Subscribe to our free daily newsletters
  Energy News  




Subscribe to our free daily newsletters



ENERGY TECH
New efficient, low-temperature catalyst for hydrogen production
by Staff Writers
Upton NY (SPX) Jun 23, 2017


Brookhaven Lab chemists Ping Liu and Jose Rodriguez helped to characterize structural and mechanistic details of a new low-temperature catalyst for producing high-purity hydrogen gas from water and carbon monoxide.

Scientists have developed a new low-temperature catalyst for producing high-purity hydrogen gas while simultaneously using up carbon monoxide (CO). The discovery-described in a paper set to publish online in the journal Science on Thursday, June 22, 2017-could improve the performance of fuel cells that run on hydrogen fuel but can be poisoned by CO.

"This catalyst produces a purer form of hydrogen to feed into the fuel cell," said Jose Rodriguez, a chemist at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory. Rodriguez and colleagues in Brookhaven's Chemistry Division-Ping Liu and Wenqian Xu-were among the team of scientists who helped to characterize the structural and mechanistic details of the catalyst, which was synthesized and tested by collaborators at Peking University in an effort led by Chemistry Professor Ding Ma.

Because the catalyst operates at low temperature and low pressure to convert water (H2O) and carbon monoxide (CO) to hydrogen gas (H2) and carbon dioxide (CO2), it could also lower the cost of running this so-called "water gas shift" reaction.

"With low temperature and pressure, the energy consumption will be lower and the experimental setup will be less expensive and easier to use in small settings, like fuel cells for cars," Rodriguez said.

The gold-carbide connection
The catalyst consists of clusters of gold nanoparticles layered on a molybdenum-carbide substrate. This chemical combination is quite different from the oxide-based catalysts used to power the water gas shift reaction in large-scale industrial hydrogen production facilities.

"Carbides are more chemically reactive than oxides," said Rodriguez, "and the gold-carbide interface has good properties for the water gas shift reaction; it interacts better with water than pure metals."

"The group at Peking University discovered a new synthetic method, and that was a real breakthrough," Rodriguez said. "They found a way to get a specific phase-or configuration of the atoms-that is highly active for this reaction."

Brookhaven scientists played a key role in deciphering the reasons for the high catalytic activity of this configuration. Rodriguez, Wenqian Xu, and Siyu Yao (then a student at Peking University but now a postdoctoral research fellow at Brookhaven) conducted structural studies using x-ray diffraction at the National Synchrotron Light Source (NSLS) while the catalyst was operating under industrial or technical conditions. These operando experiments revealed crucial details about how the structure changed under different operating conditions, including at different temperatures.

With those structural details in hand, Zhijun Zuo, a visiting professor at Brookhaven from Taiyuan University of Technology, China, and Brookhaven chemist Ping Liu helped to develop models and a theoretical framework to explain why the catalyst works the way it does, using computational resources at Brookhaven's Center for Functional Nanomaterials (CFN).

"We modeled different interfaces of gold and molybdenum carbide and studied the reaction mechanism to identify exactly where the reactions take place-the active sites where atoms are binding, and how bonds are breaking and reforming," she said.

Additional studies at Oak Ridge National Laboratory's Center for Nanophase Materials Sciences (CNMS), the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory, and two synchrotron research facilities in China added to the scientists' understanding.

"This is a multipart complex reaction," said Liu, but she noted one essential factor: "The interaction between the gold and the carbide substrate is very important. Gold usually bonds things very weakly. With this synthesis method we get stronger adherence of gold to molybdenum carbide in a controlled way."

That configuration stabilizes the key intermediate that forms as the reaction proceeds, and the stability of that intermediate determines the rate of hydrogen production, she said.

The Brookhaven team will continue to study this and other carbide catalysts with new capabilities at the National Synchrotron Light Source II (NSLS-II), a new facility that opened at Brookhaven Lab in 2014, replacing NSLS and producing x-rays that are 10,000 times brighter.

With these brighter x-rays, the scientists hope to capture more details of the chemistry in action, including details of the intermediates that form throughout the reaction process to validate the theoretical predictions made in this study.

Research Report: "Atomic layered Au clusters on MoC as catalyst for the low temperature water gas shift reaction"

ENERGY TECH
Zig-zagging device focuses high-energy radiation emissions
Washington DC (SPX) Jun 16, 2017
There's no substitute for using the right tool for the job at hand. Using low-energy radiation sources simply isn't suitable for certain tasks: equipment used in cancer treatment requires a strong, monochromatic source of radiation to produce hard X-rays. Other similar radiation sources find applications in nuclear waste processing. To design devices that steadily emit a specific type of r ... read more

Related Links
Brookhaven National Laboratory
Powering The World in the 21st Century at Energy-Daily.com


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

ENERGY TECH
Low-carbon trajectory is the only option, European leaders say

Divestment streak continues for British energy company Centrica

New ultrathin material for splitting water could make hydrogen production cheaper

Keeping the hydrogen coming

ENERGY TECH
Zig-zagging device focuses high-energy radiation emissions

A seaweed derivative could be just what lithium-sulfur batteries need

Rosatom Develops Radiation-Powered Electricity Source for Medicine, Outer Space

A 100-year-old physics problem has been solved at EPFL

ENERGY TECH
Thrive Renewables delivers mezzanine funded wind farms in Scotland

It's a breeze: How to harness the power of the wind

ADB: Asia-Pacific growth tied to renewables

GE Energy Financial Services Surpasses $15 Billion in Renewable Energy Investments

ENERGY TECH
Photopower for microlabs

Freshwater from salt water using only solar energy

SOVENTIX and Gentec EPC sign a joint venture agreement to develop solar hybrid projects across Nigeria

Pacific island nations get renewable energy support

ENERGY TECH
UK nuclear plant to cost consumers billions more

Toshiba delays results again citing US nuclear unit

AREVA obtains transport license for its new cask in France and Belgium

NWMO to Focus Field Studies on Fewer Communities

ENERGY TECH
Corn better used as food than biofuel

Discovery could lead to sustainable ethanol made from carbon dioxide

Researchers produce biofuel for conventional diesel engines

Scientists make plastic from sugar and carbon dioxide

ENERGY TECH
Rosneft aims to export Egyptian natural gas

Seismic surveys responsible for high zooplankton mortality rates

Best days ahead for oil-rich Canada, prime minister says

New research reveals impact of seismic surveys on zooplankton

ENERGY TECH
NASA-MIT Study Evaluates Efficiency of Oceans as Heat Sink, Atmospheric Gases Sponge

How the climate can rapidly change at tipping points

Climate change more important than partisan politics: Schwarzenegger

Starvation looms as food runs out in drought-hit Ethiopia




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement