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Chemists ID Catalytic 'Key' for Converting CO2 to Methanol

Results from experiments and computational modeling studies that definitively identify the "active site" of a catalyst commonly used for making methanol from CO2 will guide the design of improved catalysts for transforming this pollutant to useful chemicals.

Cryo-Electron Microscopy Achieves Unprecedented Resolution Using New Computational Methods

Cryo-electron microscopy (cryo-EM)--which enables the visualization of viruses, proteins, and other biological structures at the molecular level--is a critical tool used to advance biochemical knowledge. Now Berkeley Lab researchers have extended cryo-EM's impact further by developing a new computational algorithm instrumental in constructing a 3-D atomic-scale model of bacteriophage P22 for the first time.

New Study Maps Space Dust in 3-D

A new Berkeley Lab-led study provides detailed 3-D views of space dust in the Milky Way, which could help us understand the properties of this dust and how it affects views of distant objects.

Single-Angle Ptychography Allows 3D Imaging of Stressed Materials

Scientists have used a new X-ray diffraction technique called Bragg single-angle ptychography to get a clear picture of how planes of atoms shift and squeeze under stress.

New Feedback System Could Allow Greater Control Over Fusion Plasma

A physicist has created a new system that will let scientists control the energy and rotation of plasma in real time in a doughnut-shaped machine known as a tokamak.

Towards Super-Efficient, Ultra-Thin Silicon Solar Cells

Researchers from Ames Laboratory used supercomputers at NERSC to evaluate a novel approach for creating more energy-efficient ultra-thin crystalline silicon solar cells by optimizing nanophotonic light trapping.

Study IDs Link Between Sugar Signaling and Regulation of Oil Production in Plants

UPTON, NY--Even plants have to live on an energy budget. While they're known for converting solar energy into chemical energy in the form of sugars, plants have sophisticated biochemical mechanisms for regulating how they spend that energy. Making oils costs a lot. By exploring the details of this delicate energy balance, a group of scientists from the U.

High-Energy Electrons Probe Ultrafast Atomic Motion

A new technique synchronized high-energy electrons with an ultrafast laser pulse to probe how vibrational states of atoms change in time.

Rare Earth Recycling

A new energy-efficient separation of rare earth elements could provide a new domestic source of critical materials.

Two-Dimensional MXene Materials Get Their Close-Up

Researchers have long sought electrically conductive materials for economical energy-storage devices. Two-dimensional (2D) ceramics called MXenes are contenders.


Three SLAC Employees Awarded Lab's Highest Honor

At a March 7 ceremony, three employees of the Department of Energy's SLAC National Accelerator Laboratory were awarded the lab's highest honor ­- the SLAC Director's Award.

Dan Sinars Represents Sandia in First Energy Leadership Class

Dan Sinars, a senior manager in Sandia National Laboratories' pulsed power center, which built and operates the Z facility, is the sole representative from a nuclear weapons lab in a new Department of Energy leadership program that recently visited Sandia.

ORNL, HTS International Corporation to Collaborate on Manufacturing Research

HTS International Corporation and the Department of Energy's Oak Ridge National Laboratory have signed an agreement to explore potential collaborations in advanced manufacturing research.

Jefferson Lab Director Honored with Energy Secretary Award

Hugh Montgomery, director of the Department of Energy's Thomas Jefferson National Accelerator Facility (Jefferson Lab), was awarded The Secretary's Distinguished Service Award by the Secretary of Energy earlier this year.

New Projects to Make Geothermal Energy More Economically Attractive

Geothermal energy, a clean, renewable source of energy produced by the heat of the earth, provides about 6 percent of California's total power. That number could be much higher if associated costs were lower. Now scientists at the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) have launched two California Energy Commission-funded projects aimed at making geothermal energy more cost-effective to deploy and operate.

Southern Research Project Advances Novel CO2 Utilization Strategy

The U.S. Department of Energy's Office of Fossil Energy has awarded Southern Research nearly $800,000 for a project that targets a more cost-efficient and environmentally friendly method of producing some of the most important chemicals used in manufacturing.

Harker School Wins 2017 SLAC Regional Science Bowl Competition

After losing its first match of the day to the defending champions, The Harker School's team won 10 consecutive rounds to claim victory in the annual SLAC Regional DOE Science Bowl on Saturday, Feb. 11.

Francis Alexander Named Deputy Director of Brookhaven Lab's Computational Science Initiative

Alexander brings extensive management and leadership experience in computational science research to the position.

Kalinin, Paranthaman Elected Materials Research Society Fellows

Two researchers at Oak Ridge National Laboratory, Sergei Kalinin and Mariappan Parans Paranthaman, have been elected fellows of the Materials Research Society.

Two PNNL Researchers Elected to Membership in the National Academy of Engineering

Two scientists at the Pacific Northwest National Laboratory will become members of the prestigious National Academy of Engineering.


High-Energy Electrons Probe Ultrafast Atomic Motion

A new technique synchronized high-energy electrons with an ultrafast laser pulse to probe how vibrational states of atoms change in time.

Rare Earth Recycling

A new energy-efficient separation of rare earth elements could provide a new domestic source of critical materials.

Modeling the "Flicker" of Gluons in Subatomic Smashups

A new model identifies a high degree of fluctuations in the glue-like particles that bind quarks within protons as essential to explaining proton structure.

Rare Nickel Atom Has "Doubly Magic" Structure

Supercomputing calculations confirm that rare nickel-78 has unusual structure, offering insights into supernovas.

Microbial Activity in the Subsurface Contributes to Greenhouse Gas Fluxes

Natural carbon dioxide production from deep subsurface soils contributes significantly to emissions, even in a semiarid floodplain.

Stretching a Metal Into an Insulator

Straining a thin film controllably allows tuning of the materials' magnetic, electronic, and catalytic properties, essential for new energy and electronic devices.

How Moisture Affects the Way Soil Microbes Breathe

Study models soil-pore features that hold or release carbon dioxide.

ARM Data Is for the Birds

Scientists use LIDAR and radar data to study bird migration patterns, thanks to the Atmospheric Radiation Measurement (ARM) Climate Research Facility.

The Future of Coastal Flooding

Better storm surge prediction capabilities could help reduce the impacts of extreme weather events, such as hurricanes.

Estimating Global Energy Use for Water-Related Processes

Scientists find that water-related energy consumption is increasing across the globe, with pronounced differences across regions and sectors.


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Harnessing Everyday Motion to Power Mobile Devices (Video)

Article ID: 615030

Released: 2014-03-15 23:45:00

Source Newsroom: American Chemical Society (ACS)

FOR IMMEDIATE RELEASE

Note to journalists: Please report that this research was presented at a meeting of the American Chemical Society.

Michael Bernstein

214-853-8005 (Dallas Press Center, March 14-19)

202-872-6042

m_bernstein@acs.org

Katie Cottingham, Ph.D.

214-853-8005 (Dallas Press Center, March 14-19)

301-775-8455

k_cottingham@acs.org

A press conference on this topic will be held Wednesday, March 19, at 10:30 a.m. Central time in Room A122/A123 of the Dallas Convention Center. Reporters can attend in person or access live video of the event and ask questions at the ACS Ustream channel http://www.ustream.tv/channel/acslive.

DALLAS, March 16, 2014 — Imagine powering your cell phone by simply walking around your office or rubbing it with the palm of your hand. Rather than plugging it into the wall, you become the power source. Researchers at the 247th National Meeting & Exposition of the American Chemical Society (ACS), the world’s largest scientific society, presented these commercial possibilities and a unique vision for green energy. To see a video of the team’s work, visit http://www.youtube.com/watch?v=AVhJ4G-7na4.

The meeting, attended by thousands of scientists, features more than 10,000 reports on new advances in science and other topics. It is being held at the Dallas Convention Center and area hotels through Thursday.

Zhong Lin Wang, Ph.D., and his team, including graduate student Long Lin who presented the work, have set out to transform the way we look at mechanical energy. Conventional energy sources have so far relied on century-old science that requires scattered, costly power plants and a grid to distribute electricity far and wide.

“Today, coal, natural gas and nuclear power plants all use turbine-engine driven, electromagnetic-induction generators,” Wang explained. “For a hundred years, this has been the only way to convert mechanical energy into electricity.”

But a couple of years ago, Wang’s team at the Georgia Institute of Technology was working on a miniature generator based on an energy phenomenon called the piezoelectric effect, which is electricity resulting from pressure. But to their surprise, it produced more power than expected. They investigated what caused the spike and discovered that two polymer surfaces in the device had rubbed together, producing what’s called a triboelectric effect — essentially what most of us know as static electricity.

Building on that fortuitous discovery, Wang then developed the first triboelectric nanogenerator, or “TENG.” He paired two sheets of different materials together — one donates electrons, and the other accepts them. When the sheets touch, electrons flow from one to the other. When the sheets are separated, a voltage develops between them.

Since his lab’s first publication on TENG in 2012, they have since boosted the power output density by a factor of 100,000, with the output power density reaching 300 Watts per square meter. Now with one stomp of his foot, Wang can light up a sheet with a thousand LED bulbs.

His group has incorporated TENG into shoe insoles, whistles, foot pedals, floor mats, backpacks and ocean buoys for a variety of potential applications. These gadgets harness the power of everyday motion from the minute (think vibrations, rubbing, stepping) to the global and endless (waves). These movements produce mechanical energy that has been around us all along, but scientists didn’t know how to convert it directly to usable power in a sustainable way until now.

The key to the huge leap in output and future improvements is the chemistry.

“The amount of charge transferred depends on surface properties,” Wang explained. “Making patterns of nanomaterials on the polymer films’ surfaces increases the contact area between the sheets and can make a 1,000-fold difference in the power generated.”

With those improvements, Wang said his group is now working on commercializing products to recharge cell phones and other mobile devices using TENG. Down the road, he envisions these nanogenerators can make a far bigger impact on a much larger scale. Researchers could use the technology to tap into the endless energy of ocean waves, rain drops and the wind all around us — with tiny generators rather than towering turbines — to help feed the world’s ever-growing energy demand, he said.

Wang acknowledges funding from the National Science Foundation, the U.S. Department of Energy, the National Institute for Materials in Japan, Samsung and the Chinese Academy of Sciences.

The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With more than 161,000 members, ACS is the world’s largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.

To automatically receive news releases from the American Chemical Society, contact newsroom@acs.org.

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CONTACT:

Zhong Lin Wang, Ph.D.

Georgia Institute of Technology

500 10th Street, NW

Atlanta, Ga. 30318

Phone: 404-894-8008

Email: zhong.wang@mse.gatech.edu

Website: http://www.nanoscience.gatech.edu

Title

Triboelectric nanogenerator for self-powered systems and active sensor networks

Abstract

Harvesting energy from our living environment is an effective approach for sustainable, maintenance-free, and green power source for wireless, portable, or implanted electronics. Our group has recently invented a triboelectric nanogenerator (TENG) to convert mechanical energy into electricity based on the coupling of triboelectrification and electrostatic induction. In the internal power-generation unit, a potential difference is created due to the charge transfer between two thin films that exhibit opposite triboelectric polarities; in the external load, electrons are driven to flow between two electrodes attached on the back sides of the films to balance the potential difference. The TENG has been investigated with three basic operation modes: vertical contact-separation mode, in-plane sliding mode, and single-electrode mode. Ever since the first report of the TENG in January 2012, the output power density of the TENG has been improved 5 orders of magnitude within 12 months. The area power density reaches 313 W/m2, volume density reaches 490 kW/m3, and a conversion efficiency of ∼60% has been demonstrated. The TENG can be applied to harvest all kinds of mechanical energy that is available but usually wasted in our daily life, such as human motion, wind vibration, rotating tire, flowing water, and more. Alternatively, the TENG can also be used as a self-powered sensor for actively detecting the static and dynamic processes arising from mechanical agitation using the voltage and current output signals of the TENG, respectively, with potential applications for touch pad and smart skin technologies. The output performance of the TENG could be enhanced through numerous ways, including rational selection of materials, physically-modified surface morphologies, or chemically functionalized nanostructures. The TENG is not only useful for self-powered portable electronics, but also provides us a new technological solution to the world's energy issue in the near future.