalysis – A View from Computational Chemistry

Speaker(s): 
Phillipe Sautet
Dates: 
Friday, March 17, 2017 - 9:30am to 10:30am

The understanding of the catalytic properties of nanoparticle catalysts and the design of optimal composition and structures demands fast methods for the calculation of adsorption energies. By exploring the adsorption of O and OR (R=OH, OOH, OCH3) adsorbates on a large range of surface sites with 9 transition metals, we propose new structure sensitive scaling relations between the adsorption energy of two adsorbates that are valid for all metals and for all surface sites.1 This opens the way for a new class of activity volcano plots where the descriptor is not an energy...

2016 Behrend Computational Materials Meeting, November 19, 2016

  • By Aude Marjolin
  • 1 November 2016

The Behrend Computational Materials Meeting 2016 will be held Saturday, November 19 from 10 am to 4 pm at Penn State Behrend (Erie, PA). The focus of the meeting will be on Atomic Level Methods and Applications

There is no participation fee, and lunch will be provided. To officially register, please fill out the form below. Registration deadline is Wednesday Nov. 9, 2016. (Early registrations preferred).

Questions or concerns?  Please e-mail Blair Tuttle at brt10@psu.edu

Venkat Viswanathan Awarded Funding to Stop Dendrite Formation in Li-ion Batteries

  • By Aude Marjolin
  • 19 September 2016

Energy expert Venkat Viswanathan have received funding from the U.S. Department of Energy’s Advanced Research Projects Agency – Energy (ARPA-E) to study the use of dendrite-blocking polymers in lithium-ion batteries. 

When charged repeatedly, lithium-ion batteries run the risk of overheating, and even catching fire. This is due to the formation of dendrites, or microscopic fibers of lithium that can form during the charging cycle. Over time, these dendrites can grow long enough that they connect the battery’s electrodes to one another, causing the battery to short-circuit and become a potential hazard. In order to fully implement future lithium-ion battery technologies, which could greatly increase the battery power of our smartphones, electric vehicles, and more, engineers need to find a way to stop these dendrites from forming.

Department of Mechanical Engineering, Carnegie Mellon University
Ph.D., Mechanical Engineering, Stanford University, 2013
Summary:

Venkat Viswanathan's research focus is on identifying the scientific principles governing material design, inorganic, organic and biomaterials, for novel energy conversion and storage routes. The material design is carried out through a suite of computational methods being developed in the group validated by experiments.  Some key research thrusts include identifying principles of electrolytes design (organic material) that can tune electrode catalysis, identification of new anode, cathode (inorganic materials) and electrolyte materials for next generation batteries, new electrocatalysts (inorganic) and biomaterials for energy storage and separation applications. In addition to material design, our group is involved in several cross-cutting areas such as battery controls, electric vehicle security and GPU accelerated computing.

Research interests:

  • Computational material design
  • Density functional theory simulations
  • Phase-field modeling
  • Next generation batteries, fuel cells
  • Electrocatalysis for energy conversion and storage
  • Data-driven material discovery
  • Bio-inspired and bio-mimetic materials
  • Controls for energy systems
  • GPU accelerated computing
Most Cited Publications
  1. "The Twin Problems of Interfacial Carbonate Formation in Non-aqueous Li-O 2 Batteries." Bryan D McCloskey, Angela Speidel, Rouven Scheffler, Dolores C Miller, Venkatasubramanian Viswanathan, Jens Strabo Hummelshøj, Jens K Norskov, Alan C Luntz. The Journal of Physical Chemistry Letters.
  2. "Solvating additives drive solution-mediated electrochemistry and enhance toroid growth in non-aqueous Li–O2 batteries." Nagaphani B Aetukuri, Bryan D McCloskey, Jeannette M García, Leslie E Krupp, Venkatasubramanian Viswanathan, Alan C Luntz. Nature Chemistry.
  3. "Electrical conductivity in Li2O2 and its role in determining capacity limitations in non-aqueous Li-O2 batteries." V Viswanathan, KS Thygesen, JS Hummelshoj, JK Norskov, G Girishkumar, BD McCloskey, AC Luntz. Journal of Chemical Physics.
  4. "Universality in Oxygen Reduction Electrocatalysis on Metal Surfaces." Venkatasubramanian Viswanathan, Heine Anton Hansen, Jan Rossmeisl, Jens K Nørskov. ACS Catalysis.
  5. "Practical challenges hindering the development of solid state Li ion batteries." Kian Kerman, Alan Luntz, Venkatasubramanian Viswanathan, Yet-Ming Chiang, Zhebo Chen. Journal of The Electrochemical Society.
Recent Publications
  1. "Benchmarking conductivity predictions of the Advanced Electrolyte Model (AEM) for aqueous systems." Adarsh Dave, Kevin L Gering, Jared M Mitchell, Jay Whitacre, Venkatasubramanian Viswanathan. Journal of The Electrochemical Society.
  2. "The Future of Vehicle Electrification in India May Ride on Two Wheels." Shashank Sripad, Tarun Mehta, Anil Srivastava, Venkatasubramanian Viswanathan. ACS Energy Letters.
  3. "An Autonomous Electrochemical Test stand for Machine Learning Informed Electrolyte Optimization." Jay F Whitacre, Jared Mitchell, Adarsh Dave, Sven Burke, Venkatasburamanian Viswanathan. J. Electrochem. Soc..
  4. "Uncertainty Quantification of DFT-predicted Finite Temperature Thermodynamic Properties within the Debye Model." Pinwen Guan, Gregory Houchins, Venkatasubramanian Viswanathan. arXiv preprint arXiv:1910.07891.
  5. "Computational Screening of Current Collectors for Enabling Anode-Free Lithium Metal Batteries." Vikram Pande, Venkatasubramanian Viswanathan. ACS Energy Letters.

Condensed Matter and Materials Theory (CMMT)

  • By Aude Marjolin
  • 7 September 2016

CMMT supports theoretical and computational materials research in the topical areas represented in DMR's core or individual investigator programs, which include: Condensed Matter Physics (CMP), Biomaterials (BMAT), Ceramics (CER), Electronic and Photonic Materials (EPM), Metals and Metallic Nanostructures (MMN), Polymers (POL), and Solid State and Materials Chemistry (SSMC). The program supports fundamental research that advances the conceptual understanding of hard and soft materials, and materials-related phenomena; the development of associated analytical, computational, and data-centric techniques; as well as predictive materials-specific theory, simulation, and modeling for materials research.

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