旋转极化和相位转换辅助高效的整体水分离使用Ni50Mn18Ga25Cu7铁磁形状记忆Heusler合金
Mayank Tiwari1, Prashant K Bhartiya1, Neeraj Bangruwa1
1Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India.
ACS applied materials & interfaces
|December 10, 2024
概括
这项研究表明,一种特殊的---铜合金 (NMGC) 使用氧和进化反应有效地分裂水. 它的独特特性使其成为清洁能源生产的有希望的催化剂.
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
- 催化剂是一种催化剂.
背景情况:
- 铁磁形状记忆合金 (FSMA) 呈现出独特的相位过渡.
- 基于的合金正在探索用于催化应用.
- 水的分裂是生产的关键过程.
研究的目的:
- 为了研究水分裂的Ni50Mn18Ga25Cu7 (NMGC) 合金中半金属和形状记忆性能的协同催化效应.
- 评估NMGC在氧演化反应 (OER) 和演化反应 (HER) 中的电催化性能.
主要方法:
- 实验证明NMGC合金的催化活性.
- 用温度对NMGC进行相位过渡分析.
- 对OER和HER性能进行电化学测量.
- 对磁场对催化作用的研究.
主要成果:
- NMGC合金对OER和HER都表现出协同催化作用.
- 在NMGC的马石阶段显示出优越的电催化性能.
- 实现了高电流密度 (414 ± 3.8 mA/cm2) 和OER (220 ± 1.7 mV) 和HER (282 ± 2.2 mV) 的低超电位.
- 外部磁场显著降低了OER和HER的超电位.
结论:
- 在NMGC合金中,半金属性和形状记忆性质的结合使得高效的水分裂成为可能.
- NMGC是OER和HER的有希望的电催化剂,在生产中具有潜在的应用.
- 在NMGC中,旋转和相位工程在增强水分裂动力学方面发挥着至关重要的作用.
相关概念视频
Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Atomic Nuclei: Nuclear Relaxation Processes
622
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
622
Paramagnetism
2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Diamagnetism
2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K


