Ni17W3@W的核心外结构诱导了性氧化的高内在活性和稳定性
Yunlong Zhang1, Yang Yang1, Pin Meng1
1Hefei National Research Center for Physical Sciences at the Microscale and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
一种新型的-芯外催化剂 (Ni17W3@W) 显著提高了交换膜燃料电池 (AEMFC) 中的氧化动力学. 这种无PGM的催化剂提供了卓越的活性,碳排放耐受性和耐用性,降低了AEMFC成本.
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
- 能源转换 能源转换
背景情况:
- 能提供零排放,但在离子交换膜燃料电池 (AEMFC) 中面临挑战.
- 在AEMFC中缓慢的阳极动力学需要昂贵的组金属 (PGM) 催化剂.
- 高PGM负载显著增加了AEMFC系统的整体成本.
研究的目的:
- 为AEMFCs开发一个具有成本效益的,高性能的非PGM阳极催化剂.
- 为了研究一种基于的新型电催化剂,具有核心外结构.
- 在AEMFC中增强氧化反应 (HOR) 动力学和耐久性.
主要方法:
- 一个-的核心外电催化剂 (Ni17W3@W) 的合成.
- 电化学表征包括电化学表面积-规范交换电流密度测量.
- 光谱分析:X射线吸收光谱 (XAS),紫外线光电子光谱 (UPS) 和现场表面增强红外吸收光谱 (SEIRAS).
主要成果:
- 与商业Pt/C相比,Ni17W3@W表现出卓越的内在活性 (0.072 mA cmNi−2) 和更高的CO耐受性.
- 光谱学研究显示了Ni价值状态的增加,d频段中心的向下移动,以及结合能量的减少.
- W外优化了界面水结构,并保护了Ni17W3核心,确保了长期稳定性.
结论:
- Ni17W3@W核心外催化剂在AEMFC中显示了氧化反应的高性能.
- 这种无PGM催化剂为昂贵的PGM催化剂提供了有希望的替代品,降低了系统成本.
- 该研究为设计高效燃料电池应用的先进非PGM阳极催化剂提供了洞察力.
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
07:57Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
Published on: August 18, 2023
相关概念视频
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...
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkali Metals
Table 1: Properties of the alkali metals
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.
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...
