在中性介质中通过在双金属合金电催化剂的电荷调节位点上的差异性中间结合来实现的进化
Mamoni Maji1, Supriti Dutta2, Rohan Jena3
1Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER), Kolkata, Mohanpur, 741246, India.
Angewandte Chemie (International ed. in English)
|March 21, 2024
概括
泡上的-合金板显著降低了中性水分裂的能量屏障. 这一进步为进化反应提供了高效和低成本的替代品.
科学领域:
- 电化学和材料科学 材料科学
- 用于水分的催化剂.
背景情况:
- 高效的电催化剂对于中性水分解至关重要,这是生产的关键过程.
- 目前的催化剂,如,是昂贵的,在中性条件下面临限制.
- 了解催化剂-表面相互作用对于设计改进的电催化系统至关重要.
研究的目的:
- 为了研究Co85Mo15在Ni-泡 (NF) 上支的板的电催化活性,用于中性水分裂.
- 通过差异性中间结合来阐明增强演变反应 (HER) 活性的机制.
- 评估催化剂在中性,性和酸性介质中的性能.
主要方法:
- 合成的 Co85Mo15/NF 催化剂.
- 电化学表征包括超电位测量和转换频率 (TOF) 确定.
- 运行光谱分析以研究中间结合和电荷密度动态.
主要成果:
- 在1M酸盐缓冲溶液 (PBS) 中为HER在-10 mA cm-2下达到50±9 mV的低超电位.
- 证明了高TOF (0.18s−1) 和质量活动 (13.2A g−1),超过商业20%的Pt/C.
- 操作性研究显示OH*和H*在Moδ+和Coδ-位点上的差异性结合,分别促进了O-H键裂解和1.73V的水电解.
结论:
- Co85Mo15/NF有效地降低了通过调制金属中心的中性水解离的能量屏障.
- 催化剂在各种pH条件下表现出极好的HER活性,与相似.
- 这种材料为电化学水分裂提供了一个有前途,高效和潜在的成本效益的替代品.
相关概念视频
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
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
Catalysis
26.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
26.9K
Electrodeposition
633
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...
633
Hydrogen Bonds
8.4K
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...
8.4K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.7K


![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)