相关实验视频
Updated: Jun 25, 2025
06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.3K
双氧化物可逆沉积/溶解以调节电解质pH,使高性能水性离子电池成为可能
Yueang Jin1, Xueqian Zhang2, Yongchun Zhu
1School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China.
ACS applied materials & interfaces
|May 20, 2024
概括
这项研究引入了用于水性离子电池的新型VO2@MXene复合物,提高了稳定性和性能. 复合材料使用ZCOH副产品作为pH缓冲剂,改善循环寿命和容量保留.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 氧化瓦纳 (VO2) 是离子电池的有希望的阴极材料,但面临着导电性低和循环稳定性差等挑战.
- 在循环过程中副产品的积累和溶解阻碍了基于VO2的阴极的实际应用.
研究的目的:
- 为水性离子电池开发一种稳定,高性能的基于VO2的阴极.
- 为了研究一种特定的副产品,Zn12(CF3SO3) 9(OH) 15·nH2O (ZCOH) 在提高电池性能方面的作用.
主要方法:
- VO2@MXene Ti3C2 (MV) 复合物的热水合成.
- 在3M Zn(CF3SO3) 2电解质中对MV//Zn细胞进行电化学测试.
- 在现场X射线衍射和在现场pH测量.
- 对于ZCOH分解能的理论计算.
主要成果:
- 合成的MV复合物证明了可逆的ZCOH形成和溶解,作为pH缓冲器.
- 现场研究证实了ZCOH的缓冲作用,增强了循环稳定性.
- 理论计算显示,与纯VO2相比,MV上的ZCOH分解能较低.
- 硬币电池在20,000个循环后实现了80.7%的容量保留,在15A g-1时达到65.1%.
- 一个软包装电池在2000个循环后保持了72.1%的容量.
结论:
- 该ZCOH副产品在VO2阴极的电化学循环中发挥着积极的,有益的作用.
- MV复合材料为开发高性能水性离子电池提供了一个可行的策略.
- 了解和控制副产品的行为对于推进氧化瓦纳阴极材料至关重要.
相关概念视频
01:08Electrodeposition
626
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
626
03:02Standard Electrode Potentials
43.7K
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...
43.7K
02:54Ions as Acids and Bases
23.7K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
23.7K
03:45Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
00:56Extraction: Advanced Methods
446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
03:00Electrolysis
26.3K
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...
26.3K