高效的氧化氧化为氧化物交换膜燃料电池,由五倍结合的纳米粒子催化
Pin Meng1, Yang Yang1, Jiahe Yang1
1Hefei National Research Center for Physical Sciences at the Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
五倍结合的纳米颗粒使得和基结合能的独立调节成为增强的氧化反应 (HOR) 催化. 这一突破为商业化金组无金属燃料电池提供了有前途的途径.
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
- 催化剂是一种催化剂.
背景情况:
- 优化 (Ni) 电子结构对于氧化反应 (HOR) 催化至关重要.
- 使用Hammer-Nørskov d-band模型的常规方法同步结能 (HBE) 和结能 (OHBE) 调节.
- 需要HBE和OHBE的独立调,以获得卓越的催化性能.
研究的目的:
- 开发一种新的催化剂,用于HBE和OHBE的独立监管.
- 为了提高基电催化剂的催化活性和效率,用于HOR.
- 推进无金组金属氧化物交换膜燃料电池 (HEMFCs) 的商业化.
主要方法:
- 合成五倍双胞胎的超微小Ni纳米粒子.
- 催化剂属性的实验性表征.
- 理论计算 (例如,DFT) 来理解应变效应和结合能.
- 在HEMFC中进行电化学测试.
主要成果:
- 五倍生Ni纳米粒子通过应变效应实现HBE和OHBE的独立调整.
- 在双边界附近的拉伸应变增强了OHBE,并允许可调节的HBE.
- 实现了高动力电流密度 (jk,m) 106.6 mA mgNi-1 ,比Ni/C高24.2倍.
- 在HEMFC中展示了805mWcm-2的峰值功率密度 (PPD),这是基于Ni的电催化剂中最高的.
- 显示出出色的长期循环稳定性.
结论:
- 催化剂设计通过精确控制中间结合能,实现了前所未有的HOR活动.
- 这项工作代表了向无PGMHEMFC商业化迈出的重大进展.
- 在五倍双胞胎纳米颗粒的压力工程是设计高性能电催化剂的可行策略.
更多相关视频
06:39Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
Published on: October 20, 2023
09:18Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
Published on: June 21, 2017
相关概念视频
Catalysis
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...
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...
Batteries and Fuel Cells
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.
