酸混合电池的金电极
Yixin Li1, Yong Lu1, Youxuan Ni1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Haihe Laboratory of Sustainable Chemical Transformations, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China.
Journal of the American Chemical Society
|April 28, 2022
概括
昆阳极为水性电池提供可持续的,无石的解决方案,实现高能量密度和快速充/放电. 这些电池超越了商业选择,
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 水性电池对于大规模储能至关重要,但面临的局限性包括低能量密度,成本和安全问题 (例如电池中的金属树突).
- 像酸电池和Ni-MH电池这样的现有技术存在缺点,阻碍其广泛应用于电网规模的应用.
研究的目的:
- 使用可持续材料开发高能量密度,安全和成本效益的水性电池系统.
- 研究子作为内在无树突的阳极材料,并配合负担得起的阴极氧化还原对.
主要方法:
- 使用子作为阳极材料和Mn2+/MnO2作为阴极材料的电化学设计.
- 在KOH电解质中优化聚1,4-,并构建酸混合电解质系统.
- 制造和测试具有改进界面化学性的缩放式水性电池.
主要成果:
- 当与Mn2+/MnO2阴极相结合时,其理论能量密度为374 Wh kg−1.
- 优化的聚1,4-氨) 在300C速率下达到295mAhg-1的特定容量,在240mAcm-2下达到225mAhg-1.
- 实用的水性电池显示出2V输出,快速充/放电 (>95%容量在40秒内),电池能量密度为92Wh/kg-1,超过酸电池和Ni-MH电池.
结论:
- 基于金的水性电池为大规模储能提供了一个有前途的,无岩的,经济高效的替代方案.
- 快速的电化学动力学和高能量密度使得这些电池适合调节由间歇性可再生能源 (如太阳能和风能) 供电的电网.
相关概念视频
03:12Batteries and Fuel Cells
28.1K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
28.1K
02:47Voltaic/Galvanic Cells
58.6K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
58.6K
03:02Standard Electrode Potentials
45.2K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
45.2K
03:00Electrolysis
27.4K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
27.4K
02:41Concentration Cells
23.3K
A concentration cell is a type of a voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
Consider the following voltaic cell:
23.3K
01:17Ion Exchange
678
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
678