用一个NiTi形状记忆合金爬上进化火山
Sreetama Ghosh1,2, Denver Haycock3, Neha Mehra3
1Dutch Institute for Fundamental Energy Research (DIFFER), 5612AJ Eindhoven, The Netherlands.
The journal of physical chemistry letters
|January 19, 2024
概括
研究人员开发了一种新的方法来增强性水的电解以生产绿色. 使用- (NiTi) 形状记忆合金,他们在高温下与催化剂相比,实现了优越的演化反应 (HER) 性能.
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
- 可持续能源 可持续能源
背景情况:
- 性水电解提供了一条可持续的途径,利用可再生能源生产绿色气.
- 与酸性环境相比,性环境中的演变反应 (HER) 动力学在性环境中明显较慢.
- 由于成本效益,非贵金属催化剂对于性HER是可取的.
研究的目的:
- 确定一种简单的方法来提高性演化反应 (HER) 的性能.
- 研究商用NiTi形状记忆合金作为高效的HER电催化剂的潜力.
主要方法:
- 利用商用NiTi形状记忆合金,利用它们在加热时从马氏体转变为奥氏体.
- 与 (Pt) 电催化剂相比,评估了奥氏体NiTi的HER性能.
- 运用密度函数理论 (DFT) 计算来分析奥氏体相的表面结构和结能.
主要成果:
- 奥斯泰尼特NiTi在80°C显著提高了HER的性能,在电流密度上高达50%的性能超过了最先进的Pt催化剂.
- 尼提的室温性能不佳,突出显示了其取决于温度的催化活性.
- DFT计算显示,奥氏体相的表面组合表现出HER的最佳结能,比金属Ni或Ti单独弱.
结论:
- NiTi形状记忆合金,特别是在它们的奥氏体阶段,代表了高效性HER的有希望的非贵金属催化剂.
- 易于相位转换和在高温下优异的性能使得NiTi成为绿色生产中贵金属催化剂的有吸引力的替代品.
相关概念视频
Hydrogen Bonds
8.5K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
8.5K
Temperature Dependent Deformation
149
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
149
Stress-Strain Diagram - Ductile Materials
723
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
723
Mechanical Characteristics of Steel
577
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
577
Plastic Deformations
129
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
129
Reduction of Alkenes: Catalytic Hydrogenation
12.0K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.0K


