Single Supported Atoms Participate in Catalytic Processes
December 04, 2014 — Researchers recently predicted and demonstrated that single supported Pt atoms are highly active for NO oxidation. This work will impact determining the optimum loading of noble metals on emissions-treatment catalysts and design of low-temperature catalysts.
Understanding Why Silicon Anodes of Lithium-Ion Batteries Are Fast to Discharge but Slow to Charge
December 02, 2014 — Silicon anodes for lithium-ion batteries are capable of quickly delivering high power but charge at a much lower rate. High-power and high-rate performance of batteries is determined by the intrinsic electrochemical reaction rates. The forward and backward reaction rates for reversible electrochemical reactions are not necessarily identical.
Stable Separator Identified for High-Energy Batteries
November 04, 2014 — State-of-the-art scanning transmission electron microscopy (STEM) unveiled the structural stability of lithium lanthanum zirconium oxide (LLZO) garnet in aqueous media.
Digital Transfer Growth of Patterned 2D Metal Chalcogenides by Confined Nanoparticle Evaporation
October 28, 2014 — Researchers demonstrated a novel growth technique for the controlled synthesis of monolayer or few-layer 2D metal chalcogenide crystals that should prove useful for their scaled production for optoelectronic and energy applications.
A High-Energy Solid State Battery with an Extremely Long Cycle Life
October 15, 2014 — A high-voltage (5V) solid state battery has been demonstrated to have an extremely long cycle life of over 10,000 cycles. For a given size of battery, the energy stored in a battery is proportional to its voltage. Conventional lithium-ion batteries use organic liquid electrolytes that have a maximum operating voltage of 4.3 V.
Thermopower Enhancement in Designer Oxide Superlattices
August 12, 2014 — A layer-by-layer design of 2D oxide superlattices with precisely controlled interface compositions has improved the thermopower of oxide thermoelectrics by 300% compared to that of bulk counterparts. Controlling the 2D carrier density through a new materials design strategy is critical for developing highly efficient thermoelectrics.
Structure-dependent Properties Guide Catalyst Design for Oxygenates Conversion
August 06, 2014 — The catalytic transformation of oxygenates (i.e. aldehydes, alcohols, ketones) on metal oxides to generate value added products such as fuels and additives is of great importance industrially, yet is not well-understood. ORNL researchers have provided new insights into how oxygenates react on metal oxide particles with well-defined structures.
Pulsed Laser Deposition of Photoresponsive Two-Dimensional GaSe Nanosheet Networks
July 31, 2014 — Researchers demonstrated a pulsed laser deposition (PLD) approach to synthesize networks of interconnected metal chalcogenide (GaSe) nanosheets that exhibit high photoresponsivity.
Cooperative Growth of Large Single-Crystal Graphene Islands
June 12, 2014 — Researchers showed that it is possible to grow large, single-crystal graphene islands by controlling the nucleation density, which determines the growth mechanism.
Atom Substitution Gives Stable Performance of Solid Electrolytes
May 07, 2014 — The substitution of Ge for As in Li3AsS4 results in an exceptionally stable ionic conductivity versus temperature, and enhances the ionic conductivity by two orders of magnitude. The performance of solid state batteries is dramatically sensitive to temperature due to the energy barrier associated with Li ion motion.