在化物系统中的基阴极上的La3+离子的电还原
Kailei Sun1, Linsheng Luo1, Xu Wang1
1College of Metallurgical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
ACS omega
|June 23, 2025
概括
这项研究证明了 (Ni) 阴极使用 (Ni) 阴极在盐中的 (La) 离子的电减. 这种方法有效地从废渣中回收有价值的稀土元素,形成LaNi合金.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
背景情况:
- 二次稀土资源的高价值回收需要有效地从稀土渣中再生 (La).
- 使用活性电极在盐系统中的电化学还原为La回收提供了一个有前途的途径.
研究的目的:
- 分析化物盐系统中Ni阴极上的La3+离子的电还原.
- 为了研究反应机制,动力学,和核化行为在La沉积过程中.
- 为了描述潜在应用所形成的合金产品.
主要方法:
- 循环电压测量,正方波电压测量和时频测量被用来研究电还原过程.
- 扫描电化学显微镜 (SECM) 用于可视化电极表面的La3+离子行为.
- 电子探针分析描述了电解后沉积产品的组成.
主要成果:
- 在 (LiF-LaF3) eut-La2O3在1223 K的电化学还原发生在两个步骤:La3+ + e → La2+和La2+ + 2e → La.
- 减少过程是扩散控制的,扩散系数为1.33×10−5cm·s−1.
- 拉3+离子的最佳激活发生在 -0.95 和 0.95 V (vs Ag/AgCl) 之间,产生拉3和拉5合金相.
结论:
- 该研究成功阐明了化盐中Ni阴极上的La3+的两步电还原机制.
- 这些发现表明,Ni 是一种有效的活性电极,用于从稀土渣中回收La.
- 形成LaNi3和LaNi5合金为二次稀土资源的高价值利用提供了途径.
更多相关视频
09:36In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
Published on: September 12, 2018
8.9K
07:55Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
12.8K
相关概念视频
Electrodeposition
729
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...
729
Acid Halides to Alcohols: LiAlH4 Reduction
3.1K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
3.1K
Electrolysis
27.3K
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...
27.3K
Nitriles to Amines: LiAlH4 Reduction
3.8K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.8K
Ionic Bonding and Electron Transfer
42.5K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
42.5K
Formation of Complex Ions
24.0K
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...
24.0K
