联系我们  |  网站地图  |  English   |  移动版  |  中国科学院 |ARP
站内搜索:
首页 简介 管理部门 科研部门 支撑部门 研究队伍 科研成果 成果转化 研究生教育 党建与创新文化 科普 信息公开 办公内网
科技信息
Low-cost wearables manuf...
Researchers develop 3-D-...
硫化钴能用来制作超级电容
青岛能源所在石墨炔能源存...
二维非铅钙钛矿动力学机理...
Scientists fine-tune sys...
Amorphous diamond synthe...
化学耦合的硫化镍和碳空心...
全无机钙钛矿光电探测器动...
科研人员提出纳米催化医学...
Newly-discovered semicon...
Molecular nanoparticles ...
碳纳米点固态高效发光新方法
基于甲胺气体的钙钛矿薄膜...
新型镁电池可使储能技术更...
现在位置:首页>新闻动态>科技信息
Scientists fine-tune system to create 'syngas' from CO2
2017-09-07 10:56:36 | 编辑: | 【 【打印】【关闭】

 

Schematic depicting the production of syngas from carbon dioxide and water. Bare gold catalysts make syngas mixtures that are rich in carbon monoxide, whereas gold catalysts enriched with copper make syngas mixtures that are more hydrogen rich. Credit: Michael Ross/Berkeley Lab

  Scientists have developed a new recipe for creating synthesis gas mixtures, or syngas, that involves adding a pinch of copper atoms sprinkled atop a gold surface. The new material supports a room-temperature electrochemical reaction that can convert carbon dioxide and water into syngas, a mixture of carbon monoxide and hydrogen, and an important precursor in the production of chemicals and synthetic fuels.

  The researchers say syngas can be converted downstream into small molecules, like ethanol, or larger hydrocarbons, such as those in gasoline, by fermentation or thermochemistry. Designing a material and a process that can easily control the composition of syngas would be an important improvement in reducing the environmental impacts of those industrial processes.

  They describe their design in a paper recently published in the Journal of the American Chemical Society. The study was led by Peidong Yang, senior faculty scientist at the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) Materials Sciences Division, and Edward Sargent, professor at the University of Toronto's Department of Electrical and Computer Engineering.

  "We know of no other single electrocatalyst that combines high production rates with such wide-ranging syngas composition control," said Yang, who is also a professor of chemistry at the University of California, Berkeley. "Many processes that utilize syngas require different compositions of gas, so we wanted to create a family of electrocatalysts that can be easily tunable."

 

Shown is a scanning electron microscope image of nanostructured syngas catalysts. Credit: Michael Ross/Berkeley Lab

  The researchers found that they could control the amount of carbon monoxide and hydrogen generated by the electrocatalyst by adjusting the amount of copper atoms layered onto a nanostructured gold surface.

  "The copper changes the strength with which CO2 binds with the surface," said study lead author Michael Ross, a postdoctoral researcher in Yang's lab. "A nanostructured surface that is primarily gold yields mostly carbon monoxide. To produce a mixture that is more hydrogen-rich, we add more copper."

  The researchers used X-ray photoelectron spectroscopy techniques at Berkeley Lab's Molecular Foundry to quantify the amount of copper on the gold electrocatalyst needed to create different syngas mixtures. For example, a 1-atom-thick layer of copper covering the gold surface can produce a 2-to-1 mixture of hydrogen to carbon monoxide. When the gold is left unadulterated, the hydrogen-to-carbon monoxide mix is 1-to-10, demonstrating wide flexibility in syngas output.

  "If these electrocatalysts could be scaled up to work in industrial reactors, we could make syngas using renewably generated electricity and CO2," said Ross. "Syngas is currently being converted into methanol, diesel fuel, and other useful chemicals all over the world. This could make the production of these chemicals much more sustainable."

  Explore further: Researchers develop technique to reuse carbon dioxide and methane 

  More information: Michael B. Ross et al. Tunable Cu Enrichment Enables Designer Syngas Electrosynthesis from CO2, Journal of the American Chemical Society (2017). DOI: 10.1021/jacs.7b04892 

  Journal reference: Journal of the American Chemical Society 

版权所有 中国科学院上海硅酸盐研究所 沪ICP备05005480号
长宁园区地址:上海市长宁区定西路1295号 电话:86-21-52412990 传真:86-21-52413903 邮编:200050
嘉定园区地址:上海市嘉定区和硕路585号  电话:86-21-69906002 传真:86-21-69906700 邮编:201899