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 OA系统
科技信息
Hybrid indium–lithium a...
Scientists make atoms-th...
清华材料学院在超长寿命高...
低介电常数微波介质陶瓷基...
热释电红外传感器的成本优...
Researchers produce firs...
Nanoscale printing break...
钙钛矿微型激光器研究进展
无溶剂石墨烯重防腐涂料研...
综述:甲醇制烯烃反应中SA...
New study on graphene-wr...
Self-healing catalysts m...
锂金属负极稳定技术解析
南开大学参与新材料和可穿...
超灵敏脉搏传感器问世 提...
现在位置:首页>新闻动态>科技信息
Self-healing catalysts make it easier to store solar energy with water
2017-09-20 09:13:33 | 【 【打印】【关闭】

The self-assembly pathway used for self-healing catalysts. Credit: Costentin et al. ©2017 PNAS

  Currently one of the most efficient ways to store solar energy is to transfer the energy to catalysts that split water into hydrogen and oxygen. Then the hydrogen can either be used as a fuel or later recombined with oxygen to produce water and release electricity when needed.

  However, one of the problems with using water to store solar energy is that the catalysts are made of earth-abundant elements (such as manganese, cobalt, and nickel) that corrode in water with a neutral pH. To address this problem, researchers have designed self-healing catalysts that can regenerate themselves in the presence of other elements, such as negatively charged phosphate or borate ions.

  One of the remarkable features of the self-healing catalysts is that, as long as they are operating, there is no limit to the number of times that they can heal themselves.

  Now in a new paper published in the Proceedings of the National Academy of Sciences, two of the researchers who have developed the self-healing catalyst, Cyrille Costentin at Paris Diderot University and Daniel G. Nocera at Harvard University, have investigated how this process works at a more detailed level.

  "This paper provides a quantitative model for self-healing," Nocera told Phys.org. "It actually extends beyond energy and provides a roadmap for the design of any self-healing catalyst. The rule set is self-assembly and catalysis. If the energy input for operation of the catalyst is greater than that for self-assembly, then the catalyst should be self-healing. So the principles developed in this paper are general."

  As the researchers show in their work, a catalyst can self-heal if the self-healing process requires less energy than that needed for normal catalyst operation. A simple way to control the self-healing process is to adjust the pH of the solution, since the amount of energy required for these two processes depends on the pH.

  The researchers show that there is a critical pH "zone of self-healing" that depends on various factors, in particular the geometry of the water-splitting cell and the phosphate or borate buffer concentration. Fortunately for practical applications, the researchers show that self-healing can occur over a wide range of pH values, including at a neutral pH for typical cell geometries and buffer concentrations, which allows for most natural water sources to be used to store solar energy.

  Since much of the future demand for renewable energy is expected to come from low-income, developing countries, the ability to use local natural water sources instead of pure water for storing solar energy will offer a big advantage for implementing the technology cost-effectively and on a large scale. The researchers plan to work toward this goal in the future.

  "The next stage is prototyping," Nocera said. "We are using this catalyst in conjunction with CO2 and N2 fixing bacteria (papers from our group in Science in 2016 and PNAS in 2017) to make liquid fuels and fertilizer, renewably (using only air, water, and sunlight as inputs). These prototypes are currently being developed in India at this time."

  Explore further: Scientists produce robust catalyst to split water into hydrogen, oxygen 

  More information: Cyrille Costentin and Daniel G. Nocera. "Self-healing catalysis in water." Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.1711836114 

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