在单一物质中实现离子-离子双重活性位点,以实现的进化
Pengyan Wang1, Chengmei Ding1, Zubing Huang1
1School of Energy and Electrical Engineering, Qinghai University, Xining 810016, China.
研究人员使用NiS2-NiS基质在酸 (Ni2P) 中激活了双 (Ni) 和 (P) 位点. 这为进化创造了高度活跃的电催化剂,与贵金属性能相匹配.
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:
- 单位催化剂通常限制演化反应 (HER) 活动,因为金属和非金属位点动力学不同.
- 化 (Ni2P) 通常作为单一活性点催化剂起作用.
研究的目的:
- 在Ni2P中同时激活阳离子 (P) 和阴离子 (Ni) 位点.
- 通过创建协同作用的双重活性位点来增强 HER 的电催化活性.
- 研究NiS2-NiS异质结构作为激活Ni2P的基质的作用.
主要方法:
- 在NiS2-NiS异质结构上支持Ni2P电催化剂的制造.
- 在现场拉曼光谱检测催化剂的电子结构.
- 密度函数理论 (DFT) 计算以了解反应机制和电荷分布.
主要成果:
- NiS2-NiS基板有效调节电荷分布,将其集中在P原子周围.
- 产生了协同作用的Ni和P双活性位点,促进了水吸附,解离和H*吸附.
- 由此产生的Ni2P/NiS2-NiS电催化剂在性介质中在10 mA cm-2时达到75 mV的低超电位.
结论:
- 通过基质工程同时激活阳离子和阴离子位点是提高电催化剂性能的可行策略.
- NiS2-NiS基质在为高效的HER创建双活性位点方面发挥着关键作用.
- 这种方法为开发基于单金属/金属间化合物的高性能电催化剂提供了一条途径.
更多相关视频
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
06:32A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
Published on: August 17, 2016
相关概念视频
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
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...
Reduction of Alkenes: 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...
Catalysis
Chemiosmosis
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Ion Exchange
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
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.
